------------[ cut here ]------------
err = 556
WARNING: lib/errseq.c:76 at errseq_set+0xdd/0x110 lib/errseq.c:75, CPU#0: kworker/u4:12/1178
Modules linked in:
CPU: 0 UID: 0 PID: 1178 Comm: kworker/u4:12 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:errseq_set+0xdf/0x110 lib/errseq.c:75
Code: fc 44 89 e0 5b 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc e8 94 d6 e6 fc 41 89 ec eb e5 e8 8a d6 e6 fc 48 8d 3d d3 80 a4 0b 89 de <67> 48 0f b9 3a 41 89 ec eb cd 44 89 f1 80 e1 07 80 c1 03 38 c1 0f
RSP: 0018:ffffc9000180f000 EFLAGS: 00010293
RAX: ffffffff84e125b6 RBX: 000000000000022c RCX: ffff888033242580
RDX: 0000000000000000 RSI: 000000000000022c RDI: ffffffff9085a690
RBP: 0000000000000000 R08: ffffea000149ec47 R09: 1ffffd4000293d88
R10: dffffc0000000000 R11: fffff94000293d89 R12: ffff888011f45288
R13: ffffea000149ec40 R14: ffff888011f453a8 R15: ffff888011f45068
FS:  0000000000000000(0000) GS:ffff88808c2bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3d727ab000 CR3: 000000004420c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __filemap_set_wb_err+0x24/0x1e0 mm/filemap.c:703
 mapping_set_error include/linux/pagemap.h:244 [inline]
 ntfs_writepages+0x308/0x4d0 fs/ntfs3/inode.c:1231
 do_writepages+0x338/0x560 mm/page-writeback.c:2560
 __writeback_single_inode+0x136/0x1220 fs/fs-writeback.c:1803
 writeback_sb_inodes+0x9de/0x1b00 fs/fs-writeback.c:2114
 __writeback_inodes_wb+0x114/0x240 fs/fs-writeback.c:2190
 wb_writeback+0x42f/0xad0 fs/fs-writeback.c:2301
 wb_check_start_all fs/fs-writeback.c:2427 [inline]
 wb_do_writeback fs/fs-writeback.c:2474 [inline]
 wb_workfn+0x980/0x10f0 fs/fs-writeback.c:2512
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x480 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>
----------------
Code disassembly (best guess):
   0:	fc                   	cld
   1:	44 89 e0             	mov    %r12d,%eax
   4:	5b                   	pop    %rbx
   5:	41 5c                	pop    %r12
   7:	41 5e                	pop    %r14
   9:	41 5f                	pop    %r15
   b:	5d                   	pop    %rbp
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	cc                   	int3
  12:	e8 94 d6 e6 fc       	call   0xfce6d6ab
  17:	41 89 ec             	mov    %ebp,%r12d
  1a:	eb e5                	jmp    0x1
  1c:	e8 8a d6 e6 fc       	call   0xfce6d6ab
  21:	48 8d 3d d3 80 a4 0b 	lea    0xba480d3(%rip),%rdi        # 0xba480fb
  28:	89 de                	mov    %ebx,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	41 89 ec             	mov    %ebp,%r12d
  32:	eb cd                	jmp    0x1
  34:	44 89 f1             	mov    %r14d,%ecx
  37:	80 e1 07             	and    $0x7,%cl
  3a:	80 c1 03             	add    $0x3,%cl
  3d:	38 c1                	cmp    %al,%cl
  3f:	0f                   	.byte 0xf