Extracting prog: 3m19.801087312s
Minimizing prog: 54m50.622849135s
Simplifying prog options: 12m7.006244453s
Extracting C: 5m9.378202495s
Simplifying C: 0s


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:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sched_setaffinity-mkdir-mount$bpf-syz_clone-mkdir-mount$bpf-mount$incfs
detailed listing:
executing program 0:
sched_setaffinity(0x0, 0x0, 0x0)
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
mount$bpf(0x200000000000, 0x0, 0x0, 0xb89046, 0x0)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mkdir(&(0x7f0000000140)='./file0/../file0\x00', 0x190)
mount$bpf(0x200000000000, &(0x7f0000000440)='./file0/../file0\x00', 0x0, 0x989046, 0x0)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 6m0s
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sched_setaffinity-mkdir-mount$bpf-syz_clone-mkdir-mount$bpf-mount$incfs
detailed listing:
executing program 0:
sched_setaffinity(0x0, 0x0, 0x0)
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
mount$bpf(0x200000000000, 0x0, 0x0, 0xb89046, 0x0)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mkdir(&(0x7f0000000140)='./file0/../file0\x00', 0x190)
mount$bpf(0x200000000000, &(0x7f0000000440)='./file0/../file0\x00', 0x0, 0x989046, 0x0)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program crashed: WARNING in shmem_rmdir
single: successfully extracted reproducer
found reproducer with 7 syscalls
minimizing guilty program
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sched_setaffinity-mkdir-mount$bpf-syz_clone-mkdir-mount$bpf
detailed listing:
executing program 0:
sched_setaffinity(0x0, 0x0, 0x0)
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
mount$bpf(0x200000000000, 0x0, 0x0, 0xb89046, 0x0)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mkdir(&(0x7f0000000140)='./file0/../file0\x00', 0x190)
mount$bpf(0x200000000000, &(0x7f0000000440)='./file0/../file0\x00', 0x0, 0x989046, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sched_setaffinity-mkdir-mount$bpf-syz_clone-mkdir-mount$incfs
detailed listing:
executing program 0:
sched_setaffinity(0x0, 0x0, 0x0)
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
mount$bpf(0x200000000000, 0x0, 0x0, 0xb89046, 0x0)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mkdir(&(0x7f0000000140)='./file0/../file0\x00', 0x190)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program crashed: WARNING in shmem_rmdir
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sched_setaffinity-mkdir-mount$bpf-syz_clone-mount$incfs
detailed listing:
executing program 0:
sched_setaffinity(0x0, 0x0, 0x0)
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
mount$bpf(0x200000000000, 0x0, 0x0, 0xb89046, 0x0)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program crashed: WARNING in shmem_rmdir
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sched_setaffinity-mkdir-mount$bpf-mount$incfs
detailed listing:
executing program 0:
sched_setaffinity(0x0, 0x0, 0x0)
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
mount$bpf(0x200000000000, 0x0, 0x0, 0xb89046, 0x0)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sched_setaffinity-mkdir-syz_clone-mount$incfs
detailed listing:
executing program 0:
sched_setaffinity(0x0, 0x0, 0x0)
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program crashed: WARNING in shmem_rmdir
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sched_setaffinity-syz_clone-mount$incfs
detailed listing:
executing program 0:
sched_setaffinity(0x0, 0x0, 0x0)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-syz_clone-mount$incfs
detailed listing:
executing program 0:
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program crashed: WARNING in shmem_rmdir
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-syz_clone-mount$incfs
detailed listing:
executing program 0:
