loop6: detected capacity change from 0 to 64
------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:1180 at mark_buffer_dirty+0x299/0x440 fs/buffer.c:1180, CPU#0: syz.6.626/11190
Modules linked in:
CPU: 0 UID: 0 PID: 11190 Comm: syz.6.626 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:mark_buffer_dirty+0x299/0x440 fs/buffer.c:1180
Code: 4c 89 f7 e8 f9 0d df ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 d4 60 fb ff e8 bf 04 79 ff eb 8c e8 b8 04 79 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 aa 04 79 ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc9000679f488 EFLAGS: 00010293
RAX: ffffffff824b4e28 RBX: ffff88804093a5c8 RCX: ffff8880375c9e40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888067bc6001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10081274ba R12: ffff8880703cc400
R13: ffff888060a545c8 R14: ffff88804093a5c8 R15: 000000000000000a
FS:  00007f2e533f66c0(0000) GS:ffff888126343000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 00000000606ea000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 bfs_move_block fs/bfs/file.c:44 [inline]
 bfs_move_blocks fs/bfs/file.c:57 [inline]
 bfs_get_block+0x5da/0xae0 fs/bfs/file.c:126
 __block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2142
 block_write_begin+0x8d/0x120 fs/buffer.c:2253
 bfs_write_begin+0x35/0xd0 fs/bfs/file.c:180
 generic_perform_write+0x2af/0x8b0 mm/filemap.c:4314
 generic_file_write_iter+0x14b/0x690 mm/filemap.c:4457
 do_iter_readv_writev+0x62b/0x8d0 fs/read_write.c:-1
 vfs_writev+0x345/0x9a0 fs/read_write.c:1059
 do_writev+0x15a/0x2e0 fs/read_write.c:1105
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2e5519c629
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:00007f2e533f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f2e55415fa0 RCX: 00007f2e5519c629
RDX: 0000000000000001 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007f2e55232b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2e55416038 R14: 00007f2e55415fa0 R15: 00007ffe688f0868
 </TASK>