Extracting prog: 2m15.966382094s
Minimizing prog: 3m0.677035913s
Simplifying prog options: 7m30.555279182s
Extracting C: 1m54.17215682s
Simplifying C: 9m53.86964899s


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:namespace 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_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x34, &(0x7f00000006c0)={{0x12, 0x1, 0x0, 0xfa, 0xbf, 0x52, 0x40, 0x2040, 0x26d, 0x576a, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x22, 0x1, 0x0, 0x0, 0x0, 0x0, [{{0x9, 0x4, 0xf4, 0x0, 0x1, 0x68, 0xe5, 0x1e, 0x0, [], [{{0x9, 0x5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7d, [@generic={0x7, 0x5, "839935191f"}]}}]}}]}}]}}, 0x0)

program crashed: BUG: corrupted list in em28xx_close_extension
single: successfully extracted reproducer
found reproducer with 1 syscalls
minimizing guilty program
testing program (duration=47.329782879s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace 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_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x0, 0x0, 0x0)

program did not crash
testing program (duration=47.329782879s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace 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_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x2f, &(0x7f00000006c0)={{0x12, 0x1, 0x0, 0xfa, 0xbf, 0x52, 0x40, 0x2040, 0x26d, 0x576a, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x1d, 0x1, 0x0, 0x0, 0x0, 0x0, [{{0x9, 0x4, 0xf4, 0x0, 0x1, 0x68, 0xe5, 0x1e, 0x0, [], [{{0x9, 0x5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7d, [@generic={0x2, 0x5}]}}]}}]}}]}}, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=47.329782879s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace 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_usb_connect
program crashed: KASAN: slab-use-after-free Read in em28xx_close_extension
a never seen crash title: KASAN: slab-use-after-free Read in em28xx_close_extension, ignore
simplifying guilty program options
testing program (duration=47.329782879s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace 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_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x34, &(0x7f00000006c0)={{0x12, 0x1, 0x0, 0xfa, 0xbf, 0x52, 0x40, 0x2040, 0x26d, 0x576a, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x22, 0x1, 0x0, 0x0, 0x0, 0x0, [{{0x9, 0x4, 0xf4, 0x0, 0x1, 0x68, 0xe5, 0x1e, 0x0, [], [{{0x9, 0x5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7d, [@generic={0x7, 0x5, "839935191f"}]}}]}}]}}]}}, 0x0)

program crashed: KASAN: slab-use-after-free Read in em28xx_init_extension
a never seen crash title: KASAN: slab-use-after-free Read in em28xx_init_extension, ignore
testing program (duration=47.329782879s, {Threaded:true Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:namespace 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}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x34, &(0x7f00000006c0)={{0x12, 0x1, 0x0, 0xfa, 0xbf, 0x52, 0x40, 0x2040, 0x26d, 0x576a, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x22, 0x1, 0x0, 0x0, 0x0, 0x0, [{{0x9, 0x4, 0xf4, 0x0, 0x1, 0x68, 0xe5, 0x1e, 0x0, [], [{{0x9, 0x5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7d, [@generic={0x7, 0x5, "839935191f"}]}}]}}]}}]}}, 0x0)

program did not crash
testing program (duration=47.329782879s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:namespace 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_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x34, &(0x7f00000006c0)={{0x12, 0x1, 0x0, 0xfa, 0xbf, 0x52, 0x40, 0x2040, 0x26d, 0x576a, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x22, 0x1, 0x0, 0x0, 0x0, 0x0, [{{0x9, 0x4, 0xf4, 0x0, 0x1, 0x68, 0xe5, 0x1e, 0x0, [], [{{0x9, 0x5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7d, [@generic={0x7, 0x5, "839935191f"}]}}]}}]}}]}}, 0x0)

