Kernel bug: general protection fault in fsnotify_destroy_group
Subsystem: fs
Status: fixed

Crash report:
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000f00
RBP: 00007ffd8b6be440 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f09c35e5fa0 R14: 00007f09c35e5fa0 R15: 0000000000000002
 </TASK>
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 1 UID: 0 PID: 6016 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210
Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 40 01 33 09 cc 66 66 66 66 66 66 2e
RSP: 0018:ffffc90003147c10 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffffffff8b5a8b4e RCX: 707d8ea8101f1b00
RDX: 0000000000000000 RSI: ffffffff8b5a8b4e RDI: 0000000000000003
RBP: ffffffff824e37fd R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1c0c6f3 R12: 0000000000000000
R13: 000000000000001c R14: 000000000000001c R15: 0000000000000001
FS:  000055556de07500(0000) GS:ffff888125f8b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f09c332b5a0 CR3: 00000000750b0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __kasan_check_byte+0x12/0x40 mm/kasan/common.c:572
 kasan_check_byte include/linux/kasan.h:401 [inline]
 lock_acquire+0x84/0x340 kernel/locking/lockdep.c:5842
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 fsnotify_group_stop_queueing fs/notify/group.c:39 [inline]
 fsnotify_destroy_group+0x8d/0x320 fs/notify/group.c:58
 class_fsnotify_group_destructor fs/notify/fanotify/fanotify_user.c:1600 [inline]
 __do_sys_fanotify_init fs/notify/fanotify/fanotify_user.c:1759 [inline]
 __se_sys_fanotify_init+0x991/0xbc0 fs/notify/fanotify/fanotify_user.c:1607
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f09c338f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd8b6be3e8 EFLAGS: 00000246 ORIG_RAX: 000000000000012c
RAX: ffffffffffffffda RBX: 00007f09c35e5fa0 RCX: 00007f09c338f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000f00
RBP: 00007ffd8b6be440 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f09c35e5fa0 R14: 00007f09c35e5fa0 R15: 0000000000000002
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210
Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 40 01 33 09 cc 66 66 66 66 66 66 2e
RSP: 0018:ffffc90003147c10 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffffffff8b5a8b4e RCX: 707d8ea8101f1b00
RDX: 0000000000000000 RSI: ffffffff8b5a8b4e RDI: 0000000000000003
RBP: ffffffff824e37fd R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1c0c6f3 R12: 0000000000000000
R13: 000000000000001c R14: 000000000000001c R15: 0000000000000001
FS:  000055556de07500(0000) GS:ffff888125f8b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f09c332b5a0 CR3: 00000000750b0000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
   7:	00
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	0f 1f 40 d6          	nopl   -0x2a(%rax)
  1c:	48 c1 ef 03          	shr    $0x3,%rdi
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	0f b6 04 07          	movzbl (%rdi,%rax,1),%eax <-- trapping instruction
  2e:	3c 08                	cmp    $0x8,%al
  30:	0f 92 c0             	setb   %al
  33:	e9 40 01 33 09       	jmp    0x9330178
  38:	cc                   	int3
  39:	66                   	data16
  3a:	66                   	data16
  3b:	66                   	data16
  3c:	66                   	data16
  3d:	66                   	data16
  3e:	66                   	data16
  3f:	2e                   	cs