Extracting prog: 1m52.736906315s
Minimizing prog: 17m33.310102075s
Simplifying prog options: 0s
Extracting C: 48.815075299s
Simplifying C: 6m54.994403172s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program crashed: KASAN: slab-use-after-free Read in dvb_device_open
program crashed: KASAN: slab-use-after-free Read in dvb_device_open
single: successfully extracted reproducer
found reproducer with 7 syscalls
minimizing guilty program
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r0=>0x0, &(0x7f0000000140)=<r1=>0x0, &(0x7f0000000080)=<r2=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r3 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r0, r1, r2, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r3, 0x0, 0x0, 0x1, {0x2011}})
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0), &(0x7f0000000140), &(0x7f0000000080))
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r0 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(0x0, 0x0, 0x0, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r0, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(0xffffffffffffffff, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, 0x0, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, 0x0}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={0x0}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, 0x0, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, 0x0, &(0x7f0000000140)=<r1=>0x0, &(0x7f0000000080)=<r2=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r3 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(0x0, r1, r2, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r3, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, 0x0, &(0x7f0000000080)=<r2=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r3 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, 0x0, r2, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r3, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, 0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r3 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, 0x0, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r3, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, 0x0, 0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB], 0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, 0x0)
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program did not crash
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(0x0, 0x0, 0x40002)

program did not crash
extracting C reproducer
testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
program crashed: KASAN: slab-use-after-free Read in dvb_device_open
simplifying C reproducer
testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
program crashed: KASAN: slab-use-after-free Read in dvb_device_open
testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
program did not crash
testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
program crashed: KASAN: slab-use-after-free Read in dvb_device_open
testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
program crashed: KASAN: slab-use-after-free Read in dvb_device_open
testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
program crashed: KASAN: slab-use-after-free Read in dvb_device_open
testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
program crashed: KASAN: slab-use-after-free Read in dvb_device_open
testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
program crashed: KASAN: slab-use-after-free Read in dvb_device_open
testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
program crashed: KASAN: slab-use-after-free Read in dvb_device_open
testing program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program crashed: KASAN: slab-use-after-free Read in dvb_device_open
validation run: crashed=true
testing program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program crashed: KASAN: slab-use-after-free Read in dvb_device_open
validation run: crashed=true
testing program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$nl_route_sched-syz_io_uring_setup-syz_usb_connect-syz_open_dev$char_usb-syz_io_uring_submit-io_uring_enter-syz_open_dev$dvb_frontend
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000100)={&(0x7f0000000000)=@newqdisc={0x30, 0x24, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, {0x0, 0xffff}, {0xfff1, 0xffff}}, [@qdisc_kind_options=@q_ingress={0xc}]}, 0x30}}, 0x0)
r0 = syz_io_uring_setup(0xf00, &(0x7f0000000400)={0x0, 0x0, 0x10000, 0x1, 0x40055}, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0, &(0x7f0000000080)=<r3=>0x0)
syz_usb_connect(0x3, 0x2d, &(0x7f0000000000)=ANY=[@ANYBLOB="120100009ac0b620110f211066865578ac0109029c000100000400090400bf900b64ea0009058703"], 0x0)
r4 = syz_open_dev$char_usb(0xc, 0xb4, 0x10000)
syz_io_uring_submit(r1, r2, r3, &(0x7f0000000240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r4, 0x0, 0x0, 0x1, {0x2011}})
io_uring_enter(r0, 0x1000001, 0xfffffffd, 0x4b, 0x0, 0x0)
syz_open_dev$dvb_frontend(&(0x7f0000000000), 0x0, 0x40002)

program crashed: KASAN: slab-use-after-free Read in dvb_device_open
validation run: crashed=true
reproducing took 30m5.013727325s
repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: slab-use-after-free in dvb_device_open+0xd0/0x254 drivers/media/dvb-core/dvbdev.c:99
Read of size 8 at addr ffff0000cb84d618 by task syz.0.19/4933

