Extracting prog: 2m12.060102673s
Minimizing prog: 1h5m18.080344516s
Simplifying prog options: 12m5.167129338s
Extracting C: 5m8.836626837s
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}}): mkdir-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 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}}): mkdir-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 0x0)
program crashed: KASAN: null-ptr-deref Write in vfs_rmdir
single: successfully extracted reproducer
found reproducer with 4 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}}): mkdir-mkdir-mount$incfs
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 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-mkdir-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 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-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 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-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 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-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(0x0, 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 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-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(0x0, 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 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-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(0x0, &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 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-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', 0x0, &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 0x0)
program crashed: lost connection to test machine
suppressed program crash: lost connection to test machine
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-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', 0x0, 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 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-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(0x0, &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 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-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', 0x0, 0x0, 0x2000, 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-mkdir-mount$incfs-mount$bind
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-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 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-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 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-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 0x0)
program did not crash
validation run: crashed=false
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-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 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-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 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-mkdir-mount$incfs-mount$bind
detailed listing:
executing program 0:
mkdir(&(0x7f00000000c0)='./control\x00', 0x10)
mkdir(&(0x7f0000000080)='./file0\x00', 0x0)
mount$incfs(&(0x7f0000000300)='./file0\x00', &(0x7f0000000400)='./file0\x00', &(0x7f0000000280), 0x0, 0x0)
mount$bind(&(0x7f0000000480)='./file0\x00', &(0x7f00000004c0)='./control\x00', 0x0, 0x2000, 0x0)
program crashed: KASAN: null-ptr-deref Write in vfs_rmdir
validation run: crashed=true
reproducing took 1h37m56.702642132s
repro crashed as (corrupted=false):
RBP: 00007ffc2cc3a500 R08: 00007ffc2cc3b500 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc2cc3b5f0
R13: 00007fab37c0471f R14: 000000000000af2b R15: 00007ffc2cc3c6c0
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc_return include/linux/atomic/atomic-instrumented.h:198 [inline]
BUG: KASAN: null-ptr-deref in ihold+0x20/0x60 fs/inode.c:455
Write of size 4 at addr 0000000000000170 by task syz-executor/369
CPU: 1 PID: 369 Comm: syz-executor Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
__dump_stack+0x21/0x24 lib/dump_stack.c:88
dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
print_report+0x3d/0x60 mm/kasan/report.c:423
kasan_report+0x122/0x150 mm/kasan/report.c:524
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:102 [inline]
atomic_inc_return include/linux/atomic/atomic-instrumented.h:198 [inline]
ihold+0x20/0x60 fs/inode.c:455
d_delete_notify include/linux/fsnotify.h:289 [inline]
vfs_rmdir+0x25f/0x500 fs/namei.c:4211
incfs_kill_sb+0x198/0x220 fs/incfs/vfs.c:1999
deactivate_locked_super+0xb5/0x120 fs/super.c:334
deactivate_super+0xaf/0xe0 fs/super.c:365
cleanup_mnt+0x474/0x500 fs/namespace.c:1191
__cleanup_mnt+0x19/0x20 fs/namespace.c:1198
task_work_run+0x1e1/0x250 kernel/task_work.c:203
exit_task_work include/linux/task_work.h:39 [inline]
do_exit+0xa35/0x2660 kernel/exit.c:886
do_group_exit+0x210/0x2d0 kernel/exit.c:1028
get_signal+0x13b5/0x1520 kernel/signal.c:2891
arch_do_signal_or_restart+0xd1/0x1140 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fab37b9c117
Code: Unable to access opcode bytes at 0x7fab37b9c0ed.
