------------[ cut here ]------------
WARNING: CPU: 0 PID: 15220 at fs/buffer.c:1183 mark_buffer_dirty+0x38b/0x410 fs/buffer.c:1183
Modules linked in:
CPU: 0 UID: 0 PID: 15220 Comm: syz.7.1956 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:mark_buffer_dirty+0x38b/0x410 fs/buffer.c:1183
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 85 00 00 00 48 8b 3b be 20 00 00 00 e8 f0 ec fb ff e9 d9 fd ff ff e8 f6 ba 74 ff 90 <0f> 0b 90 e9 a1 fc ff ff e8 e8 ba 74 ff 90 0f 0b 90 e9 c3 fc ff ff
RSP: 0018:ffffc90003e7f938 EFLAGS: 00010283
RAX: 0000000000006df4 RBX: ffff88804b2bad98 RCX: ffffc90014f1c000
RDX: 0000000000080000 RSI: ffffffff8246e32a RDI: 0000000000000001
RBP: ffff888055032000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000009
R13: ffffed100aa0642c R14: ffff88804b2bad98 R15: ffff888054bba3a0
FS:  00007f41a47e16c0(0000) GS:ffff8881246b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000002dd030 CR3: 0000000055532000 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+0x3eb/0xe70 fs/bfs/file.c:126
 __block_write_begin_int+0x4f4/0x16d0 fs/buffer.c:2145
 block_write_begin+0x9a/0x1d0 fs/buffer.c:2256
 bfs_write_begin+0x31/0xd0 fs/bfs/file.c:180
 generic_perform_write+0x3c5/0x900 mm/filemap.c:4175
 __generic_file_write_iter+0x1f7/0x240 mm/filemap.c:4292
 generic_file_write_iter+0xe1/0x3c0 mm/filemap.c:4318
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x7d3/0x11d0 fs/read_write.c:686
 ksys_pwrite64 fs/read_write.c:793 [inline]
 __do_sys_pwrite64 fs/read_write.c:801 [inline]
 __se_sys_pwrite64 fs/read_write.c:798 [inline]
 __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:798
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f41a398eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f41a47e1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f41a3bd6090 RCX: 00007f41a398eba9
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000006
RBP: 00007f41a3a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fecc R11: 0000000000000246 R12: 0000000000000000
R13: 00007f41a3bd6128 R14: 00007f41a3bd6090 R15: 00007ffccc92f2e8
 </TASK>