Extracting prog: 2m23.068679229s
Minimizing prog: 56m5.224654189s
Simplifying prog options: 12m6.595094673s
Extracting C: 5m9.21775153s
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: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: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: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: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: KASAN: null-ptr-deref Write in vfs_rmdir
single: successfully extracted reproducer
found reproducer with 7 syscalls
minimizing guilty program
testing program (duration=6m0s, {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: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: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: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: KASAN: null-ptr-deref Write in vfs_rmdir
testing program (duration=6m0s, {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: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: KASAN: null-ptr-deref Write in vfs_rmdir
testing program (duration=6m0s, {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: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: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: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: KASAN: null-ptr-deref Write in vfs_rmdir
testing program (duration=6m0s, {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: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: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: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: KASAN: null-ptr-deref Write in vfs_rmdir
testing program (duration=6m0s, {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: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: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: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: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: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: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: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: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: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: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: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$incfs
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
simplifying guilty program options
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-syz_clone-mount$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: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: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: KASAN: null-ptr-deref Write in vfs_rmdir
validation run: crashed=true
testing program (duration=6m0s, {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: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: KASAN: null-ptr-deref Write in vfs_rmdir
validation run: crashed=true
testing program (duration=6m0s, {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: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: KASAN: null-ptr-deref Write in vfs_rmdir
validation run: crashed=true
reproducing took 1h19m13.496061452s
repro crashed as (corrupted=false):
RBP: 00007f403a21300c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f403a404038 R14: 00007f403a403fa0 R15: 00007fff492c3a38
 </TASK>
---[ end trace 02e3c5dd69ca55d1 ]---
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc_return include/linux/atomic/atomic-instrumented.h:188 [inline]
BUG: KASAN: null-ptr-deref in ihold+0x20/0x60 fs/inode.c:454
Write of size 4 at addr 0000000000000170 by task syz.6.693/3102

CPU: 1 PID: 3102 Comm: syz.6.693 Tainted: G        W         syzkaller #0
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:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 __kasan_report mm/kasan/report.c:431 [inline]
 kasan_report+0xcc/0x150 mm/kasan/report.c:444
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic_inc_return include/linux/atomic/atomic-instrumented.h:188 [inline]
 ihold+0x20/0x60 fs/inode.c:454
 d_delete_notify include/linux/fsnotify.h:275 [inline]
 vfs_rmdir+0x23d/0x450 fs/namei.c:4170
 incfs_kill_sb+0x18f/0x210 fs/incfs/vfs.c:1993
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x44f/0x500 fs/namespace.c:1149
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1156
 task_work_run+0x127/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xb70/0x29a0 kernel/exit.c:890
 __do_sys_exit kernel/exit.c:973 [inline]
 __se_sys_exit kernel/exit.c:971 [inline]
 __x64_sys_exit+0x40/0x40 kernel/exit.c:971
 x64_sys_call+0x44/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f403a17c019
Code: Unable to access opcode bytes at RIP 0x7f403a17bfef.
RSP: 002b:00007f4039fdcfd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007f403a403fa0 RCX: 00007f403a17c019
RDX: 00007f4039fdd9c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f403a21300c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f403a404038 R14: 00007f403a403fa0 R15: 00007fff492c3a38
 </TASK>
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000170
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3102 Comm: syz.6.693 Tainted: G    B   W         syzkaller #0
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:165 [inline]
RIP: 0010:arch_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:370 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:189 [inline]
RIP: 0010:ihold+0x26/0x60 fs/inode.c:454
Code: 00 00 00 00 55 48 89 e5 41 56 53 48 89 fb e8 51 92 b2 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 b0 03 f2 ff 41 be 01 00 00 00 <f0> 44 0f c1 b3 70 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 d1
RSP: 0018:ffffc90004737bf0 EFLAGS: 00010246
RAX: ffff88811d5b0000 RBX: 0000000000000000 RCX: ffff88811d5b0000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc90004737c00 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e18c4c R12: 1ffff110223bd8f4
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000010d71f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 d_delete_notify include/linux/fsnotify.h:275 [inline]
 vfs_rmdir+0x23d/0x450 fs/namei.c:4170
 incfs_kill_sb+0x18f/0x210 fs/incfs/vfs.c:1993
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x44f/0x500 fs/namespace.c:1149
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1156
 task_work_run+0x127/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xb70/0x29a0 kernel/exit.c:890
 __do_sys_exit kernel/exit.c:973 [inline]
 __se_sys_exit kernel/exit.c:971 [inline]
 __x64_sys_exit+0x40/0x40 kernel/exit.c:971
 x64_sys_call+0x44/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f403a17c019
Code: Unable to access opcode bytes at RIP 0x7f403a17bfef.
RSP: 002b:00007f4039fdcfd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007f403a403fa0 RCX: 00007f403a17c019
RDX: 00007f4039fdd9c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f403a21300c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f403a404038 R14: 00007f403a403fa0 R15: 00007fff492c3a38
 </TASK>
Modules linked in:
CR2: 0000000000000170
---[ end trace 02e3c5dd69ca55d2 ]---
RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline]
RIP: 0010:arch_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:370 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:189 [inline]
RIP: 0010:ihold+0x26/0x60 fs/inode.c:454
Code: 00 00 00 00 55 48 89 e5 41 56 53 48 89 fb e8 51 92 b2 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 b0 03 f2 ff 41 be 01 00 00 00 <f0> 44 0f c1 b3 70 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 d1
RSP: 0018:ffffc90004737bf0 EFLAGS: 00010246
RAX: ffff88811d5b0000 RBX: 0000000000000000 RCX: ffff88811d5b0000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc90004737c00 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e18c4c R12: 1ffff110223bd8f4
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000010d71f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   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 51 92 b2 ff       	call   0xffb29264
  13:	48 8d bb 70 01 00 00 	lea    0x170(%rbx),%rdi
  1a:	be 04 00 00 00       	mov    $0x4,%esi
  1f:	e8 b0 03 f2 ff       	call   0xfff203d4
  24:	41 be 01 00 00 00    	mov    $0x1,%r14d
* 2a:	f0 44 0f c1 b3 70 01 	lock xadd %r14d,0x170(%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:	d1                   	.byte 0xd1

