------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:1093 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093, CPU#0: syz.0.0/5321
Modules linked in:
CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 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
RIP: 0010:mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093
Code: 4c 89 f7 e8 f9 0d d9 ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 d4 5e fb ff e8 1f e9 69 ff eb 8c e8 18 e9 69 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 0a e9 69 ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc9000f4b65c8 EFLAGS: 00010293
RAX: ffffffff825c98b8 RBX: ffff8880325461c0 RCX: ffff88801f52ca80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000201 R08: ffff8880325461c7 R09: 1ffff110064a8c38
R10: dffffc0000000000 R11: ffffed10064a8c39 R12: 0000000000000012
R13: ffff8880325461c0 R14: ffff8880131c6540 R15: dffffc0000000000
FS:  00007f090a2ea6c0(0000) GS:ffff88808c54a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559ae40c2f38 CR3: 0000000012e84000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 bfs_move_block fs/bfs/file.c:44 [inline]
 bfs_move_blocks fs/bfs/file.c:57 [inline]
 bfs_get_block+0x5c6/0xb50 fs/bfs/file.c:126