------------[ cut here ]------------
WARNING: fs/buffer.c:1183 at mark_buffer_dirty+0x2a9/0x410, CPU#1: syz.4.10200/14364
Modules linked in:
CPU: 1 UID: 0 PID: 14364 Comm: syz.4.10200 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:mark_buffer_dirty+0x2a9/0x410
Code: 4c 89 f7 e8 d9 44 dd ff 49 8b 3e be 20 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 d4 fa fb ff e8 1f 46 79 ff eb 8c e8 18 46 79 ff 90 <0f> 0b 90 e9 95 fd ff ff e8 0a 46 79 ff 90 0f 0b 90 e9 bf fd ff ff
RSP: 0018:ffffc900039af608 EFLAGS: 00010283
RAX: ffffffff82466468 RBX: ffff88803edef910 RCX: 0000000000080000
RDX: ffffc900261dd000 RSI: 0000000000000167 RDI: 0000000000000168
RBP: ffff88802a95e001 R08: ffff88803edef917 R09: 1ffff11007dbdf22
R10: dffffc0000000000 R11: ffffed1007dbdf23 R12: ffff8880342c2a00
R13: ffff88803edef9f8 R14: ffff88803edef910 R15: 000000000000000a
FS:  00007f699d6506c0(0000) GS:ffff8881a39f1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557225f808 CR3: 0000000133608000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 bfs_get_block+0x5da/0xae0
 __block_write_begin_int+0x6b5/0x1900
 block_write_begin+0x8a/0x120
 bfs_write_begin+0x35/0xd0
 generic_perform_write+0x2c5/0x900
 generic_file_write_iter+0x117/0x550
 vfs_write+0x5c9/0xb30
 __x64_sys_pwrite64+0x193/0x220
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f699c78ebe9
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:00007f699d650038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f699c9c5fa0 RCX: 00007f699c78ebe9
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 000000000000000c
RBP: 00007f699c811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000e7c R11: 0000000000000246 R12: 0000000000000000
R13: 00007f699c9c6038 R14: 00007f699c9c5fa0 R15: 00007ffd928a13c8
 </TASK>
