loop0: detected capacity change from 0 to 64
------------[ 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 59 39 d9 ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 d4 5e fb ff e8 0f 16 6a ff eb 8c e8 08 16 6a ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 fa 15 6a ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc9000379f828 EFLAGS: 00010293
RAX: ffffffff825c2b38 RBX: ffff88801ccad8c0 RCX: ffff88801b784a80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000201 R08: ffff88801ccad8c7 R09: 1ffff11003995b18
R10: dffffc0000000000 R11: ffffed1003995b19 R12: 000000000000000a
R13: ffff88801ccad8c0 R14: ffff888043703700 R15: dffffc0000000000
FS:  00007f2d7224c6c0(0000) GS:ffff88808c846000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 0000000042d4e000 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
 __block_write_begin_int+0x6c2/0x1900 fs/buffer.c:2123
 block_write_begin+0x8d/0x120 fs/buffer.c:2234
 bfs_write_begin+0x35/0xd0 fs/bfs/file.c:180
 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4363
 generic_file_write_iter+0xae/0x330 mm/filemap.c:4506
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_pwrite64 fs/read_write.c:794 [inline]
 __do_sys_pwrite64 fs/read_write.c:802 [inline]
 __se_sys_pwrite64 fs/read_write.c:799 [inline]
 __x64_sys_pwrite64+0x196/0x220 fs/read_write.c:799
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2d7139ce59
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:00007f2d7224bfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f2d71615fa0 RCX: 00007f2d7139ce59
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000004
RBP: 00007f2d71432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000c00 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2d71616038 R14: 00007f2d71615fa0 R15: 00007ffc27fb5eb8
 </TASK>