Extracting prog: 1m32.989055654s
Minimizing prog: 28m12.585853888s
Simplifying prog options: 5m38.045797982s
Extracting C: 2m24.058941384s
Simplifying C: 0s


extracting reproducer from 77 programs
first checking the prog from the crash report
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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mmap-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs-ioctl$KVM_SET_USER_MEMORY_REGION-openat$nullb-madvise-fadvise64
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
r1 = dup(r0)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x1000007, 0x38011, r1, 0x2c9ab000)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
r2 = bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c, r2}, 0x38)
r3 = syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')
ioctl$KVM_SET_USER_MEMORY_REGION(r3, 0xc0686611, &(0x7f0000000180)={0x68, 0x0, 0x17, 0x2000, &(0x7f0000ffd000/0x2000)=nil})
r4 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
madvise(&(0x7f0000000000/0xc00000)=nil, 0xc00304, 0x15)
fadvise64(r4, 0x18, 0x0, 0x4)

program crashed: WARNING: suspicious RCU usage in proc_sys_compare
single: successfully extracted reproducer
found reproducer with 11 syscalls
minimizing guilty program
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mmap-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs-ioctl$KVM_SET_USER_MEMORY_REGION-openat$nullb-madvise
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
r1 = dup(r0)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x1000007, 0x38011, r1, 0x2c9ab000)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
r2 = bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c, r2}, 0x38)
r3 = syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')
ioctl$KVM_SET_USER_MEMORY_REGION(r3, 0xc0686611, &(0x7f0000000180)={0x68, 0x0, 0x17, 0x2000, &(0x7f0000ffd000/0x2000)=nil})
openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
madvise(&(0x7f0000000000/0xc00000)=nil, 0xc00304, 0x15)

program crashed: BUG: sleeping function called from invalid context in freader_get_folio
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mmap-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs-ioctl$KVM_SET_USER_MEMORY_REGION-openat$nullb
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
r1 = dup(r0)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x1000007, 0x38011, r1, 0x2c9ab000)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
r2 = bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c, r2}, 0x38)
r3 = syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')
ioctl$KVM_SET_USER_MEMORY_REGION(r3, 0xc0686611, &(0x7f0000000180)={0x68, 0x0, 0x17, 0x2000, &(0x7f0000ffd000/0x2000)=nil})
openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)

program crashed: BUG: sleeping function called from invalid context in freader_get_folio
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mmap-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs-ioctl$KVM_SET_USER_MEMORY_REGION
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
r1 = dup(r0)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x1000007, 0x38011, r1, 0x2c9ab000)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
r2 = bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c, r2}, 0x38)
r3 = syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')
ioctl$KVM_SET_USER_MEMORY_REGION(r3, 0xc0686611, &(0x7f0000000180)={0x68, 0x0, 0x17, 0x2000, &(0x7f0000ffd000/0x2000)=nil})

program crashed: BUG: sleeping function called from invalid context in freader_get_folio
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mmap-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
r1 = dup(r0)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x1000007, 0x38011, r1, 0x2c9ab000)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
r2 = bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c, r2}, 0x38)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program crashed: WARNING: suspicious RCU usage in proc_sys_compare
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mmap-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
r1 = dup(r0)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x1000007, 0x38011, r1, 0x2c9ab000)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
r2 = bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c, r2}, 0x38)

program did not crash
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mmap-mount$9p_fd-bpf$MAP_CREATE-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
r1 = dup(r0)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x1000007, 0x38011, r1, 0x2c9ab000)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mmap-mount$9p_fd-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
r1 = dup(r0)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x1000007, 0x38011, r1, 0x2c9ab000)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c}, 0x38)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mmap-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
r1 = dup(r0)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x1000007, 0x38011, r1, 0x2c9ab000)
r2 = bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c, r2}, 0x38)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
r1 = bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c, r1}, 0x38)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program crashed: WARNING: suspicious RCU usage in proc_sys_compare
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
r0 = bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c, r0}, 0x38)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
dup(0xffffffffffffffff)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
r0 = bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c, r0}, 0x38)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, 0x0, 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
r1 = bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c, r1}, 0x38)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, 0x0)
r1 = bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c, r1}, 0x38)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
r1 = bpf$MAP_CREATE(0x0, 0x0, 0x0)
bpf$MAP_LOOKUP_BATCH(0x18, &(0x7f00000003c0)={0x0, 0x0, &(0x7f0000000000), &(0x7f0000000200), 0xa7c, r1}, 0x38)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program crashed: WARNING: suspicious RCU usage in proc_sys_compare
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
program did not crash
simplifying guilty program options
testing program (duration=45.842158864s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program crashed: WARNING: suspicious RCU usage in proc_sys_compare
extracting C reproducer
testing compiled C program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
program did not crash
testing program (duration=45.842158864s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
validation run: crashed=false
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
validation run: crashed=false
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
validation run: crashed=false
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program crashed: WARNING: suspicious RCU usage in proc_sys_compare
validation run: crashed=true
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program crashed: WARNING: suspicious RCU usage in proc_sys_compare
validation run: crashed=true
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
validation run: crashed=false
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
validation run: crashed=false
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
validation run: crashed=false
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
validation run: crashed=false
testing program (duration=45.842158864s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$nullb-dup-mount$9p_fd-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-syz_open_procfs
detailed listing:
executing program 0:
r0 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000080), 0x4000000004002, 0x0)
dup(r0)
mount$9p_fd(0x0, 0x0, 0x0, 0x0, &(0x7f0000000140))
bpf$MAP_CREATE(0x0, &(0x7f0000000080)=@base={0x2, 0x4, 0x6, 0x504}, 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
syz_open_procfs(0x0, &(0x7f00000001c0)='maps\x00')

