BUG: kernel NULL pointer dereference, address: 0000000000000170
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 134033067 
P4D 134033067 
PUD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 296 Comm: syz-executor Tainted: G        W          6.1.118-syzkaller-00078-ge2b9748880b9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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+0x25/0x60 fs/inode.c:452
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 b1 59 a8 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 00 cf ef 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 34 5d a8
RSP: 0018:ffffc90001337c30 EFLAGS: 00010202

RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81cd2d10
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000170
RBP: ffffc90001337c40 R08: ffffffff81c99044 R09: fffff52000266f6d
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff110262fb271
R13: ffff8881181edee0 R14: 0000000000000000 R15: 1ffff1102303dbe2
FS:  000055555a1dc500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000012f407000 CR4: 00000000003506a0
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+0x268/0x500 fs/namei.c:4203
 incfs_kill_sb+0x113/0x230 fs/incfs/vfs.c:1995
 deactivate_locked_super+0xad/0x110 fs/super.c:334
 deactivate_super+0xbe/0xf0 fs/super.c:365
 cleanup_mnt+0x485/0x510 fs/namespace.c:1186
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1193
 task_work_run+0x24d/0x2e0 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x94/0xa0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x26/0x130 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8cc4387057
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:00007fffb1aa4b98 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f8cc4387057
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffb1aa4c50
RBP: 00007fffb1aa4c50 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffb1aa5cd0
R13: 00007f8cc44018f4 R14: 00007fffb1aa5d10 R15: 0000000000000001
 </TASK>
Modules linked in:
CR2: 0000000000000170
---[ end trace 0000000000000000 ]---
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+0x25/0x60 fs/inode.c:452
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 b1 59 a8 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 00 cf ef 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 34 5d a8
RSP: 0018:ffffc90001337c30 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81cd2d10
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000170
RBP: ffffc90001337c40 R08: ffffffff81c99044 R09: fffff52000266f6d
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff110262fb271
R13: ffff8881181edee0 R14: 0000000000000000 R15: 1ffff1102303dbe2
FS:  000055555a1dc500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000012f407000 CR4: 00000000003506a0
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 b1 59 a8 ff       	call   0xffa859c5
  14:	49 8d be 70 01 00 00 	lea    0x170(%r14),%rdi
  1b:	be 04 00 00 00       	mov    $0x4,%esi
  20:	e8 00 cf ef ff       	call   0xffefcf25
  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:	34 5d                	xor    $0x5d,%al
  3f:	a8                   	.byte 0xa8