CPU: 1 UID: 0 PID: 4933 Comm: syz.0.19 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xb0/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0x8c/0xc4 mm/kasan/report.c:595
 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381
 dvb_device_open+0xd0/0x254 drivers/media/dvb-core/dvbdev.c:99
 chrdev_open+0x398/0x3e8 fs/char_dev.c:411
 do_dentry_open+0x5c4/0xfbc fs/open.c:996
 vfs_open+0x44/0x2dc fs/open.c:1101
 do_open fs/namei.c:4837 [inline]
 path_openat+0x1084/0x18f0 fs/namei.c:5000
 do_file_open+0x1c8/0x2e8 fs/namei.c:5029
 do_sys_openat2+0x114/0x1e8 fs/open.c:1417
 do_sys_open+0xb0/0xe0 fs/open.c:1423
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606

Allocated by task 1:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:78
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:570
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x2f4/0x5fc mm/slub.c:5563
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 dvb_register_device+0x1a4/0x16e0 drivers/media/dvb-core/dvbdev.c:472
 dvb_register_frontend+0x474/0x6d0 drivers/media/dvb-core/dvb_frontend.c:3074
 vidtv_bridge_dvb_init drivers/media/test-drivers/vidtv/vidtv_bridge.c:438 [inline]
 vidtv_bridge_probe+0x5a4/0xa58 drivers/media/test-drivers/vidtv/vidtv_bridge.c:510
 platform_probe+0x100/0x1a4 drivers/base/platform.c:1507
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x29c/0x800 drivers/base/dd.c:706
 __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:868
 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898
 __driver_attach+0x168/0x384 drivers/base/dd.c:1292
 bus_for_each_dev+0x128/0x1b4 drivers/base/bus.c:383
 driver_attach+0x50/0x60 drivers/base/dd.c:1310
 bus_add_driver+0x208/0x500 drivers/base/bus.c:763
 driver_register+0x220/0x310 drivers/base/driver.c:174
 __platform_driver_register+0x90/0xa4 drivers/base/platform.c:995
 vidtv_bridge_init+0x4c/0x74 drivers/media/test-drivers/vidtv/vidtv_bridge.c:602
 do_one_initcall+0x274/0x9f8 init/main.c:1362
 do_initcall_level+0x12c/0x1c4 init/main.c:1424
 do_initcalls+0x70/0xd0 init/main.c:1440
 do_basic_setup+0x7c/0x90 init/main.c:1460
 kernel_init_freeable+0x258/0x398 init/main.c:1675
 kernel_init+0x28/0x1e0 init/main.c:1565
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854

Freed by task 4931:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:78
 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2748 [inline]
 slab_free mm/slub.c:6508 [inline]
 kfree+0x188/0x658 mm/slub.c:6801
 dvb_free_device drivers/media/dvb-core/dvbdev.c:616 [inline]
 kref_put include/linux/kref.h:65 [inline]
 dvb_device_put+0x64/0xd0 drivers/media/dvb-core/dvbdev.c:629
 dvb_device_open+0x23c/0x254 drivers/media/dvb-core/dvbdev.c:113
 chrdev_open+0x398/0x3e8 fs/char_dev.c:411
 do_dentry_open+0x5c4/0xfbc fs/open.c:996
 vfs_open+0x44/0x2dc fs/open.c:1101
 do_open fs/namei.c:4837 [inline]
 path_openat+0x1084/0x18f0 fs/namei.c:5000
 do_file_open+0x1c8/0x2e8 fs/namei.c:5029
 do_sys_openat2+0x114/0x1e8 fs/open.c:1417
 do_sys_open+0xb0/0xe0 fs/open.c:1423
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606