RSP: 002b:00007ffc2cc3a448 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffea RBX: 0000000000000000 RCX: 00007fab37b9c117
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc2cc3a500
RBP: 00007ffc2cc3a500 R08: 00007ffc2cc3b500 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc2cc3b5f0
R13: 00007fab37c0471f R14: 000000000000af2b R15: 00007ffc2cc3c6c0
==================================================================
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: 1 PID: 369 Comm: syz-executor Tainted: G B W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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:440 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:199 [inline]
RIP: 0010:ihold+0x26/0x60 fs/inode.c:455
Code: 33 36 7c df 55 48 89 e5 41 56 53 48 89 fb e8 21 7c ab ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 90 ac f0 ff 41 be 01 00 00 00 44 0f c1 b3 70 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 11
RSP: 0018:ffffc900017577b8 EFLAGS: 00010246
RAX: ffff888111fa9400 RBX: 0000000000000000 RCX: ffff888111fa9440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900017577c8 R08: ffffffff87b717e7 R09: 1ffffffff0f6e2fc
R10: dffffc0000000000 R11: fffffbfff0f6e2fd R12: ffff888130086a24
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000120ecd000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
d_delete_notify include/linux/fsnotify.h:289 [inline]
vfs_rmdir+0x25f/0x500 fs/namei.c:4211
incfs_kill_sb+0x198/0x220 fs/incfs/vfs.c:1999
deactivate_locked_super+0xb5/0x120 fs/super.c:334
deactivate_super+0xaf/0xe0 fs/super.c:365
cleanup_mnt+0x474/0x500 fs/namespace.c:1191
__cleanup_mnt+0x19/0x20 fs/namespace.c:1198
task_work_run+0x1e1/0x250 kernel/task_work.c:203
exit_task_work include/linux/task_work.h:39 [inline]
do_exit+0xa35/0x2660 kernel/exit.c:886
do_group_exit+0x210/0x2d0 kernel/exit.c:1028
get_signal+0x13b5/0x1520 kernel/signal.c:2891
arch_do_signal_or_restart+0xd1/0x1140 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fab37b9c117
Code: Unable to access opcode bytes at 0x7fab37b9c0ed.
RSP: 002b:00007ffc2cc3a448 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffea RBX: 0000000000000000 RCX: 00007fab37b9c117
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc2cc3a500
RBP: 00007ffc2cc3a500 R08: 00007ffc2cc3b500 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc2cc3b5f0
R13: 00007fab37c0471f R14: 000000000000af2b R15: 00007ffc2cc3c6c0
Modules linked in:
CR2: 0000000000000170
---[ end trace 0000000000000000 ]---
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:440 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:199 [inline]
RIP: 0010:ihold+0x26/0x60 fs/inode.c:455
Code: 33 36 7c df 55 48 89 e5 41 56 53 48 89 fb e8 21 7c ab ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 90 ac f0 ff 41 be 01 00 00 00 44 0f c1 b3 70 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 11
RSP: 0018:ffffc900017577b8 EFLAGS: 00010246
RAX: ffff888111fa9400 RBX: 0000000000000000 RCX: ffff888111fa9440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900017577c8 R08: ffffffff87b717e7 R09: 1ffffffff0f6e2fc
R10: dffffc0000000000 R11: fffffbfff0f6e2fd R12: ffff888130086a24
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000120ecd000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 33 36 xor (%rsi),%esi
2: 7c df jl 0xffffffe3
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 21 7c ab ff call 0xffab7c34
13: 48 8d bb 70 01 00 00 lea 0x170(%rbx),%rdi
1a: be 04 00 00 00 mov $0x4,%esi
1f: e8 90 ac f0 ff call 0xfff0acb4
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: 11 .byte 0x11
final repro crashed as (corrupted=false):
RBP: 00007ffc2cc3a500 R08: 00007ffc2cc3b500 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc2cc3b5f0
R13: 00007fab37c0471f R14: 000000000000af2b R15: 00007ffc2cc3c6c0
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc_return include/linux/atomic/atomic-instrumented.h:198 [inline]
BUG: KASAN: null-ptr-deref in ihold+0x20/0x60 fs/inode.c:455
Write of size 4 at addr 0000000000000170 by task syz-executor/369
CPU: 1 PID: 369 Comm: syz-executor Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
__dump_stack+0x21/0x24 lib/dump_stack.c:88
dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
print_report+0x3d/0x60 mm/kasan/report.c:423
kasan_report+0x122/0x150 mm/kasan/report.c:524
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:102 [inline]
atomic_inc_return include/linux/atomic/atomic-instrumented.h:198 [inline]
ihold+0x20/0x60 fs/inode.c:455
d_delete_notify include/linux/fsnotify.h:289 [inline]
vfs_rmdir+0x25f/0x500 fs/namei.c:4211
incfs_kill_sb+0x198/0x220 fs/incfs/vfs.c:1999
deactivate_locked_super+0xb5/0x120 fs/super.c:334
deactivate_super+0xaf/0xe0 fs/super.c:365
cleanup_mnt+0x474/0x500 fs/namespace.c:1191
__cleanup_mnt+0x19/0x20 fs/namespace.c:1198
task_work_run+0x1e1/0x250 kernel/task_work.c:203
exit_task_work include/linux/task_work.h:39 [inline]
do_exit+0xa35/0x2660 kernel/exit.c:886
do_group_exit+0x210/0x2d0 kernel/exit.c:1028
get_signal+0x13b5/0x1520 kernel/signal.c:2891
arch_do_signal_or_restart+0xd1/0x1140 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fab37b9c117
Code: Unable to access opcode bytes at 0x7fab37b9c0ed.