program did not crash
validation run: crashed=false
reproducing took 52m35.417264558s
repro crashed as (corrupted=false):
=============================
WARNING: suspicious RCU usage
6.16.0-rc4-next-20250704-syzkaller #0 Not tainted
-----------------------------
fs/proc/proc_sysctl.c:934 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz-executor/5861:
 #0: ffff88803517a428 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
 #1: ffff888031624190 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:884 [inline]
 #1: ffff888031624190 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: open_last_lookups fs/namei.c:3806 [inline]
 #1: ffff888031624190 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: path_openat+0x8cb/0x3830 fs/namei.c:4043
 #2: ffff88807399f0f8 (&lockref->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #2: ffff88807399f0f8 (&lockref->lock){+.+.}-{3:3}, at: d_wait_lookup fs/dcache.c:2537 [inline]
 #2: ffff88807399f0f8 (&lockref->lock){+.+.}-{3:3}, at: d_alloc_parallel+0xbe4/0x15e0 fs/dcache.c:2624

stack backtrace:
CPU: 1 UID: 0 PID: 5861 Comm: syz-executor Not tainted 6.16.0-rc4-next-20250704-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6871
 proc_sys_compare+0x27d/0x2c0 fs/proc/proc_sysctl.c:934
 d_same_name fs/dcache.c:2179 [inline]
 d_alloc_parallel+0x1060/0x15e0 fs/dcache.c:2637
 lookup_open fs/namei.c:3630 [inline]
 open_last_lookups fs/namei.c:3807 [inline]
 path_openat+0xa3b/0x3830 fs/namei.c:4043
 do_filp_open+0x1fa/0x410 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1434
 do_sys_open fs/open.c:1449 [inline]
 __do_sys_openat fs/open.c:1465 [inline]
 __se_sys_openat fs/open.c:1460 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1460
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faf7a98d211
Code: 75 57 89 f0 25 00 00 41 00 3d 00 00 41 00 74 49 80 3d 3a 93 1f 00 00 74 6d 89 da 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 93 00 00 00 48 8b 54 24 28 64 48 2b 14 25
RSP: 002b:00007fff792e0b30 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000080001 RCX: 00007faf7a98d211
RDX: 0000000000080001 RSI: 00007faf7aa2b050 RDI: 00000000ffffff9c
RBP: 00007faf7aa2b050 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
R13: 00007fff792e0bd0 R14: 0000000000000009 R15: 0000000000000000
 </TASK>
soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linux-mm@kvack.org if you depend on this functionality.

final repro crashed as (corrupted=false):
=============================
WARNING: suspicious RCU usage
6.16.0-rc4-next-20250704-syzkaller #0 Not tainted
-----------------------------
fs/proc/proc_sysctl.c:934 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz-executor/5861:
 #0: ffff88803517a428 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
 #1: ffff888031624190 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:884 [inline]
 #1: ffff888031624190 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: open_last_lookups fs/namei.c:3806 [inline]
 #1: ffff888031624190 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: path_openat+0x8cb/0x3830 fs/namei.c:4043
 #2: ffff88807399f0f8 (&lockref->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #2: ffff88807399f0f8 (&lockref->lock){+.+.}-{3:3}, at: d_wait_lookup fs/dcache.c:2537 [inline]
 #2: ffff88807399f0f8 (&lockref->lock){+.+.}-{3:3}, at: d_alloc_parallel+0xbe4/0x15e0 fs/dcache.c:2624

stack backtrace:
CPU: 1 UID: 0 PID: 5861 Comm: syz-executor Not tainted 6.16.0-rc4-next-20250704-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6871
 proc_sys_compare+0x27d/0x2c0 fs/proc/proc_sysctl.c:934
 d_same_name fs/dcache.c:2179 [inline]
 d_alloc_parallel+0x1060/0x15e0 fs/dcache.c:2637
 lookup_open fs/namei.c:3630 [inline]
 open_last_lookups fs/namei.c:3807 [inline]
 path_openat+0xa3b/0x3830 fs/namei.c:4043
 do_filp_open+0x1fa/0x410 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1434
 do_sys_open fs/open.c:1449 [inline]
 __do_sys_openat fs/open.c:1465 [inline]
 __se_sys_openat fs/open.c:1460 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1460
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faf7a98d211
Code: 75 57 89 f0 25 00 00 41 00 3d 00 00 41 00 74 49 80 3d 3a 93 1f 00 00 74 6d 89 da 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 93 00 00 00 48 8b 54 24 28 64 48 2b 14 25
RSP: 002b:00007fff792e0b30 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000080001 RCX: 00007faf7a98d211
RDX: 0000000000080001 RSI: 00007faf7aa2b050 RDI: 00000000ffffff9c
RBP: 00007faf7aa2b050 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
R13: 00007fff792e0bd0 R14: 0000000000000009 R15: 0000000000000000
 </TASK>
soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linux-mm@kvack.org if you depend on this functionality.