------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:1093 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093, CPU#0: syz.5.1269/12415
Modules linked in:
CPU: 0 UID: 0 PID: 12415 Comm: syz.5.1269 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093
Code: 4c 89 f7 e8 59 e7 dd ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 04 78 fb ff e8 8f 1c 72 ff eb 8c e8 88 1c 72 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 7a 1c 72 ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc9000446f828 EFLAGS: 00010287
RAX: ffffffff8252db48 RBX: ffff88803fbe95a0 RCX: 0000000000080000
RDX: ffffc90010ddd000 RSI: 0000000000001d2d RDI: 0000000000001d2e
RBP: 0000000000000201 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1007f7d2b5 R12: 000000000000000a
R13: ffff88803fbe95a0 R14: ffff8880607f9c60 R15: dffffc0000000000
FS:  00007fd4df8566c0(0000) GS:ffff888125ecd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f24c7ba5eac CR3: 00000000343be000 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: 0033:0x7fd4e15fce59
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:00007fd4df856028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd4e1875fa0 RCX: 00007fd4e15fce59
RDX: 000000000000fecc RSI: 00002000000008c0 RDI: 0000000000000007
RBP: 00007fd4e1692e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd4e1876038 R14: 00007fd4e1875fa0 R15: 00007ffcabdb8e88
 </TASK>