------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:1093 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093, CPU#1: syz.2.897/14006
Modules linked in:
CPU: 1 UID: 0 PID: 14006 Comm: syz.2.897 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
RIP: 0010:mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093
Code: 4c 89 f7 e8 f9 d1 dd ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 f4 5d fb ff e8 ff 5f 74 ff eb 8c e8 f8 5f 74 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 ea 5f 74 ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc90004787828 EFLAGS: 00010287
RAX: ffffffff8250d898 RBX: ffff88806b5cba20 RCX: 0000000000080000
RDX: ffffc90015662000 RSI: 0000000000001d05 RDI: 0000000000001d06
RBP: 0000000000000201 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100d6b9745 R12: 000000000000000a
R13: ffff88806b5cba20 R14: ffff8880635bca20 R15: dffffc0000000000
FS:  00007ff8c64666c0(0000) GS:ffff888125d45000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff8be0a1000 CR3: 0000000035ec0000 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+0x5d2/0xb60 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+0x2ad/0x8b0 mm/filemap.c:4358
 generic_file_write_iter+0xaf/0x330 mm/filemap.c:4501
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61e/0xbb0 fs/read_write.c:687
 ksys_write+0x156/0x270 fs/read_write.c:739
 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: 0033:0x7ff8c820de99
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:00007ff8c6466028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff8c8495fa0 RCX: 00007ff8c820de99
RDX: 00000000fffffe0f RSI: 0000200000000380 RDI: 0000000000000004
RBP: 00007ff8c82a3eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff8c8496038 R14: 00007ff8c8495fa0 R15: 00007fff6b2e2a98
 </TASK>