The buggy address belongs to the object at ffff0000cb84d600
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 24 bytes inside of
 freed 256-byte region [ffff0000cb84d600, ffff0000cb84d700)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b84c
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000040 ffff0000c0001b40 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 05ffc00000000040 ffff0000c0001b40 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 05ffc00000000001 fffffdffc32e1301 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000cb84d500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000cb84d580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000cb84d600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff0000cb84d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000cb84d700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: lib/refcount.c:25 at refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25, CPU#1: syz.0.19/4933
Modules linked in:
CPU: 1 UID: 0 PID: 4933 Comm: syz.0.19 Tainted: G    B               syzkaller #0 PREEMPT 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25
lr : refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25
sp : ffff800099ed7700
x29: ffff800099ed7700 x28: dfff800000000000 x27: 1fffe00019fc66e1
x26: dfff800000000000 x25: ffff7000133daef4 x24: dfff800000000000
x23: ffff8000873e24e8 x22: ffff0000cb014000 x21: ffff0000cb84d600
x20: ffff0000cb84d610 x19: ffff80008a0f0000 x18: 0000000000000000
x17: 3d3d3d3d3d3d3d3d x16: 3d3d3d3d3d3d3d3d x15: 3d3d3d3d3d3d3d3d
x14: 00000000000005da x13: 0000000000000001 x12: 0000000000000003
x11: 0000000000000000 x10: 0000000000000002 x9 : 2aaf62fd97dc7100
x8 : 2aaf62fd97dc7100 x7 : 0000000000000000 x6 : ffff800080483190
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f3e60
x2 : 0000000100000000 x1 : ffff0000c65f0000 x0 : 0000000000000000
Call trace:
 refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 (P)
 __refcount_add include/linux/refcount.h:-1 [inline]
 __refcount_inc include/linux/refcount.h:366 [inline]
 refcount_inc include/linux/refcount.h:383 [inline]
 kref_get include/linux/kref.h:45 [inline]
 dvb_device_get+0x9c/0xc0 drivers/media/dvb-core/dvbdev.c:621
 dvb_device_open+0x100/0x254 drivers/media/dvb-core/dvbdev.c:106
 chrdev_open+0x398/0x3e8 fs/char_dev.c:411
 do_dentry_open+0x5c4/0xfbc fs/open.c:996
 vfs_open+0x44/0x2dc fs/open.c:1101
 do_open fs/namei.c:4837 [inline]
 path_openat+0x1084/0x18f0 fs/namei.c:5000
 do_file_open+0x1c8/0x2e8 fs/namei.c:5029
 do_sys_openat2+0x114/0x1e8 fs/open.c:1417
 do_sys_open+0xb0/0xe0 fs/open.c:1423
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606
irq event stamp: 2063
hardirqs last  enabled at (2063): [<ffff80008686be60>] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline]
hardirqs last  enabled at (2063): [<ffff80008686be60>] __arm64_exit_to_kernel_mode+0x70/0xcc arch/arm64/kernel/entry-common.c:98
hardirqs last disabled at (2062): [<ffff80008030adbc>] handle_softirqs+0x9cc/0xcbc kernel/softirq.c:660
softirqs last  enabled at (2050): [<ffff80008030af1c>] softirq_handle_end kernel/softirq.c:491 [inline]
softirqs last  enabled at (2050): [<ffff80008030af1c>] handle_softirqs+0xb2c/0xcbc kernel/softirq.c:673
softirqs last disabled at (2041): [<ffff8000800203f0>] __do_softirq+0x14/0x20 kernel/softirq.c:679
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: lib/refcount.c:28 at refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28, CPU#1: syz.0.19/4933
Modules linked in:
CPU: 1 UID: 0 PID: 4933 Comm: syz.0.19 Tainted: G    B   W           syzkaller #0 PREEMPT 
Tainted: [B]=BAD_PAGE, [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28
lr : refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28
sp : ffff800099ed75b0
x29: ffff800099ed75b0 x28: ffff0000cae00800 x27: ffff0000cb84d600
x26: ffff0000cba99308 x25: dfff800000000000 x24: ffff0000cad84180
x23: 00000000fffffffc x22: 1fffe00019709ac7 x21: 00000000c0000000
x20: ffff0000cb84d610 x19: ffff80008a0f0000 x18: 0000000000000000
x17: 3d3d3d3d3d3d3d3d x16: 3d3d3d3d3d3d3d3d x15: 3d3d3d3d3d3d3d3d
x14: 0000000000000628 x13: 0000000000000001 x12: 0000000000000003
x11: 0000000000000000 x10: 0000000000000002 x9 : 2aaf62fd97dc7100
x8 : 2aaf62fd97dc7100 x7 : 0000000000000000 x6 : ffff800080483190
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f3e60
x2 : 0000000100000000 x1 : ffff0000c65f0000 x0 : 0000000000000000
Call trace:
 refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 (P)
 __refcount_sub_and_test include/linux/refcount.h:400 [inline]
 __refcount_dec_and_test include/linux/refcount.h:432 [inline]
 refcount_dec_and_test include/linux/refcount.h:450 [inline]
 kref_put include/linux/kref.h:64 [inline]
 dvb_device_put+0xac/0xd0 drivers/media/dvb-core/dvbdev.c:629
 dvb_generic_release+0xec/0x158 drivers/media/dvb-core/dvbdev.c:169
 __dvb_frontend_open+0x5c4/0xa34 drivers/media/dvb-core/dvb_frontend.c:2837
 dvb_frontend_open+0x19c/0x70c drivers/media/dvb-core/dvb_frontend.c:2884
 dvb_device_open+0x1f8/0x254 drivers/media/dvb-core/dvbdev.c:109
 chrdev_open+0x398/0x3e8 fs/char_dev.c:411
 do_dentry_open+0x5c4/0xfbc fs/open.c:996
 vfs_open+0x44/0x2dc fs/open.c:1101
 do_open fs/namei.c:4837 [inline]
 path_openat+0x1084/0x18f0 fs/namei.c:5000
 do_file_open+0x1c8/0x2e8 fs/namei.c:5029
 do_sys_openat2+0x114/0x1e8 fs/open.c:1417
 do_sys_open+0xb0/0xe0 fs/open.c:1423
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606
irq event stamp: 2063
hardirqs last  enabled at (2063): [<ffff80008686be60>] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline]
hardirqs last  enabled at (2063): [<ffff80008686be60>] __arm64_exit_to_kernel_mode+0x70/0xcc arch/arm64/kernel/entry-common.c:98
hardirqs last disabled at (2062): [<ffff80008030adbc>] handle_softirqs+0x9cc/0xcbc kernel/softirq.c:660
softirqs last  enabled at (2050): [<ffff80008030af1c>] softirq_handle_end kernel/softirq.c:491 [inline]
softirqs last  enabled at (2050): [<ffff80008030af1c>] handle_softirqs+0xb2c/0xcbc kernel/softirq.c:673
softirqs last disabled at (2041): [<ffff8000800203f0>] __do_softirq+0x14/0x20 kernel/softirq.c:679
---[ end trace 0000000000000000 ]---

final repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: slab-use-after-free in dvb_device_open+0xd0/0x254 drivers/media/dvb-core/dvbdev.c:99
Read of size 8 at addr ffff0000cb84d618 by task syz.0.19/4933

CPU: 1 UID: 0 PID: 4933 Comm: syz.0.19 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xb0/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0x8c/0xc4 mm/kasan/report.c:595
 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381
 dvb_device_open+0xd0/0x254 drivers/media/dvb-core/dvbdev.c:99
 chrdev_open+0x398/0x3e8 fs/char_dev.c:411
 do_dentry_open+0x5c4/0xfbc fs/open.c:996
 vfs_open+0x44/0x2dc fs/open.c:1101
 do_open fs/namei.c:4837 [inline]
 path_openat+0x1084/0x18f0 fs/namei.c:5000
 do_file_open+0x1c8/0x2e8 fs/namei.c:5029
 do_sys_openat2+0x114/0x1e8 fs/open.c:1417
 do_sys_open+0xb0/0xe0 fs/open.c:1423
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606

Allocated by task 1:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:78
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:570
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x2f4/0x5fc mm/slub.c:5563
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 dvb_register_device+0x1a4/0x16e0 drivers/media/dvb-core/dvbdev.c:472
 dvb_register_frontend+0x474/0x6d0 drivers/media/dvb-core/dvb_frontend.c:3074
 vidtv_bridge_dvb_init drivers/media/test-drivers/vidtv/vidtv_bridge.c:438 [inline]
 vidtv_bridge_probe+0x5a4/0xa58 drivers/media/test-drivers/vidtv/vidtv_bridge.c:510
 platform_probe+0x100/0x1a4 drivers/base/platform.c:1507
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x29c/0x800 drivers/base/dd.c:706
 __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:868
 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898
 __driver_attach+0x168/0x384 drivers/base/dd.c:1292
 bus_for_each_dev+0x128/0x1b4 drivers/base/bus.c:383
 driver_attach+0x50/0x60 drivers/base/dd.c:1310
 bus_add_driver+0x208/0x500 drivers/base/bus.c:763
 driver_register+0x220/0x310 drivers/base/driver.c:174
 __platform_driver_register+0x90/0xa4 drivers/base/platform.c:995
 vidtv_bridge_init+0x4c/0x74 drivers/media/test-drivers/vidtv/vidtv_bridge.c:602
 do_one_initcall+0x274/0x9f8 init/main.c:1362
 do_initcall_level+0x12c/0x1c4 init/main.c:1424
 do_initcalls+0x70/0xd0 init/main.c:1440
 do_basic_setup+0x7c/0x90 init/main.c:1460
 kernel_init_freeable+0x258/0x398 init/main.c:1675
 kernel_init+0x28/0x1e0 init/main.c:1565
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854

