syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 UID: 0 PID: 6011 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:fsnotify_parent include/linux/fsnotify.h:81 [inline]
RIP: 0010:fsnotify_path include/linux/fsnotify.h:113 [inline]
RIP: 0010:fsnotify_file include/linux/fsnotify.h:127 [inline]
RIP: 0010:fsnotify_close include/linux/fsnotify.h:457 [inline]
RIP: 0010:__fput+0x1b5/0xa70 fs/file_table.c:454
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 b4 0d ee ff 4d 8b 34 24 49 8d 6e 28 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 ef e8 8d 0d ee ff 41 bc 60 06 00 00 4c 03
RSP: 0018:ffffc90003357d30 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff88801f335c00 RCX: dffffc0000000000
RDX: ffff888030a2bd00 RSI: 0000000004000000 RDI: 0000000002000000
RBP: 0000000000000028 R08: ffffffff8f813377 R09: 1ffffffff1f0266e
R10: dffffc0000000000 R11: ffffffff823a0220 R12: ffff88807651b380
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88802a0128c0
FS:  000055556ef78500(0000) GS:ffff888125e4f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fd63fff CR3: 0000000072fd2000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
 exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdf8198f749
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:00007ffdb178a288 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00000000000159d7 RCX: 00007fdf8198f749
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 00000002b178a57f
R10: 0000001b2f120000 R11: 0000000000000246 R12: 00007fdf81be5fac
R13: 00007fdf81be5fa0 R14: ffffffffffffffff R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:fsnotify_parent include/linux/fsnotify.h:81 [inline]
RIP: 0010:fsnotify_path include/linux/fsnotify.h:113 [inline]
RIP: 0010:fsnotify_file include/linux/fsnotify.h:127 [inline]
RIP: 0010:fsnotify_close include/linux/fsnotify.h:457 [inline]
RIP: 0010:__fput+0x1b5/0xa70 fs/file_table.c:454
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 b4 0d ee ff 4d 8b 34 24 49 8d 6e 28 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 ef e8 8d 0d ee ff 41 bc 60 06 00 00 4c 03
RSP: 0018:ffffc90003357d30 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff88801f335c00 RCX: dffffc0000000000
RDX: ffff888030a2bd00 RSI: 0000000004000000 RDI: 0000000002000000
RBP: 0000000000000028 R08: ffffffff8f813377 R09: 1ffffffff1f0266e
R10: dffffc0000000000 R11: ffffffff823a0220 R12: ffff88807651b380
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88802a0128c0
FS:  000055556ef78500(0000) GS:ffff888125f4f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeb3c1c108 CR3: 0000000072fd2000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   6:	08 4c 89 e7          	or     %cl,-0x19(%rcx,%rcx,4)
   a:	e8 b4 0d ee ff       	call   0xffee0dc3
   f:	4d 8b 34 24          	mov    (%r12),%r14
  13:	49 8d 6e 28          	lea    0x28(%r14),%rbp
  17:	48 89 e8             	mov    %rbp,%rax
  1a:	48 c1 e8 03          	shr    $0x3,%rax
  1e:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  25:	fc ff df
* 28:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2c:	74 08                	je     0x36
  2e:	48 89 ef             	mov    %rbp,%rdi
  31:	e8 8d 0d ee ff       	call   0xffee0dc3
  36:	41 bc 60 06 00 00    	mov    $0x660,%r12d
  3c:	4c                   	rex.WR
  3d:	03                   	.byte 0x3