blkdev_release+0x15/0x20 block/fops.c:705
     __fput+0x461/0xa70 fs/file_table.c:510
     fput_close_sync+0x11f/0x240 fs/file_table.c:615
     __do_sys_close fs/open.c:1507 [inline]
     __se_sys_close fs/open.c:1492 [inline]
     __x64_sys_close+0x7e/0x110 fs/open.c:1492
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000014: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000000a0-0x00000000000000a7]
CPU: 0 UID: 0 PID: 1411 Comm: kworker/u8:10 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: loop0 loop_workfn
RIP: 0010:file_inode include/linux/fs.h:1353 [inline]
RIP: 0010:kiocb_start_write include/linux/fs.h:2756 [inline]
RIP: 0010:lo_rw_aio+0xb88/0x1190 drivers/block/loop.c:429
Code: 9e 21 34 fc 45 85 e4 0f 84 d8 00 00 00 48 8b 44 24 58 48 8d 98 a0 00 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 8a 95 9d fc 48 8b 1b 48 83 c3 28 49
RSP: 0018:ffffc90006a7f66[  137.094463][ T1411] RSP: 0018:ffffc90006a7f660 EFLAGS: 00010206
RAX: 0000000000000014 RBX: 00000000000000a0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90006a7f7d0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90006a7f723 R11: fffff52000d4fee6 R12: 0000000000000001
R13: ffff888026d51910 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125eb0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555cbea68 CR3: 0000000011bde000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 do_req_filebacked drivers/block/loop.c:461 [inline]
 loop_handle_cmd drivers/block/loop.c:1960 [inline]
 loop_process_work+0x647/0x1560 drivers/block/loop.c:1995
 process_one_work+0x9a3/0x1710 kernel/workqueue.c:3312
 process_scheduled_works kernel/workqueue.c:3403 [inline]
 worker_thread+0xba8/0x11e0 kernel/workqueue.c:3489
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:file_inode include/linux/fs.h:1353 [inline]
RIP: 0010:kiocb_start_write include/linux/fs.h:2756 [inline]
RIP: 0010:lo_rw_aio+0xb88/0x1190 drivers/block/loop.c:429
Code: 9e 21 34 fc 45 85 e4 0f 84 d8 00 00 00 48 8b 44 24 58 48 8d 98 a0 00 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 8a 95 9d fc 48 8b 1b 48 83 c3 28 49
RSP: 0018:ffffc90006a7f660 EFLAGS: 00010206
RAX: 0000000000000014 RBX: 00000000000000a0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90006a7f7d0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90006a7f723 R11: fffff52000d4fee6 R12: 0000000000000001
R13: ffff888026d51910 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125fb0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb2bc8b6000 CR3: 000000003cb24000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	9e                   	sahf
   1:	21 34 fc             	and    %esi,(%rsp,%rdi,8)
   4:	45 85 e4             	test   %r12d,%r12d
   7:	0f 84 d8 00 00 00    	je     0xe5
   d:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  12:	48 8d 98 a0 00 00 00 	lea    0xa0(%rax),%rbx
  19:	48 89 d8             	mov    %rbx,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	48 89 df             	mov    %rbx,%rdi
  33:	e8 8a 95 9d fc       	call   0xfc9d95c2
  38:	48 8b 1b             	mov    (%rbx),%rbx
  3b:	48 83 c3 28          	add    $0x28,%rbx
  3f:	49                   	rex.WB