Freed by task 4931:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:78
 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2748 [inline]
 slab_free mm/slub.c:6508 [inline]
 kfree+0x188/0x658 mm/slub.c:6801
 dvb_free_device drivers/media/dvb-core/dvbdev.c:616 [inline]
 kref_put include/linux/kref.h:65 [inline]
 dvb_device_put+0x64/0xd0 drivers/media/dvb-core/dvbdev.c:629
 dvb_device_open+0x23c/0x254 drivers/media/dvb-core/dvbdev.c:113
 chrdev_open+0x398/0x3e8 fs/char_dev.c:411
 do_dentry_open+0x5c4/0xfbc fs/open.c:996
 vfs_open+0x44/0x2dc fs/open.c:1101
 do_open fs/namei.c:4837 [inline]
 path_openat+0x1084/0x18f0 fs/namei.c:5000
 do_file_open+0x1c8/0x2e8 fs/namei.c:5029
 do_sys_openat2+0x114/0x1e8 fs/open.c:1417
 do_sys_open+0xb0/0xe0 fs/open.c:1423
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606

The buggy address belongs to the object at ffff0000cb84d600
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 24 bytes inside of
 freed 256-byte region [ffff0000cb84d600, ffff0000cb84d700)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b84c
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000040 ffff0000c0001b40 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 05ffc00000000040 ffff0000c0001b40 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 05ffc00000000001 fffffdffc32e1301 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000cb84d500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000cb84d580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000cb84d600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff0000cb84d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000cb84d700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: lib/refcount.c:25 at refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25, CPU#1: syz.0.19/4933
Modules linked in:
CPU: 1 UID: 0 PID: 4933 Comm: syz.0.19 Tainted: G    B               syzkaller #0 PREEMPT 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25
lr : refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25
sp : ffff800099ed7700
x29: ffff800099ed7700 x28: dfff800000000000 x27: 1fffe00019fc66e1
x26: dfff800000000000 x25: ffff7000133daef4 x24: dfff800000000000
x23: ffff8000873e24e8 x22: ffff0000cb014000 x21: ffff0000cb84d600
x20: ffff0000cb84d610 x19: ffff80008a0f0000 x18: 0000000000000000
x17: 3d3d3d3d3d3d3d3d x16: 3d3d3d3d3d3d3d3d x15: 3d3d3d3d3d3d3d3d
x14: 00000000000005da x13: 0000000000000001 x12: 0000000000000003
x11: 0000000000000000 x10: 0000000000000002 x9 : 2aaf62fd97dc7100
x8 : 2aaf62fd97dc7100 x7 : 0000000000000000 x6 : ffff800080483190
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f3e60
x2 : 0000000100000000 x1 : ffff0000c65f0000 x0 : 0000000000000000
Call trace:
 refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 (P)
 __refcount_add include/linux/refcount.h:-1 [inline]
 __refcount_inc include/linux/refcount.h:366 [inline]
 refcount_inc include/linux/refcount.h:383 [inline]
 kref_get include/linux/kref.h:45 [inline]
 dvb_device_get+0x9c/0xc0 drivers/media/dvb-core/dvbdev.c:621
 dvb_device_open+0x100/0x254 drivers/media/dvb-core/dvbdev.c:106
 chrdev_open+0x398/0x3e8 fs/char_dev.c:411
 do_dentry_open+0x5c4/0xfbc fs/open.c:996
 vfs_open+0x44/0x2dc fs/open.c:1101
 do_open fs/namei.c:4837 [inline]
 path_openat+0x1084/0x18f0 fs/namei.c:5000
 do_file_open+0x1c8/0x2e8 fs/namei.c:5029
 do_sys_openat2+0x114/0x1e8 fs/open.c:1417
 do_sys_open+0xb0/0xe0 fs/open.c:1423
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606
