------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:991 at mark_buffer_dirty+0x3ca/0x470 fs/buffer.c:991, CPU#1: syz.3.30/5951
Modules linked in:
CPU: 1 UID: 0 PID: 5951 Comm: syz.3.30 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:mark_buffer_dirty+0x3ca/0x470 fs/buffer.c:991
Code: 00 00 00 48 8b 7d 00 be 40 00 00 00 e8 cf 8e fa ff e9 a3 fd ff ff e8 55 98 62 ff 90 0f 0b 90 e9 c4 fd ff ff e8 47 98 62 ff 90 <0f> 0b 90 e9 64 fc ff ff e8 39 98 62 ff 90 0f 0b 90 e9 81 fc ff ff
RSP: 0018:ffffc90004d1f918 EFLAGS: 00010287
RAX: 00000000000033b4 RBX: ffff88805469a700 RCX: ffffc900058f9000
RDX: 0000000000080000 RSI: ffffffff82a95ca9 RDI: ffff888030a60000
RBP: ffff88805468e300 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000009
R13: dffffc0000000000 R14: ffff88802ad1e000 R15: ffffed10055a3c34
FS:  00007f986fc516c0(0000) GS:ffff888123c59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003000 CR3: 000000002c736000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 bfs_move_block fs/bfs/file.c:44 [inline]
 bfs_move_blocks fs/bfs/file.c:57 [inline]
 bfs_get_block+0x3e4/0xe20 fs/bfs/file.c:126
 __block_write_begin_int+0x57a/0x19c0 fs/buffer.c:2030
 block_write_begin+0x9d/0x1d0 fs/buffer.c:2144
 bfs_write_begin+0x31/0xd0 fs/bfs/file.c:180
 generic_perform_write+0x292/0xa40 mm/filemap.c:4374
 __generic_file_write_iter+0x1f7/0x240 mm/filemap.c:4491
 generic_file_write_iter+0xe1/0x390 mm/filemap.c:4517
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6af/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f986ed9e159
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:00007f986fc51028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f986f025fa0 RCX: 00007f986ed9e159
RDX: 000000000000fecc RSI: 00002000000008c0 RDI: 0000000000000004
RBP: 00007f986ee3503b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f986f026038 R14: 00007f986f025fa0 R15: 00007ffd2a044808
 </TASK>