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-syz_clone-mount$incfs
detailed listing:
executing program 0:
mkdir(0x0, 0x18b)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-syz_clone-mount$incfs
detailed listing:
executing program 0:
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mount$incfs(0x0, &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-syz_clone-mount$incfs
detailed listing:
executing program 0:
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', 0x0, &(0x7f0000000000), 0x82, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-syz_clone-mount$incfs
detailed listing:
executing program 0:
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', 0x0, 0x82, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-syz_clone-mount$incfs
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
simplifying guilty program options
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-syz_clone-mount$incfs
detailed listing:
executing program 0:
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program did not crash
testing program (duration=6m0s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-syz_clone-mount$incfs
detailed listing:
executing program 0:
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-syz_clone-mount$incfs
detailed listing:
executing program 0:
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program crashed: WARNING in shmem_rmdir
validation run: crashed=true
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-syz_clone-mount$incfs
detailed listing:
executing program 0:
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program crashed: WARNING in shmem_rmdir
validation run: crashed=true
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-syz_clone-mount$incfs
detailed listing:
executing program 0:
mkdir(&(0x7f0000001a80)='./file0\x00', 0x18b)
syz_clone(0x126400, 0x0, 0x0, 0x0, 0x0, 0x0) (async)
mount$incfs(&(0x7f0000000100)='./file0/../file0\x00', &(0x7f0000000180)='./file0/../file0\x00', &(0x7f0000000000), 0x82, 0x0)

program crashed: WARNING in shmem_rmdir
validation run: crashed=true
reproducing took 1h19m42.412640636s
repro crashed as (corrupted=false):
------------[ cut here ]------------
WARNING: CPU: 0 PID: 993 at fs/inode.c:340 drop_nlink+0xce/0x110 fs/inode.c:340
Modules linked in:
CPU: 0 UID: 0 PID: 993 Comm: syz.5.164 Not tainted syzkaller #0 91781886e4a1baa38ce9d8cd537274748dd3a26f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:drop_nlink+0xce/0x110 fs/inode.c:340
Code: 04 00 00 be 08 00 00 00 e8 4f 14 ee ff f0 48 ff 83 b8 04 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 42 4e 95 ff <0f> 0b eb 81 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 59 ff ff ff 4c
RSP: 0018:ffffc9000256fb28 EFLAGS: 00010293
RAX: ffffffff81f2237e RBX: ffff888130a47bf0 RCX: ffff8881033fdf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000256fb50 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520004adf54 R12: dffffc0000000000
R13: 1ffff11026148f87 R14: ffff888130a47c38 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5967beb700 CR3: 00000000074aa000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 shmem_rmdir+0x5f/0x90 mm/shmem.c:3826
 vfs_rmdir+0x3de/0x560 fs/namei.c:4348
 incfs_kill_sb+0x197/0x220 fs/incfs/vfs.c:1972
 deactivate_locked_super+0xd5/0x270 fs/super.c:478
 deactivate_super+0xb8/0xe0 fs/super.c:511
 cleanup_mnt+0x438/0x4d0 fs/namespace.c:1380
 __cleanup_mnt+0x1d/0x40 fs/namespace.c:1387
 task_work_run+0x1e8/0x260 kernel/task_work.c:246
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xa46/0x2850 kernel/exit.c:955
 __do_sys_exit kernel/exit.c:1064 [inline]
 __se_sys_exit kernel/exit.c:1062 [inline]
 __x64_sys_exit+0x44/0x50 kernel/exit.c:1062
 x64_sys_call+0x2eb9/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd900b9e019
Code: Unable to access opcode bytes at 0x7fd900b9dfef.