final repro crashed as (corrupted=false):
RBP: 00007f403a21300c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f403a404038 R14: 00007f403a403fa0 R15: 00007fff492c3a38
 </TASK>
---[ end trace 02e3c5dd69ca55d1 ]---
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc_return include/linux/atomic/atomic-instrumented.h:188 [inline]
BUG: KASAN: null-ptr-deref in ihold+0x20/0x60 fs/inode.c:454
Write of size 4 at addr 0000000000000170 by task syz.6.693/3102

CPU: 1 PID: 3102 Comm: syz.6.693 Tainted: G        W         syzkaller #0
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:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 __kasan_report mm/kasan/report.c:431 [inline]
 kasan_report+0xcc/0x150 mm/kasan/report.c:444
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic_inc_return include/linux/atomic/atomic-instrumented.h:188 [inline]
 ihold+0x20/0x60 fs/inode.c:454
 d_delete_notify include/linux/fsnotify.h:275 [inline]
 vfs_rmdir+0x23d/0x450 fs/namei.c:4170
 incfs_kill_sb+0x18f/0x210 fs/incfs/vfs.c:1993
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x44f/0x500 fs/namespace.c:1149
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1156
 task_work_run+0x127/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xb70/0x29a0 kernel/exit.c:890
 __do_sys_exit kernel/exit.c:973 [inline]
 __se_sys_exit kernel/exit.c:971 [inline]
 __x64_sys_exit+0x40/0x40 kernel/exit.c:971
 x64_sys_call+0x44/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f403a17c019
Code: Unable to access opcode bytes at RIP 0x7f403a17bfef.
RSP: 002b:00007f4039fdcfd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007f403a403fa0 RCX: 00007f403a17c019
RDX: 00007f4039fdd9c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f403a21300c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f403a404038 R14: 00007f403a403fa0 R15: 00007fff492c3a38
 </TASK>
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000170
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3102 Comm: syz.6.693 Tainted: G    B   W         syzkaller #0
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:165 [inline]
RIP: 0010:arch_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:370 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:189 [inline]
RIP: 0010:ihold+0x26/0x60 fs/inode.c:454
Code: 00 00 00 00 55 48 89 e5 41 56 53 48 89 fb e8 51 92 b2 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 b0 03 f2 ff 41 be 01 00 00 00 <f0> 44 0f c1 b3 70 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 d1
RSP: 0018:ffffc90004737bf0 EFLAGS: 00010246
RAX: ffff88811d5b0000 RBX: 0000000000000000 RCX: ffff88811d5b0000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc90004737c00 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e18c4c R12: 1ffff110223bd8f4
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000010d71f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 d_delete_notify include/linux/fsnotify.h:275 [inline]
 vfs_rmdir+0x23d/0x450 fs/namei.c:4170
 incfs_kill_sb+0x18f/0x210 fs/incfs/vfs.c:1993
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x44f/0x500 fs/namespace.c:1149
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1156
 task_work_run+0x127/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xb70/0x29a0 kernel/exit.c:890
 __do_sys_exit kernel/exit.c:973 [inline]
 __se_sys_exit kernel/exit.c:971 [inline]
 __x64_sys_exit+0x40/0x40 kernel/exit.c:971
 x64_sys_call+0x44/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f403a17c019
Code: Unable to access opcode bytes at RIP 0x7f403a17bfef.
RSP: 002b:00007f4039fdcfd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007f403a403fa0 RCX: 00007f403a17c019
RDX: 00007f4039fdd9c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f403a21300c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f403a404038 R14: 00007f403a403fa0 R15: 00007fff492c3a38
 </TASK>
Modules linked in:
CR2: 0000000000000170
---[ end trace 02e3c5dd69ca55d2 ]---
RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline]
RIP: 0010:arch_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:370 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:189 [inline]
RIP: 0010:ihold+0x26/0x60 fs/inode.c:454
Code: 00 00 00 00 55 48 89 e5 41 56 53 48 89 fb e8 51 92 b2 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 b0 03 f2 ff 41 be 01 00 00 00 <f0> 44 0f c1 b3 70 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 d1
RSP: 0018:ffffc90004737bf0 EFLAGS: 00010246
RAX: ffff88811d5b0000 RBX: 0000000000000000 RCX: ffff88811d5b0000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc90004737c00 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e18c4c R12: 1ffff110223bd8f4
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000010d71f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   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 51 92 b2 ff       	call   0xffb29264
  13:	48 8d bb 70 01 00 00 	lea    0x170(%rbx),%rdi
  1a:	be 04 00 00 00       	mov    $0x4,%esi
  1f:	e8 b0 03 f2 ff       	call   0xfff203d4
  24:	41 be 01 00 00 00    	mov    $0x1,%r14d
* 2a:	f0 44 0f c1 b3 70 01 	lock xadd %r14d,0x170(%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:	d1                   	.byte 0xd1