BFS-fs: bfs_fill_super(): loop0 is unclean, continuing
------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:1080 at mark_buffer_dirty+0x299/0x410, CPU#1: syz.0.1696/18648
Modules linked in:
CPU: 1 UID: 0 PID: 18648 Comm: syz.0.1696 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:mark_buffer_dirty+0x299/0x410
Code: 4c 89 f7 e8 09 90 da ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 74 61 fb ff e8 ef 05 70 ff eb 8c e8 e8 05 70 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 da 05 70 ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc90003fd7608 EFLAGS: 00010283
RAX: ffffffff82551208 RBX: ffff8881b6a691d0 RCX: 0000000000080000
RDX: ffffc9002237d000 RSI: 000000000000161b RDI: 000000000000161c
RBP: ffff8881209e2001 R08: ffff8881b6a691d7 R09: 1ffff11036d4d23a
R10: dffffc0000000000 R11: ffffed1036d4d23b R12: ffff8881adab1000
R13: ffff8881bc239658 R14: ffff8881b6a691d0 R15: 000000000000000f
FS:  00007fbf43df66c0(0000) GS:ffff8882a923d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbf3b80fe00 CR3: 0000000170f68000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 bfs_get_block+0x5da/0xae0
 __block_write_begin_int+0x6c6/0x1910
 block_write_begin+0x8d/0x120
 bfs_write_begin+0x35/0xd0
 generic_perform_write+0x2e2/0x8f0
 generic_file_write_iter+0x14a/0x680
 vfs_write+0x61d/0xb90
 __x64_sys_pwrite64+0x199/0x230
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbf45b9cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbf43df6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007fbf45e15fa0 RCX: 00007fbf45b9cdd9
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000006
RBP: 00007fbf45c32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000e7c R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbf45e16038 R14: 00007fbf45e15fa0 R15: 00007ffd5920f688
 </TASK>