RSP: 002b:00007fd9019d6fd8 EFLAGS: 00000246
 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007fd900e25fa0 RCX: 00007fd900b9e019
RDX: 00007fd9019d79c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd900c3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd900e26038 R14: 00007fd900e25fa0 R15: 00007ffdd2299cf8
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 993 at fs/inode.c:340 drop_nlink+0xce/0x110 fs/inode.c:340
Modules linked in:

CPU: 0 UID: 0 PID: 993 Comm: syz.5.164 Tainted: G        W          syzkaller #0 91781886e4a1baa38ce9d8cd537274748dd3a26f
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:drop_nlink+0xce/0x110 fs/inode.c:340
Code: 04 00 00 be 08 00 00 00 e8 4f 14 ee ff f0 48 ff 83 b8 04 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 42 4e 95 ff <0f> 0b eb 81 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 59 ff ff ff 4c
RSP: 0018:ffffc9000256fb28 EFLAGS: 00010293

RAX: ffffffff81f2237e RBX: ffff8881215416c0 RCX: ffff8881033fdf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000256fb50 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520004adf54 R12: dffffc0000000000
R13: 1ffff110242a82e1 R14: ffff888121541708 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555590975918 CR3: 000000012d74e000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 shmem_rmdir+0x67/0x90 mm/shmem.c:3827
 vfs_rmdir+0x3de/0x560 fs/namei.c:4348
 incfs_kill_sb+0x197/0x220 fs/incfs/vfs.c:1972
 deactivate_locked_super+0xd5/0x270 fs/super.c:478
 deactivate_super+0xb8/0xe0 fs/super.c:511
 cleanup_mnt+0x438/0x4d0 fs/namespace.c:1380
 __cleanup_mnt+0x1d/0x40 fs/namespace.c:1387
 task_work_run+0x1e8/0x260 kernel/task_work.c:246
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xa46/0x2850 kernel/exit.c:955
 __do_sys_exit kernel/exit.c:1064 [inline]
 __se_sys_exit kernel/exit.c:1062 [inline]
 __x64_sys_exit+0x44/0x50 kernel/exit.c:1062
 x64_sys_call+0x2eb9/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd900b9e019
Code: Unable to access opcode bytes at 0x7fd900b9dfef.
RSP: 002b:00007fd9019d6fd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007fd900e25fa0 RCX: 00007fd900b9e019
RDX: 00007fd9019d79c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd900c3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd900e26038 R14: 00007fd900e25fa0 R15: 00007ffdd2299cf8
 </TASK>
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc_return include/linux/atomic/atomic-instrumented.h:453 [inline]
BUG: KASAN: null-ptr-deref in ihold+0x24/0x70 fs/inode.c:452
Write of size 4 at addr 0000000000000168 by task syz.5.164/993

CPU: 0 UID: 0 PID: 993 Comm: syz.5.164 Tainted: G        W          syzkaller #0 91781886e4a1baa38ce9d8cd537274748dd3a26f
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 print_report+0x3d/0x70 mm/kasan/report.c:484
 kasan_report+0x162/0x1a0 mm/kasan/report.c:594
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x25a/0x2b0 mm/kasan/generic.c:189
 __kasan_check_write+0x18/0x20 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
 atomic_inc_return include/linux/atomic/atomic-instrumented.h:453 [inline]
 ihold+0x24/0x70 fs/inode.c:452
 d_delete_notify include/linux/fsnotify.h:357 [inline]
 vfs_rmdir+0x25c/0x560 fs/namei.c:4361
 incfs_kill_sb+0x197/0x220 fs/incfs/vfs.c:1972
 deactivate_locked_super+0xd5/0x270 fs/super.c:478
 deactivate_super+0xb8/0xe0 fs/super.c:511
 cleanup_mnt+0x438/0x4d0 fs/namespace.c:1380
 __cleanup_mnt+0x1d/0x40 fs/namespace.c:1387
 task_work_run+0x1e8/0x260 kernel/task_work.c:246
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xa46/0x2850 kernel/exit.c:955
 __do_sys_exit kernel/exit.c:1064 [inline]
 __se_sys_exit kernel/exit.c:1062 [inline]
 __x64_sys_exit+0x44/0x50 kernel/exit.c:1062
 x64_sys_call+0x2eb9/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd900b9e019
Code: Unable to access opcode bytes at 0x7fd900b9dfef.
