------------[ cut here ]------------
WARNING: CPU: 1 PID: 2269 at fs/inode.c:340 drop_nlink+0xce/0x110 fs/inode.c:340
Modules linked in:
CPU: 1 UID: 0 PID: 2269 Comm: syz.0.594 Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:drop_nlink+0xce/0x110 fs/inode.c:340
Code: 04 00 00 be 08 00 00 00 e8 cf 54 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 32 e4 97 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:ffffc9000f4bf860 EFLAGS: 00010293
RAX: ffffffff81ee1a7e RBX: ffff88812fbe4070 RCX: ffff88811570df00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000f4bf888 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001e97efc R12: dffffc0000000000
R13: 1ffff11025f7c817 R14: ffff88812fbe40b8 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc426518710 CR3: 000000010bfc0000 CR4: 00000000003526b0
Call Trace:
shmem_rmdir+0x5f/0x90 mm/shmem.c:3733
vfs_rmdir+0x3dd/0x560 fs/namei.c:4340
incfs_kill_sb+0x109/0x230 fs/incfs/vfs.c:1968
deactivate_locked_super+0xd5/0x2a0 fs/super.c:476
deactivate_super+0xb8/0xe0 fs/super.c:509
cleanup_mnt+0x3f1/0x480 fs/namespace.c:1370
__cleanup_mnt+0x1d/0x40 fs/namespace.c:1377
task_work_run+0x1e0/0x250 kernel/task_work.c:240
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x9bc/0x2630 kernel/exit.c:953
do_group_exit+0x22a/0x300 kernel/exit.c:1095
get_signal+0x139d/0x14f0 kernel/signal.c:2933
arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0053:0x68daea46cc5edccd
Code: Unable to access opcode bytes at 0x68daea46cc5edca3.
RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: 3b493b81f3229b3a
RAX: 000000004d98db3a RBX: 00000000323b3a02 RCX: 00000000060d53a8
RDX: 00000000134f4448 RSI: 000000006b179c8d RDI: 000000001df9f004
RBP: 0000000051feb9e6 R08: 9e00aa80badf9ca3 R09: 262a8f46fc1abed3
R10: d108cbe03db740d8 R11: f0a971f7bb0d4045 R12: 6c14749917ebe22e
R13: f371a5dada18777f R14: d6f16f60921a6484 R15: 83b20c40cccad612
---[ 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.0.594/2269
CPU: 0 UID: 0 PID: 2269 Comm: syz.0.594 Tainted: G W syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
print_report+0x3d/0x70 mm/kasan/report.c:484
kasan_report+0x163/0x1a0 mm/kasan/report.c:594
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x299/0x2a0 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+0x26a/0x560 fs/namei.c:4353
incfs_kill_sb+0x109/0x230 fs/incfs/vfs.c:1968
deactivate_locked_super+0xd5/0x2a0 fs/super.c:476
deactivate_super+0xb8/0xe0 fs/super.c:509
cleanup_mnt+0x3f1/0x480 fs/namespace.c:1370
__cleanup_mnt+0x1d/0x40 fs/namespace.c:1377
task_work_run+0x1e0/0x250 kernel/task_work.c:240
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x9bc/0x2630 kernel/exit.c:953
do_group_exit+0x22a/0x300 kernel/exit.c:1095
get_signal+0x139d/0x14f0 kernel/signal.c:2933
arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0053:0x68daea46cc5edccd
Code: Unable to access opcode bytes at 0x68daea46cc5edca3.
RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: 3b493b81f3229b3a
RAX: 000000004d98db3a RBX: 00000000323b3a02 RCX: 00000000060d53a8
RDX: 00000000134f4448 RSI: 000000006b179c8d RDI: 000000001df9f004
RBP: 0000000051feb9e6 R08: 9e00aa80badf9ca3 R09: 262a8f46fc1abed3
R10: d108cbe03db740d8 R11: f0a971f7bb0d4045 R12: 6c14749917ebe22e
R13: f371a5dada18777f R14: d6f16f60921a6484 R15: 83b20c40cccad612
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000168
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 800000011e5da067 P4D 800000011e5da067 PUD 0
Oops: Oops: 0002 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 2269 Comm: syz.0.594 Tainted: G B W syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Tainted: [B]=BAD_PAGE, [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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 1d db 97 ff 48 8d bb 68 01 00 00 be 04 00 00 00 e8 8c 4b ee ff 41 be 01 00 00 00 44 0f c1 b3 68 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 2d
RSP: 0018:ffffc9000f4bf8a0 EFLAGS: 00010246
RAX: ffff88811570df00 RBX: 0000000000000000 RCX: ffff88811570df00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000f4bf8b0 R08: ffffffff88972947 R09: 1ffffffff112e528
R10: dffffc0000000000 R11: fffffbfff112e529 R12: ffff88812fbe407c
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000168 CR3: 000000011f866000 CR4: 00000000003526b0
Call Trace:
d_delete_notify include/linux/fsnotify.h:357 [inline]
vfs_rmdir+0x26a/0x560 fs/namei.c:4353
incfs_kill_sb+0x109/0x230 fs/incfs/vfs.c:1968
deactivate_locked_super+0xd5/0x2a0 fs/super.c:476
deactivate_super+0xb8/0xe0 fs/super.c:509
cleanup_mnt+0x3f1/0x480 fs/namespace.c:1370
__cleanup_mnt+0x1d/0x40 fs/namespace.c:1377
task_work_run+0x1e0/0x250 kernel/task_work.c:240
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x9bc/0x2630 kernel/exit.c:953
do_group_exit+0x22a/0x300 kernel/exit.c:1095
get_signal+0x139d/0x14f0 kernel/signal.c:2933
arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0053:0x68daea46cc5edccd
Code: Unable to access opcode bytes at 0x68daea46cc5edca3.
RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: 3b493b81f3229b3a
RAX: 000000004d98db3a RBX: 00000000323b3a02 RCX: 00000000060d53a8
RDX: 00000000134f4448 RSI: 000000006b179c8d RDI: 000000001df9f004
RBP: 0000000051feb9e6 R08: 9e00aa80badf9ca3 R09: 262a8f46fc1abed3
R10: d108cbe03db740d8 R11: f0a971f7bb0d4045 R12: 6c14749917ebe22e
R13: f371a5dada18777f R14: d6f16f60921a6484 R15: 83b20c40cccad612
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 1d db 97 ff 48 8d bb 68 01 00 00 be 04 00 00 00 e8 8c 4b ee ff 41 be 01 00 00 00 44 0f c1 b3 68 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 2d
RSP: 0018:ffffc9000f4bf8a0 EFLAGS: 00010246
RAX: ffff88811570df00 RBX: 0000000000000000 RCX: ffff88811570df00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000f4bf8b0 R08: ffffffff88972947 R09: 1ffffffff112e528
R10: dffffc0000000000 R11: fffffbfff112e529 R12: ffff88812fbe407c
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000168 CR3: 000000011f866000 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 1d db 97 ff call 0xff97db30
13: 48 8d bb 68 01 00 00 lea 0x168(%rbx),%rdi
1a: be 04 00 00 00 mov $0x4,%esi
1f: e8 8c 4b ee ff call 0xffee4bb0
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: 2d .byte 0x2d