------------[ cut here ]------------
WARNING: fs/buffer.c:1183 at mark_buffer_dirty+0x299/0x400 fs/buffer.c:1183, CPU#0: syz.0.0/5352
Modules linked in:
CPU: 0 UID: 0 PID: 5352 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:mark_buffer_dirty+0x299/0x400 fs/buffer.c:1183
Code: 4c 89 f7 e8 29 57 dc ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 24 a2 fb ff e8 6f 41 75 ff eb 8c e8 68 41 75 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 5a 41 75 ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc9000d377608 EFLAGS: 00010287
RAX: ffffffff824be998 RBX: ffff888012017910 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 00000000000007ce RDI: 00000000000007cf
RBP: ffff88803619c001 R08: ffff888012017917 R09: 1ffff11002402f22
R10: dffffc0000000000 R11: ffffed1002402f23 R12: ffff88804c990800
R13: ffff88801200b488 R14: ffff888012017910 R15: 000000000000000a
FS:  00007fcbe5cdc6c0(0000) GS:ffff88808d6b5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdda0bb5662 CR3: 0000000010ed8000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 bfs_move_block fs/bfs/file.c:44 [inline]
 bfs_move_blocks fs/bfs/file.c:57 [inline]
 bfs_get_block+0x5da/0xae0 fs/bfs/file.c:126
 __block_write_begin_int+0x6b5/0x1900 fs/buffer.c:2145
 block_write_begin+0x8a/0x120 fs/buffer.c:2256
 bfs_write_begin+0x35/0xd0 fs/bfs/file.c:180
 generic_perform_write+0x2c5/0x900 mm/filemap.c:4300
 generic_file_write_iter+0x117/0x550 mm/filemap.c:4443
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 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+0x193/0x220 fs/read_write.c:798
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcbe4d8f7c9
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:00007fcbe5cdc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007fcbe4fe6090 RCX: 00007fcbe4d8f7c9
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000007
RBP: 00007fcbe4e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000e7c R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcbe4fe6128 R14: 00007fcbe4fe6090 R15: 00007ffe238320a8
 </TASK>