RSP: 002b:00007fd9019d6fd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007fd900e25fa0 RCX: 00007fd900b9e019
RDX: 00007fd9019d79c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd900c3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd900e26038 R14: 00007fd900e25fa0 R15: 00007ffdd2299cf8
 </TASK>
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000168
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 800000011edc8067 P4D 800000011edc8067 PUD 0 
Oops: Oops: 0002 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 993 Comm: syz.5.164 Tainted: G    B   W          syzkaller #0 91781886e4a1baa38ce9d8cd537274748dd3a26f
Tainted: [B]=BAD_PAGE, [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:85 [inline]
RIP: 0010:raw_atomic_add_return include/linux/atomic/atomic-arch-fallback.h:564 [inline]
RIP: 0010:raw_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:1020 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:454 [inline]
RIP: 0010:ihold+0x2a/0x70 fs/inode.c:452
Code: f3 0f 1e fa 55 48 89 e5 41 56 53 48 89 fb e8 2d 45 95 ff 48 8d bb 68 01 00 00 be 04 00 00 00 e8 0c 0b ee ff 41 be 01 00 00 00 <f0> 44 0f c1 b3 68 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 3d
RSP: 0018:ffffc9000256fb68 EFLAGS: 00010246
RAX: ffff8881033fdf00 RBX: 0000000000000000 RCX: ffff8881033fdf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000256fb78 R08: ffffffff88bb3947 R09: 1ffffffff1176728
R10: dffffc0000000000 R11: fffffbfff1176729 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000168 CR3: 00000001319ec000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 d_delete_notify include/linux/fsnotify.h:357 [inline]
 vfs_rmdir+0x25c/0x560 fs/namei.c:4361
 incfs_kill_sb+0x197/0x220 fs/incfs/vfs.c:1972
 deactivate_locked_super+0xd5/0x270 fs/super.c:478
 deactivate_super+0xb8/0xe0 fs/super.c:511
 cleanup_mnt+0x438/0x4d0 fs/namespace.c:1380
 __cleanup_mnt+0x1d/0x40 fs/namespace.c:1387
 task_work_run+0x1e8/0x260 kernel/task_work.c:246
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xa46/0x2850 kernel/exit.c:955
 __do_sys_exit kernel/exit.c:1064 [inline]
 __se_sys_exit kernel/exit.c:1062 [inline]
 __x64_sys_exit+0x44/0x50 kernel/exit.c:1062
 x64_sys_call+0x2eb9/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd900b9e019
Code: Unable to access opcode bytes at 0x7fd900b9dfef.
RSP: 002b:00007fd9019d6fd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007fd900e25fa0 RCX: 00007fd900b9e019
RDX: 00007fd9019d79c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd900c3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd900e26038 R14: 00007fd900e25fa0 R15: 00007ffdd2299cf8
 </TASK>
Modules linked in:
CR2: 0000000000000168
---[ end trace 0000000000000000 ]---
RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:85 [inline]
RIP: 0010:raw_atomic_add_return include/linux/atomic/atomic-arch-fallback.h:564 [inline]
RIP: 0010:raw_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:1020 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:454 [inline]
RIP: 0010:ihold+0x2a/0x70 fs/inode.c:452
Code: f3 0f 1e fa 55 48 89 e5 41 56 53 48 89 fb e8 2d 45 95 ff 48 8d bb 68 01 00 00 be 04 00 00 00 e8 0c 0b ee ff 41 be 01 00 00 00 <f0> 44 0f c1 b3 68 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 3d
RSP: 0018:ffffc9000256fb68 EFLAGS: 00010246
RAX: ffff8881033fdf00 RBX: 0000000000000000 RCX: ffff8881033fdf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000256fb78 R08: ffffffff88bb3947 R09: 1ffffffff1176728
R10: dffffc0000000000 R11: fffffbfff1176729 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000168 CR3: 00000001319ec000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
   0:	f3 0f 1e fa          	endbr64
   4:	55                   	push   %rbp
   5:	48 89 e5             	mov    %rsp,%rbp
   8:	41 56                	push   %r14
   a:	53                   	push   %rbx
   b:	48 89 fb             	mov    %rdi,%rbx
   e:	e8 2d 45 95 ff       	call   0xff954540
  13:	48 8d bb 68 01 00 00 	lea    0x168(%rbx),%rdi
  1a:	be 04 00 00 00       	mov    $0x4,%esi
  1f:	e8 0c 0b ee ff       	call   0xffee0b30