program crashed: BUG: corrupted list in em28xx_init_extension
a never seen crash title: BUG: corrupted list in em28xx_init_extension, ignore
testing program (duration=47.329782879s, {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_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x34, &(0x7f00000006c0)={{0x12, 0x1, 0x0, 0xfa, 0xbf, 0x52, 0x40, 0x2040, 0x26d, 0x576a, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x22, 0x1, 0x0, 0x0, 0x0, 0x0, [{{0x9, 0x4, 0xf4, 0x0, 0x1, 0x68, 0xe5, 0x1e, 0x0, [], [{{0x9, 0x5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7d, [@generic={0x7, 0x5, "839935191f"}]}}]}}]}}]}}, 0x0)

program crashed: BUG: corrupted list in em28xx_close_extension
extracting C reproducer
testing compiled C program (duration=47.329782879s, {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_usb_connect
program crashed: BUG: corrupted list in em28xx_close_extension
simplifying C reproducer
testing compiled C program (duration=47.329782879s, {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}}): syz_usb_connect
program crashed: KASAN: slab-use-after-free Read in em28xx_close_extension
a never seen crash title: KASAN: slab-use-after-free Read in em28xx_close_extension, ignore
testing compiled C program (duration=47.329782879s, {Threaded:true 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}}): syz_usb_connect
program did not crash
testing compiled C program (duration=47.329782879s, {Threaded:true 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}}): syz_usb_connect
program crashed: BUG: corrupted list in em28xx_init_extension
a never seen crash title: BUG: corrupted list in em28xx_init_extension, ignore
testing compiled C program (duration=47.329782879s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): syz_usb_connect
program crashed: BUG: corrupted list in em28xx_close_extension
testing compiled C program (duration=47.329782879s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): syz_usb_connect
program crashed: KASAN: slab-out-of-bounds Read in em28xx_close_extension
a never seen crash title: KASAN: slab-out-of-bounds Read in em28xx_close_extension, ignore
testing compiled C program (duration=47.329782879s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
program crashed: KASAN: use-after-free Read in em28xx_close_extension
a never seen crash title: KASAN: use-after-free Read in em28xx_close_extension, ignore
testing compiled C program (duration=47.329782879s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
program crashed: BUG: corrupted list in em28xx_close_extension
testing compiled C program (duration=47.329782879s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Swap:false UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
program crashed: BUG: corrupted list in em28xx_close_extension
testing program (duration=47.329782879s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Swap:false UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x34, &(0x7f00000006c0)={{0x12, 0x1, 0x0, 0xfa, 0xbf, 0x52, 0x40, 0x2040, 0x26d, 0x576a, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x22, 0x1, 0x0, 0x0, 0x0, 0x0, [{{0x9, 0x4, 0xf4, 0x0, 0x1, 0x68, 0xe5, 0x1e, 0x0, [], [{{0x9, 0x5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7d, [@generic={0x7, 0x5, "839935191f"}]}}]}}]}}]}}, 0x0)

program crashed: BUG: corrupted list in em28xx_close_extension
validation run: crashed=true
testing program (duration=47.329782879s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Swap:false UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x34, &(0x7f00000006c0)={{0x12, 0x1, 0x0, 0xfa, 0xbf, 0x52, 0x40, 0x2040, 0x26d, 0x576a, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x22, 0x1, 0x0, 0x0, 0x0, 0x0, [{{0x9, 0x4, 0xf4, 0x0, 0x1, 0x68, 0xe5, 0x1e, 0x0, [], [{{0x9, 0x5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7d, [@generic={0x7, 0x5, "839935191f"}]}}]}}]}}]}}, 0x0)

program crashed: KASAN: use-after-free Read in em28xx_close_extension
validation run: crashed=true
testing program (duration=47.329782879s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Swap:false UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect
detailed listing:
executing program 0:
syz_usb_connect(0x0, 0x34, &(0x7f00000006c0)={{0x12, 0x1, 0x0, 0xfa, 0xbf, 0x52, 0x40, 0x2040, 0x26d, 0x576a, 0x1, 0x2, 0x3, 0x1, [{{0x9, 0x2, 0x22, 0x1, 0x0, 0x0, 0x0, 0x0, [{{0x9, 0x4, 0xf4, 0x0, 0x1, 0x68, 0xe5, 0x1e, 0x0, [], [{{0x9, 0x5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7d, [@generic={0x7, 0x5, "839935191f"}]}}]}}]}}]}}, 0x0)

