R13: 00007f90c6f872ca R14: 000000000001056c R15: 00007fff413f52d0
---[ end trace 5458fae90bc57b21 ]---
==================================================================
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/asm-generic/atomic-instrumented.h:250 [inline]
BUG: KASAN: null-ptr-deref in ihold+0x20/0x60 fs/inode.c:423
Write of size 4 at addr 0000000000000170 by task syz-executor/284
CPU: 0 PID: 284 Comm: syz-executor Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
__dump_stack+0x21/0x24 lib/dump_stack.c:77
dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
__kasan_report mm/kasan/report.c:439 [inline]
kasan_report+0xbd/0x140 mm/kasan/report.c:452
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
incfs_kill_sb+0xf7/0x200 fs/incfs/vfs.c:1973
deactivate_locked_super+0xa0/0x100 fs/super.c:335
deactivate_super+0xaf/0xe0 fs/super.c:366
cleanup_mnt+0x44f/0x500 fs/namespace.c:1123
__cleanup_mnt+0x19/0x20 fs/namespace.c:1130
task_work_run+0x127/0x190 kernel/task_work.c:189
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172
exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199
syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274
do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56
entry_SYSCALL_64_after_hwframe+0x61/0xcb
Code: a2 c7 05 5c 26 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:00007fff413f4148 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f90c6ef3097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff413f4200
RBP: 00007fff413f4200 R08: 00007fff413f5200 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff413f5290
R13: 00007f90c6f872ca R14: 000000000001056c R15: 00007fff413f52d0
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000170
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 10af46067
P4D 10af46067
PUD 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 284 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-arch-fallback.h:286 [inline]
RIP: 0010:atomic_inc_return include/asm-generic/atomic-instrumented.h:251 [inline]
RIP: 0010:ihold+0x26/0x60 fs/inode.c:423
Code: 00 00 00 00 55 48 89 e5 41 56 53 48 89 fb e8 b1 7d b7 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 a0 f5 f1 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 31
RSP: 0018:ffffc90000c07d38 EFLAGS: 00010246
RAX: ffff88811e68e200 RBX: 0000000000000000 RCX: ffff88811e68e2c0
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 00000000ffffffff
RBP: ffffc90000c07d48 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0dcf648 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000555576f19500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000126811000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
d_delete_notify include/linux/fsnotify.h:264 [inline]
vfs_rmdir+0x2d5/0x3c0 fs/namei.c:3873
incfs_kill_sb+0xf7/0x200 fs/incfs/vfs.c:1973
deactivate_locked_super+0xa0/0x100 fs/super.c:335
deactivate_super+0xaf/0xe0 fs/super.c:366
cleanup_mnt+0x44f/0x500 fs/namespace.c:1123
__cleanup_mnt+0x19/0x20 fs/namespace.c:1130
task_work_run+0x127/0x190 kernel/task_work.c:189
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172
exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199
syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274
do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f90c6ef3097
Code: a2 c7 05 5c 26 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:00007fff413f4148 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f90c6ef3097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff413f4200
RBP: 00007fff413f4200 R08: 00007fff413f5200 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff413f5290
R13: 00007f90c6f872ca R14: 000000000001056c R15: 00007fff413f52d0
Modules linked in:
CR2: 0000000000000170
---[ end trace 5458fae90bc57b22 ]---
RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline]
RIP: 0010:arch_atomic_inc_return include/linux/atomic-arch-fallback.h:286 [inline]
RIP: 0010:atomic_inc_return include/asm-generic/atomic-instrumented.h:251 [inline]
RIP: 0010:ihold+0x26/0x60 fs/inode.c:423
Code: 00 00 00 00 55 48 89 e5 41 56 53 48 89 fb e8 b1 7d b7 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 a0 f5 f1 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 31
RSP: 0018:ffffc90000c07d38 EFLAGS: 00010246
RAX: ffff88811e68e200 RBX: 0000000000000000 RCX: ffff88811e68e2c0
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 00000000ffffffff
RBP: ffffc90000c07d48 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0dcf648 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000555576f19500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000126811000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: a2 c7 05 5c 26 25 00 movabs %al,0x25265c05c7
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