  24:	41 be 01 00 00 00    	mov    $0x1,%r14d
* 2a:	f0 44 0f c1 b3 68 01 	lock xadd %r14d,0x168(%rbx) <-- trapping instruction
  31:	00 00
  33:	41 ff c6             	inc    %r14d
  36:	bf 02 00 00 00       	mov    $0x2,%edi
  3b:	44 89 f6             	mov    %r14d,%esi
  3e:	e8                   	.byte 0xe8
  3f:	3d                   	.byte 0x3d

final repro crashed as (corrupted=false):
------------[ cut here ]------------
WARNING: CPU: 0 PID: 993 at fs/inode.c:340 drop_nlink+0xce/0x110 fs/inode.c:340
Modules linked in:
CPU: 0 UID: 0 PID: 993 Comm: syz.5.164 Not tainted syzkaller #0 91781886e4a1baa38ce9d8cd537274748dd3a26f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:drop_nlink+0xce/0x110 fs/inode.c:340
Code: 04 00 00 be 08 00 00 00 e8 4f 14 ee ff f0 48 ff 83 b8 04 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 42 4e 95 ff <0f> 0b eb 81 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 59 ff ff ff 4c
RSP: 0018:ffffc9000256fb28 EFLAGS: 00010293
RAX: ffffffff81f2237e RBX: ffff888130a47bf0 RCX: ffff8881033fdf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000256fb50 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520004adf54 R12: dffffc0000000000
R13: 1ffff11026148f87 R14: ffff888130a47c38 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5967beb700 CR3: 00000000074aa000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 shmem_rmdir+0x5f/0x90 mm/shmem.c:3826
 vfs_rmdir+0x3de/0x560 fs/namei.c:4348
 incfs_kill_sb+0x197/0x220 fs/incfs/vfs.c:1972
 deactivate_locked_super+0xd5/0x270 fs/super.c:478
 deactivate_super+0xb8/0xe0 fs/super.c:511
 cleanup_mnt+0x438/0x4d0 fs/namespace.c:1380
 __cleanup_mnt+0x1d/0x40 fs/namespace.c:1387
 task_work_run+0x1e8/0x260 kernel/task_work.c:246
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xa46/0x2850 kernel/exit.c:955
 __do_sys_exit kernel/exit.c:1064 [inline]
 __se_sys_exit kernel/exit.c:1062 [inline]
 __x64_sys_exit+0x44/0x50 kernel/exit.c:1062
 x64_sys_call+0x2eb9/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd900b9e019
Code: Unable to access opcode bytes at 0x7fd900b9dfef.
RSP: 002b:00007fd9019d6fd8 EFLAGS: 00000246
 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007fd900e25fa0 RCX: 00007fd900b9e019
RDX: 00007fd9019d79c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd900c3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd900e26038 R14: 00007fd900e25fa0 R15: 00007ffdd2299cf8
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 993 at fs/inode.c:340 drop_nlink+0xce/0x110 fs/inode.c:340
Modules linked in:

CPU: 0 UID: 0 PID: 993 Comm: syz.5.164 Tainted: G        W          syzkaller #0 91781886e4a1baa38ce9d8cd537274748dd3a26f
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:drop_nlink+0xce/0x110 fs/inode.c:340
Code: 04 00 00 be 08 00 00 00 e8 4f 14 ee ff f0 48 ff 83 b8 04 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 42 4e 95 ff <0f> 0b eb 81 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 59 ff ff ff 4c
RSP: 0018:ffffc9000256fb28 EFLAGS: 00010293

RAX: ffffffff81f2237e RBX: ffff8881215416c0 RCX: ffff8881033fdf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000256fb50 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520004adf54 R12: dffffc0000000000
R13: 1ffff110242a82e1 R14: ffff888121541708 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555590975918 CR3: 000000012d74e000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 shmem_rmdir+0x67/0x90 mm/shmem.c:3827
 vfs_rmdir+0x3de/0x560 fs/namei.c:4348
 incfs_kill_sb+0x197/0x220 fs/incfs/vfs.c:1972
 deactivate_locked_super+0xd5/0x270 fs/super.c:478
 deactivate_super+0xb8/0xe0 fs/super.c:511
 cleanup_mnt+0x438/0x4d0 fs/namespace.c:1380
 __cleanup_mnt+0x1d/0x40 fs/namespace.c:1387
 task_work_run+0x1e8/0x260 kernel/task_work.c:246
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xa46/0x2850 kernel/exit.c:955
 __do_sys_exit kernel/exit.c:1064 [inline]
 __se_sys_exit kernel/exit.c:1062 [inline]
 __x64_sys_exit+0x44/0x50 kernel/exit.c:1062
 x64_sys_call+0x2eb9/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd900b9e019
Code: Unable to access opcode bytes at 0x7fd900b9dfef.