irq event stamp: 2063
hardirqs last  enabled at (2063): [<ffff80008686be60>] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline]
hardirqs last  enabled at (2063): [<ffff80008686be60>] __arm64_exit_to_kernel_mode+0x70/0xcc arch/arm64/kernel/entry-common.c:98
hardirqs last disabled at (2062): [<ffff80008030adbc>] handle_softirqs+0x9cc/0xcbc kernel/softirq.c:660
softirqs last  enabled at (2050): [<ffff80008030af1c>] softirq_handle_end kernel/softirq.c:491 [inline]
softirqs last  enabled at (2050): [<ffff80008030af1c>] handle_softirqs+0xb2c/0xcbc kernel/softirq.c:673
softirqs last disabled at (2041): [<ffff8000800203f0>] __do_softirq+0x14/0x20 kernel/softirq.c:679
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: lib/refcount.c:28 at refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28, CPU#1: syz.0.19/4933
Modules linked in:
CPU: 1 UID: 0 PID: 4933 Comm: syz.0.19 Tainted: G    B   W           syzkaller #0 PREEMPT 
Tainted: [B]=BAD_PAGE, [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28
lr : refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28
sp : ffff800099ed75b0
x29: ffff800099ed75b0 x28: ffff0000cae00800 x27: ffff0000cb84d600
x26: ffff0000cba99308 x25: dfff800000000000 x24: ffff0000cad84180
x23: 00000000fffffffc x22: 1fffe00019709ac7 x21: 00000000c0000000
x20: ffff0000cb84d610 x19: ffff80008a0f0000 x18: 0000000000000000
x17: 3d3d3d3d3d3d3d3d x16: 3d3d3d3d3d3d3d3d x15: 3d3d3d3d3d3d3d3d
x14: 0000000000000628 x13: 0000000000000001 x12: 0000000000000003
x11: 0000000000000000 x10: 0000000000000002 x9 : 2aaf62fd97dc7100
x8 : 2aaf62fd97dc7100 x7 : 0000000000000000 x6 : ffff800080483190
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f3e60
x2 : 0000000100000000 x1 : ffff0000c65f0000 x0 : 0000000000000000
Call trace:
 refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 (P)
 __refcount_sub_and_test include/linux/refcount.h:400 [inline]
 __refcount_dec_and_test include/linux/refcount.h:432 [inline]
 refcount_dec_and_test include/linux/refcount.h:450 [inline]
 kref_put include/linux/kref.h:64 [inline]
 dvb_device_put+0xac/0xd0 drivers/media/dvb-core/dvbdev.c:629
 dvb_generic_release+0xec/0x158 drivers/media/dvb-core/dvbdev.c:169
 __dvb_frontend_open+0x5c4/0xa34 drivers/media/dvb-core/dvb_frontend.c:2837
 dvb_frontend_open+0x19c/0x70c drivers/media/dvb-core/dvb_frontend.c:2884
 dvb_device_open+0x1f8/0x254 drivers/media/dvb-core/dvbdev.c:109
 chrdev_open+0x398/0x3e8 fs/char_dev.c:411
 do_dentry_open+0x5c4/0xfbc fs/open.c:996
 vfs_open+0x44/0x2dc fs/open.c:1101
 do_open fs/namei.c:4837 [inline]
 path_openat+0x1084/0x18f0 fs/namei.c:5000
 do_file_open+0x1c8/0x2e8 fs/namei.c:5029
 do_sys_openat2+0x114/0x1e8 fs/open.c:1417
 do_sys_open+0xb0/0xe0 fs/open.c:1423
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606
irq event stamp: 2063
hardirqs last  enabled at (2063): [<ffff80008686be60>] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline]
hardirqs last  enabled at (2063): [<ffff80008686be60>] __arm64_exit_to_kernel_mode+0x70/0xcc arch/arm64/kernel/entry-common.c:98
hardirqs last disabled at (2062): [<ffff80008030adbc>] handle_softirqs+0x9cc/0xcbc kernel/softirq.c:660
softirqs last  enabled at (2050): [<ffff80008030af1c>] softirq_handle_end kernel/softirq.c:491 [inline]
softirqs last  enabled at (2050): [<ffff80008030af1c>] handle_softirqs+0xb2c/0xcbc kernel/softirq.c:673
softirqs last disabled at (2041): [<ffff8000800203f0>] __do_softirq+0x14/0x20 kernel/softirq.c:679
---[ end trace 0000000000000000 ]---