---[ end trace 4e092644ac4854d3 ]---
BUG: kernel NULL pointer dereference, address: 0000000000000170
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 112ddf067 
P4D 112ddf067 
PUD 0 

Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 359 Comm: syz-executor Tainted: G        W         5.10.226-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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+0x25/0x60 fs/inode.c:423
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 c1 28 b3 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 90 c4 f0 ff bb 01 00 00 00 <f0> 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 44 2c b3
RSP: 0018:ffffc90005837d00 EFLAGS: 00010202

RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81b78440
RDX: 0000000000000001 RSI: 0000000000000286 RDI: 0000000000000170
RBP: ffffc90005837d10 R08: ffffffff81b40b41 R09: ffffed1024199dc6
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888120ccf110 R14: 0000000000000000 R15: 0000000000000000
FS:  0000555558a23500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000128e07000 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+0x200/0x3f0 fs/namei.c:3865
 incfs_kill_sb+0x108/0x220 fs/incfs/vfs.c:1973
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 task_work_run+0x129/0x190 kernel/task_work.c:189
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274
 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f5cbb95ba47
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 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 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffd090257d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f5cbb95ba47
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd09025890
RBP: 00007ffd09025890 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd09026910
R13: 00007f5cbb9cd1cc R14: 00000000000060ee R15: 00007ffd09026950
Modules linked in:
CR2: 0000000000000170
---[ end trace 4e092644ac4854d4 ]---
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+0x25/0x60 fs/inode.c:423
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 c1 28 b3 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 90 c4 f0 ff bb 01 00 00 00 <f0> 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 44 2c b3
RSP: 0018:ffffc90005837d00 EFLAGS: 00010202

RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81b78440
RDX: 0000000000000001 RSI: 0000000000000286 RDI: 0000000000000170
RBP: ffffc90005837d10 R08: ffffffff81b40b41 R09: ffffed1024199dc6
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888120ccf110 R14: 0000000000000000 R15: 0000000000000000
FS:  0000555558a23500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000128e07000 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:	00 55 48             	add    %dl,0x48(%rbp)
   7:	89 e5                	mov    %esp,%ebp
   9:	41 56                	push   %r14
   b:	53                   	push   %rbx
   c:	49 89 fe             	mov    %rdi,%r14
   f:	e8 c1 28 b3 ff       	call   0xffb328d5
  14:	49 8d be 70 01 00 00 	lea    0x170(%r14),%rdi
  1b:	be 04 00 00 00       	mov    $0x4,%esi
  20:	e8 90 c4 f0 ff       	call   0xfff0c4b5
  25:	bb 01 00 00 00       	mov    $0x1,%ebx
* 2a:	f0 41 0f c1 9e 70 01 	lock xadd %ebx,0x170(%r14) <-- trapping instruction
  31:	00 00
  33:	ff c3                	inc    %ebx
  35:	bf 02 00 00 00       	mov    $0x2,%edi
  3a:	89 de                	mov    %ebx,%esi
  3c:	e8                   	.byte 0xe8
  3d:	44 2c b3             	rex.R sub $0xb3,%al