RSP: 002b:00007fd9019d6fd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007fd900e25fa0 RCX: 00007fd900b9e019
RDX: 00007fd9019d79c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd900c3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd900e26038 R14: 00007fd900e25fa0 R15: 00007ffdd2299cf8
 </TASK>
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc_return include/linux/atomic/atomic-instrumented.h:453 [inline]
BUG: KASAN: null-ptr-deref in ihold+0x24/0x70 fs/inode.c:452
Write of size 4 at addr 0000000000000168 by task syz.5.164/993

CPU: 0 UID: 0 PID: 993 Comm: syz.5.164 Tainted: G        W          syzkaller #0 91781886e4a1baa38ce9d8cd537274748dd3a26f
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 print_report+0x3d/0x70 mm/kasan/report.c:484
 kasan_report+0x162/0x1a0 mm/kasan/report.c:594
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x25a/0x2b0 mm/kasan/generic.c:189
 __kasan_check_write+0x18/0x20 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
 atomic_inc_return include/linux/atomic/atomic-instrumented.h:453 [inline]
 ihold+0x24/0x70 fs/inode.c:452
 d_delete_notify include/linux/fsnotify.h:357 [inline]
 vfs_rmdir+0x25c/0x560 fs/namei.c:4361
 incfs_kill_sb+0x197/0x220 fs/incfs/vfs.c:1972
 deactivate_locked_super+0xd5/0x270 fs/super.c:478
 deactivate_super+0xb8/0xe0 fs/super.c:511
 cleanup_mnt+0x438/0x4d0 fs/namespace.c:1380
 __cleanup_mnt+0x1d/0x40 fs/namespace.c:1387
 task_work_run+0x1e8/0x260 kernel/task_work.c:246
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xa46/0x2850 kernel/exit.c:955
 __do_sys_exit kernel/exit.c:1064 [inline]
 __se_sys_exit kernel/exit.c:1062 [inline]
 __x64_sys_exit+0x44/0x50 kernel/exit.c:1062
 x64_sys_call+0x2eb9/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd900b9e019
Code: Unable to access opcode bytes at 0x7fd900b9dfef.