RSP: 002b:00007ffc2cc3a448 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffea RBX: 0000000000000000 RCX: 00007fab37b9c117
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc2cc3a500
RBP: 00007ffc2cc3a500 R08: 00007ffc2cc3b500 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc2cc3b5f0
R13: 00007fab37c0471f R14: 000000000000af2b R15: 00007ffc2cc3c6c0
==================================================================
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: 1 PID: 369 Comm: syz-executor Tainted: G B W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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:440 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:199 [inline]
RIP: 0010:ihold+0x26/0x60 fs/inode.c:455
Code: 33 36 7c df 55 48 89 e5 41 56 53 48 89 fb e8 21 7c ab ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 90 ac f0 ff 41 be 01 00 00 00 44 0f c1 b3 70 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 11
RSP: 0018:ffffc900017577b8 EFLAGS: 00010246
RAX: ffff888111fa9400 RBX: 0000000000000000 RCX: ffff888111fa9440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900017577c8 R08: ffffffff87b717e7 R09: 1ffffffff0f6e2fc
R10: dffffc0000000000 R11: fffffbfff0f6e2fd R12: ffff888130086a24
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000120ecd000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
d_delete_notify include/linux/fsnotify.h:289 [inline]
vfs_rmdir+0x25f/0x500 fs/namei.c:4211
incfs_kill_sb+0x198/0x220 fs/incfs/vfs.c:1999
deactivate_locked_super+0xb5/0x120 fs/super.c:334
deactivate_super+0xaf/0xe0 fs/super.c:365
cleanup_mnt+0x474/0x500 fs/namespace.c:1191
__cleanup_mnt+0x19/0x20 fs/namespace.c:1198
task_work_run+0x1e1/0x250 kernel/task_work.c:203
exit_task_work include/linux/task_work.h:39 [inline]
do_exit+0xa35/0x2660 kernel/exit.c:886
do_group_exit+0x210/0x2d0 kernel/exit.c:1028
get_signal+0x13b5/0x1520 kernel/signal.c:2891
arch_do_signal_or_restart+0xd1/0x1140 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fab37b9c117
Code: Unable to access opcode bytes at 0x7fab37b9c0ed.
RSP: 002b:00007ffc2cc3a448 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffea RBX: 0000000000000000 RCX: 00007fab37b9c117
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc2cc3a500
RBP: 00007ffc2cc3a500 R08: 00007ffc2cc3b500 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc2cc3b5f0
R13: 00007fab37c0471f R14: 000000000000af2b R15: 00007ffc2cc3c6c0
Modules linked in:
CR2: 0000000000000170
---[ end trace 0000000000000000 ]---
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:440 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:199 [inline]
RIP: 0010:ihold+0x26/0x60 fs/inode.c:455
Code: 33 36 7c df 55 48 89 e5 41 56 53 48 89 fb e8 21 7c ab ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 90 ac f0 ff 41 be 01 00 00 00 44 0f c1 b3 70 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 11
RSP: 0018:ffffc900017577b8 EFLAGS: 00010246
RAX: ffff888111fa9400 RBX: 0000000000000000 RCX: ffff888111fa9440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900017577c8 R08: ffffffff87b717e7 R09: 1ffffffff0f6e2fc
R10: dffffc0000000000 R11: fffffbfff0f6e2fd R12: ffff888130086a24
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000120ecd000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 33 36 xor (%rsi),%esi
2: 7c df jl 0xffffffe3
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 21 7c ab ff call 0xffab7c34
13: 48 8d bb 70 01 00 00 lea 0x170(%rbx),%rdi
1a: be 04 00 00 00 mov $0x4,%esi
1f: e8 90 ac f0 ff call 0xfff0acb4
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: 11 .byte 0x11