------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:1087 at mark_buffer_dirty+0x3df/0x480 fs/buffer.c:1087, CPU#1: syz.5.510/7550
Modules linked in:
CPU: 1 UID: 0 PID: 7550 Comm: syz.5.510 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:mark_buffer_dirty+0x3df/0x480 fs/buffer.c:1087
Code: 00 00 00 48 8b 7d 00 be 40 00 00 00 e8 5a d4 fa ff e9 90 fd ff ff e8 50 96 6a ff 90 0f 0b 90 e9 b3 fd ff ff e8 42 96 6a ff 90 <0f> 0b 90 e9 51 fc ff ff e8 34 96 6a ff 90 0f 0b 90 e9 6e fc ff ff
RSP: 0018:ffffc9000500f908 EFLAGS: 00010283
RAX: 0000000000003d7f RBX: ffff888053183740 RCX: ffffc9000f441000
RDX: 0000000000080000 RSI: ffffffff829df79e RDI: ffff88802846dc40
RBP: ffff888053181500 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000000e
R13: dffffc0000000000 R14: ffff888051a02000 R15: ffffed100a34042a
FS:  00007f8fa5fb76c0(0000) GS:ffff88812446e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa1d478a000 CR3: 000000007603d000 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:2042
 block_write_begin+0x9d/0x1d0 fs/buffer.c:2153
 bfs_write_begin+0x31/0xd0 fs/bfs/file.c:180
 generic_perform_write+0x292/0xa40 mm/filemap.c:4325
 __generic_file_write_iter+0x1f7/0x240 mm/filemap.c:4442
 generic_file_write_iter+0xe1/0x3d0 mm/filemap.c:4468
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1070 fs/read_write.c:688
 ksys_write+0x12a/0x250 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8fa519ce59
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:00007f8fa5fb7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8fa5415fa0 RCX: 00007f8fa519ce59
RDX: 000000000000fecc RSI: 00002000000008c0 RDI: 0000000000000007
RBP: 00007f8fa5232d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8fa5416038 R14: 00007f8fa5415fa0 R15: 00007ffef3374378
 </TASK>