RSP: 002b:00007fd9019d6fd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007fd900e25fa0 RCX: 00007fd900b9e019
RDX: 00007fd9019d79c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd900c3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd900e26038 R14: 00007fd900e25fa0 R15: 00007ffdd2299cf8
 </TASK>
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000168
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 800000011edc8067 P4D 800000011edc8067 PUD 0 
Oops: Oops: 0002 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 993 Comm: syz.5.164 Tainted: G    B   W          syzkaller #0 91781886e4a1baa38ce9d8cd537274748dd3a26f
Tainted: [B]=BAD_PAGE, [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:85 [inline]
RIP: 0010:raw_atomic_add_return include/linux/atomic/atomic-arch-fallback.h:564 [inline]
RIP: 0010:raw_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:1020 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:454 [inline]
RIP: 0010:ihold+0x2a/0x70 fs/inode.c:452
Code: f3 0f 1e fa 55 48 89 e5 41 56 53 48 89 fb e8 2d 45 95 ff 48 8d bb 68 01 00 00 be 04 00 00 00 e8 0c 0b ee ff 41 be 01 00 00 00 <f0> 44 0f c1 b3 68 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 3d
RSP: 0018:ffffc9000256fb68 EFLAGS: 00010246
RAX: ffff8881033fdf00 RBX: 0000000000000000 RCX: ffff8881033fdf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000256fb78 R08: ffffffff88bb3947 R09: 1ffffffff1176728
R10: dffffc0000000000 R11: fffffbfff1176729 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000168 CR3: 00000001319ec000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 d_delete_notify include/linux/fsnotify.h:357 [inline]
 vfs_rmdir+0x25c/0x560 fs/namei.c:4361
 incfs_kill_sb+0x197/0x220 fs/incfs/vfs.c:1972
 deactivate_locked_super+0xd5/0x270 fs/super.c:478
 deactivate_super+0xb8/0xe0 fs/super.c:511
 cleanup_mnt+0x438/0x4d0 fs/namespace.c:1380
 __cleanup_mnt+0x1d/0x40 fs/namespace.c:1387
 task_work_run+0x1e8/0x260 kernel/task_work.c:246
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xa46/0x2850 kernel/exit.c:955
 __do_sys_exit kernel/exit.c:1064 [inline]
 __se_sys_exit kernel/exit.c:1062 [inline]
 __x64_sys_exit+0x44/0x50 kernel/exit.c:1062
 x64_sys_call+0x2eb9/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd900b9e019
Code: Unable to access opcode bytes at 0x7fd900b9dfef.
RSP: 002b:00007fd9019d6fd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007fd900e25fa0 RCX: 00007fd900b9e019
RDX: 00007fd9019d79c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd900c3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd900e26038 R14: 00007fd900e25fa0 R15: 00007ffdd2299cf8
 </TASK>
Modules linked in:
CR2: 0000000000000168
---[ end trace 0000000000000000 ]---
RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:85 [inline]
RIP: 0010:raw_atomic_add_return include/linux/atomic/atomic-arch-fallback.h:564 [inline]
RIP: 0010:raw_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:1020 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:454 [inline]
RIP: 0010:ihold+0x2a/0x70 fs/inode.c:452
Code: f3 0f 1e fa 55 48 89 e5 41 56 53 48 89 fb e8 2d 45 95 ff 48 8d bb 68 01 00 00 be 04 00 00 00 e8 0c 0b ee ff 41 be 01 00 00 00 <f0> 44 0f c1 b3 68 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 3d
RSP: 0018:ffffc9000256fb68 EFLAGS: 00010246
RAX: ffff8881033fdf00 RBX: 0000000000000000 RCX: ffff8881033fdf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000256fb78 R08: ffffffff88bb3947 R09: 1ffffffff1176728
R10: dffffc0000000000 R11: fffffbfff1176729 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000168 CR3: 00000001319ec000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
   0:	f3 0f 1e fa          	endbr64
   4:	55                   	push   %rbp
   5:	48 89 e5             	mov    %rsp,%rbp
   8:	41 56                	push   %r14
   a:	53                   	push   %rbx
   b:	48 89 fb             	mov    %rdi,%rbx
   e:	e8 2d 45 95 ff       	call   0xff954540
  13:	48 8d bb 68 01 00 00 	lea    0x168(%rbx),%rdi
  1a:	be 04 00 00 00       	mov    $0x4,%esi
  1f:	e8 0c 0b ee ff       	call   0xffee0b30
  24:	41 be 01 00 00 00    	mov    $0x1,%r14d
* 2a:	f0 44 0f c1 b3 68 01 	lock xadd %r14d,0x168(%rbx) <-- trapping instruction
  31:	00 00
  33:	41 ff c6             	inc    %r14d
  36:	bf 02 00 00 00       	mov    $0x2,%edi
  3b:	44 89 f6             	mov    %r14d,%esi
  3e:	e8                   	.byte 0xe8
  3f:	3d                   	.byte 0x3d