RBP: 00007fffac8b7da0 R08: 00007fffac8b8da0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffac8b8e30
R13: 00007f3d7d4321ca R14: 00000000000085f9 R15: 00007fffac8b8e70
</TASK>
---[ 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/353
CPU: 0 PID: 353 Comm: syz-executor Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
<TASK>
__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
incfs_kill_sb+0xfe/0x210 fs/incfs/vfs.c:1995
deactivate_locked_super+0xb5/0x120 fs/super.c:336
deactivate_super+0xaf/0xe0 fs/super.c:367
cleanup_mnt+0x45e/0x4e0 fs/namespace.c:1192
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
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
Code: a2 c7 05 5c 06 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fffac8b7ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f3d7d39e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffac8b7da0
RBP: 00007fffac8b7da0 R08: 00007fffac8b8da0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffac8b8e30
R13: 00007f3d7d4321ca R14: 00000000000085f9 R15: 00007fffac8b8e70
</TASK>
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000170
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 12ff26067 P4D 12ff26067 PUD 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 353 Comm: syz-executor Tainted: G B W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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: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 91 1e ab ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 00 ac f0 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 81
RSP: 0018:ffffc90000e57ca0 EFLAGS: 00010246
RAX: ffff888115191400 RBX: 0000000000000000 RCX: ffff888115191440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000e57cb0 R08: ffffffff87b747e7 R09: 1ffffffff0f6e8fc
R10: dffffc0000000000 R11: fffffbfff0f6e8fd R12: ffff88812ff38be4
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000555559fb8500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 00000001371d1000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
d_delete_notify include/linux/fsnotify.h:289 [inline]
vfs_rmdir+0x24c/0x4f0 fs/namei.c:4211
incfs_kill_sb+0xfe/0x210 fs/incfs/vfs.c:1995
deactivate_locked_super+0xb5/0x120 fs/super.c:336
deactivate_super+0xaf/0xe0 fs/super.c:367
cleanup_mnt+0x45e/0x4e0 fs/namespace.c:1192
__cleanup_mnt+0x19/0x20 fs/namespace.c:1199
task_work_run+0x1e1/0x250 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
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: 0033:0x7f3d7d39e097
Code: a2 c7 05 5c 06 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fffac8b7ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f3d7d39e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffac8b7da0
RBP: 00007fffac8b7da0 R08: 00007fffac8b8da0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffac8b8e30
R13: 00007f3d7d4321ca R14: 00000000000085f9 R15: 00007fffac8b8e70
</TASK>
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 91 1e ab ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 00 ac f0 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 81
RSP: 0018:ffffc90000e57ca0 EFLAGS: 00010246
RAX: ffff888115191400 RBX: 0000000000000000 RCX: ffff888115191440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000e57cb0 R08: ffffffff87b747e7 R09: 1ffffffff0f6e8fc
R10: dffffc0000000000 R11: fffffbfff0f6e8fd R12: ffff88812ff38be4
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000555559fb8500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 00000001371d1000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: a2 c7 05 5c 06 25 00 movabs %al,0x25065c05c7
7: 00 00
9: 00 00 add %al,(%rax)
b: eb 96 jmp 0xffffffa3
d: e8 e1 12 00 00 call 0x12f3
12: 90 nop
13: 31 f6 xor %esi,%esi
15: e9 09 00 00 00 jmp 0x23
1a: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1)
21: 00 00
23: b8 a6 00 00 00 mov $0xa6,%eax
28: 0f 05 syscall
* 2a: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction
30: 77 01 ja 0x33
32: c3 ret
33: 48 c7 c2 e8 ff ff ff mov $0xffffffffffffffe8,%rdx
3a: f7 d8 neg %eax
3c: 64 89 02 mov %eax,%fs:(%rdx)
3f: b8 .byte 0xb8