BFS-fs: bfs_fill_super(): loop6 is unclean, continuing
------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:1080 at mark_buffer_dirty+0x299/0x410, CPU#1: syz.6.397/8409
Modules linked in:
CPU: 1 UID: 0 PID: 8409 Comm: syz.6.397 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 49 91 da ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 b4 62 fb ff e8 2f 07 70 ff eb 8c e8 28 07 70 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 1a 07 70 ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc90003a07608 EFLAGS: 00010287
RAX: ffffffff82550c98 RBX: ffff8881ab03a2b8 RCX: 0000000000080000
RDX: ffffc900297fc000 RSI: 0000000000001494 RDI: 0000000000001495
RBP: ffff88816eb8e001 R08: ffff8881ab03a2bf R09: 1ffff11035607457
R10: dffffc0000000000 R11: ffffed1035607458 R12: ffff8881bcd7a000
R13: ffff8881732470e8 R14: ffff8881ab03a2b8 R15: 000000000000000f
FS:  00007fb097c286c0(0000) GS:ffff8882a923d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f815ff8 CR3: 000000016a88a000 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: 0033:0x7fb096d9cdd9
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:00007fb097c28028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007fb097015fa0 RCX: 00007fb096d9cdd9
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000006
RBP: 00007fb096e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000e7c R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb097016038 R14: 00007fb097015fa0 R15: 00007ffe7155ec18
 </TASK>