program crashed: KASAN: use-after-free Read in em28xx_init_extension
validation run: crashed=true
reproducing took 28m10.097420636s
repro crashed as (corrupted=false):
em28xx 3-1:0.244: Config register raw data: 0xfffffffb
em28xx 3-1:0.244: AC97 chip type couldn't be determined
em28xx 3-1:0.244: No AC97 audio processor
==================================================================
BUG: KASAN: use-after-free in __list_add_valid_or_report+0x6a/0x130 lib/list_debug.c:32
Read of size 8 at addr ffff888063cb0250 by task kworker/0:2/89

CPU: 0 UID: 0 PID: 89 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 __list_add_valid_or_report+0x6a/0x130 lib/list_debug.c:32
 __list_add_valid include/linux/list.h:96 [inline]
 __list_add include/linux/list.h:158 [inline]
 list_add_tail include/linux/list.h:191 [inline]
 em28xx_init_extension+0x56/0x1c0 drivers/media/usb/em28xx/em28xx-core.c:1114
 em28xx_init_dev+0x9bd/0x20b0 drivers/media/usb/em28xx/em28xx-cards.c:3679
 em28xx_usb_probe+0x14e9/0x2a20 drivers/media/usb/em28xx/em28xx-cards.c:4034
 usb_probe_interface+0x668/0xc30 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26d/0x9e0 drivers/base/dd.c:659
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2b8/0x400 drivers/base/dd.c:1031
 bus_probe_device+0x185/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3689
 usb_set_configuration+0x1a87/0x20e0 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
 usb_probe_device+0x1c4/0x390 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26d/0x9e0 drivers/base/dd.c:659
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2b8/0x400 drivers/base/dd.c:1031
 bus_probe_device+0x185/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3689
 usb_new_device+0xa39/0x16f0 drivers/usb/core/hub.c:2694
 hub_port_connect drivers/usb/core/hub.c:5566 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x2958/0x4a20 drivers/usb/core/hub.c:5952
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888063cb0000 pfn:0x63cb0
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001f0c108 ffffea000150f908 0000000000000000
raw: ffff888063cb0000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x40cc0(GFP_KERNEL|__GFP_COMP), pid 5861, tgid 5861 (kworker/0:4), ts 96953271017, free_ts 97686167728
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 ___kmalloc_large_node+0x5f/0x1b0 mm/slub.c:5591
 __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:5622
 __do_kmalloc_node mm/slub.c:5638 [inline]
 __kmalloc_node_track_caller_noprof+0x133/0x800 mm/slub.c:5759
 kmemdup_noprof+0x2b/0x70 mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:765 [inline]
 em28xx_duplicate_dev+0x2e/0x200 drivers/media/usb/em28xx/em28xx-cards.c:3732
 em28xx_usb_probe+0x171b/0x2a20 drivers/media/usb/em28xx/em28xx-cards.c:4082
 usb_probe_interface+0x668/0xc30 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26d/0x9e0 drivers/base/dd.c:659
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
page last free pid 5861 tgid 5861 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 free_large_kmalloc+0x13a/0x1f0 mm/slub.c:6775
 kref_put include/linux/kref.h:65 [inline]
 em28xx_usb_disconnect+0x27f/0x2f0 drivers/media/usb/em28xx/em28xx-cards.c:4204
 usb_unbind_interface+0x26e/0x910 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:571 [inline]
 __device_release_driver drivers/base/dd.c:1274 [inline]
 device_release_driver_internal+0x4d9/0x800 drivers/base/dd.c:1297
 bus_remove_device+0x34d/0x410 drivers/base/bus.c:579
 device_del+0x511/0x8e0 drivers/base/core.c:3878
 usb_disable_device+0x3e9/0x8a0 drivers/usb/core/message.c:1418
 usb_disconnect+0x330/0x950 drivers/usb/core/hub.c:2344
 hub_port_connect drivers/usb/core/hub.c:5406 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x1cf5/0x4a20 drivers/usb/core/hub.c:5952
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888063cb0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888063cb0180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888063cb0200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                 ^
 ffff888063cb0280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888063cb0300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

final repro crashed as (corrupted=false):
em28xx 3-1:0.244: Config register raw data: 0xfffffffb
em28xx 3-1:0.244: AC97 chip type couldn't be determined
em28xx 3-1:0.244: No AC97 audio processor
==================================================================
BUG: KASAN: use-after-free in __list_add_valid_or_report+0x6a/0x130 lib/list_debug.c:32
Read of size 8 at addr ffff888063cb0250 by task kworker/0:2/89

