Oops: general protection fault, probably for non-canonical address 0xdffffc0000000014: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000000a0-0x00000000000000a7]
CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: loop7 loop_workfn
RIP: 0010:file_inode include/linux/fs.h:1348 [inline]
RIP: 0010:kiocb_start_write include/linux/fs.h:2792 [inline]
RIP: 0010:lo_rw_aio+0xc26/0x1100 drivers/block/loop.c:398
Code: e8 7f 74 05 fc 85 db 0f 84 d8 00 00 00 48 8b 44 24 68 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 12 48 89 df e8 9c 99 77 fc 48 b9 00 00 00 00 00 fc
RSP: 0018:ffffc90000117620 EFLAGS: 00010206
RAX: 0000000000000014 RBX: 00000000000000a0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000117790 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1004eec505 R12: 0000000000000000
R13: 0000000000001000 R14: 0000000000000000 R15: ffff888027762830
FS:  0000000000000000(0000) GS:ffff88812482f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2bb2605ff8 CR3: 000000003afbe000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 do_req_filebacked drivers/block/loop.c:430 [inline]
 loop_handle_cmd drivers/block/loop.c:1845 [inline]
 loop_process_work+0x638/0x11d0 drivers/block/loop.c:1880
 process_one_work kernel/workqueue.c:3495 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
 kthread+0x38b/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:1348 [inline]
RIP: 0010:kiocb_start_write include/linux/fs.h:2792 [inline]
RIP: 0010:lo_rw_aio+0xc26/0x1100 drivers/block/loop.c:398
Code: e8 7f 74 05 fc 85 db 0f 84 d8 00 00 00 48 8b 44 24 68 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 12 48 89 df e8 9c 99 77 fc 48 b9 00 00 00 00 00 fc
RSP: 0018:ffffc90000117620 EFLAGS: 00010206
RAX: 0000000000000014 RBX: 00000000000000a0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000117790 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1004eec505 R12: 0000000000000000
R13: 0000000000001000 R14: 0000000000000000 R15: ffff888027762830
FS:  0000000000000000(0000) GS:ffff88812482f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f87228bd000 CR3: 0000000055cc8000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	e8 7f 74 05 fc       	call   0xfc057484
   5:	85 db                	test   %ebx,%ebx
   7:	0f 84 d8 00 00 00    	je     0xe5
   d:	48 8b 44 24 68       	mov    0x68(%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 12                	je     0x42
  30:	48 89 df             	mov    %rbx,%rdi
  33:	e8 9c 99 77 fc       	call   0xfc7799d4
  38:	48                   	rex.W
  39:	b9 00 00 00 00       	mov    $0x0,%ecx
  3e:	00 fc                	add    %bh,%ah