CPU: 0 UID: 0 PID: 89 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 __list_add_valid_or_report+0x6a/0x130 lib/list_debug.c:32
 __list_add_valid include/linux/list.h:96 [inline]
 __list_add include/linux/list.h:158 [inline]
 list_add_tail include/linux/list.h:191 [inline]
 em28xx_init_extension+0x56/0x1c0 drivers/media/usb/em28xx/em28xx-core.c:1114
 em28xx_init_dev+0x9bd/0x20b0 drivers/media/usb/em28xx/em28xx-cards.c:3679
 em28xx_usb_probe+0x14e9/0x2a20 drivers/media/usb/em28xx/em28xx-cards.c:4034
 usb_probe_interface+0x668/0xc30 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26d/0x9e0 drivers/base/dd.c:659
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2b8/0x400 drivers/base/dd.c:1031
 bus_probe_device+0x185/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3689
 usb_set_configuration+0x1a87/0x20e0 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
 usb_probe_device+0x1c4/0x390 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26d/0x9e0 drivers/base/dd.c:659
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2b8/0x400 drivers/base/dd.c:1031
 bus_probe_device+0x185/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3689
 usb_new_device+0xa39/0x16f0 drivers/usb/core/hub.c:2694
 hub_port_connect drivers/usb/core/hub.c:5566 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x2958/0x4a20 drivers/usb/core/hub.c:5952
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888063cb0000 pfn:0x63cb0
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001f0c108 ffffea000150f908 0000000000000000
raw: ffff888063cb0000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x40cc0(GFP_KERNEL|__GFP_COMP), pid 5861, tgid 5861 (kworker/0:4), ts 96953271017, free_ts 97686167728
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 ___kmalloc_large_node+0x5f/0x1b0 mm/slub.c:5591
 __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:5622
 __do_kmalloc_node mm/slub.c:5638 [inline]
 __kmalloc_node_track_caller_noprof+0x133/0x800 mm/slub.c:5759
 kmemdup_noprof+0x2b/0x70 mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:765 [inline]
 em28xx_duplicate_dev+0x2e/0x200 drivers/media/usb/em28xx/em28xx-cards.c:3732
 em28xx_usb_probe+0x171b/0x2a20 drivers/media/usb/em28xx/em28xx-cards.c:4082
 usb_probe_interface+0x668/0xc30 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26d/0x9e0 drivers/base/dd.c:659
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
page last free pid 5861 tgid 5861 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 free_large_kmalloc+0x13a/0x1f0 mm/slub.c:6775
 kref_put include/linux/kref.h:65 [inline]
 em28xx_usb_disconnect+0x27f/0x2f0 drivers/media/usb/em28xx/em28xx-cards.c:4204
 usb_unbind_interface+0x26e/0x910 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:571 [inline]
 __device_release_driver drivers/base/dd.c:1274 [inline]
 device_release_driver_internal+0x4d9/0x800 drivers/base/dd.c:1297
 bus_remove_device+0x34d/0x410 drivers/base/bus.c:579
 device_del+0x511/0x8e0 drivers/base/core.c:3878
 usb_disable_device+0x3e9/0x8a0 drivers/usb/core/message.c:1418
 usb_disconnect+0x330/0x950 drivers/usb/core/hub.c:2344
 hub_port_connect drivers/usb/core/hub.c:5406 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x1cf5/0x4a20 drivers/usb/core/hub.c:5952
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888063cb0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888063cb0180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888063cb0200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                 ^
 ffff888063cb0280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888063cb0300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================