------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:1093 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093, CPU#0: syz.0.0/5328
Modules linked in:
CPU: 0 UID: 0 PID: 5328 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 04/01/2014
RIP: 0010:mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093
Code: 4c 89 f7 e8 59 0b d9 ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 04 5e fb ff e8 9f d8 69 ff eb 8c e8 98 d8 69 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 8a d8 69 ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc9000e42fbd0 EFLAGS: 00010293
RAX: ffffffff825d4c98 RBX: ffff888043dc8d20 RCX: ffff888000a32540
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc9000e42fc01 R08: ffff888043dc8d27 R09: 1ffff110087b91a4
R10: dffffc0000000000 R11: ffffed10087b91a5 R12: ffff888043dc8d20
R13: ffff88801371c00b R14: dffffc0000000000 R15: ffff88801371c004
FS:  00007f9fc4c016c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9fc4c00fe8 CR3: 000000003fe5d000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 udf_open_lvid+0x369/0x5b0 fs/udf/super.c:2092
 udf_reconfigure+0x336/0x540 fs/udf/super.c:679
 reconfigure_super+0x232/0x8f0 fs/super.c:1020
 do_remount fs/namespace.c:3407 [inline]
 path_mount+0xd4b/0x1040 fs/namespace.c:4153
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4367
 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: 0033:0x7f9fc3d9f28a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f9fc4c00e18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f9fc4c00ea0 RCX: 00007f9fc3d9f28a
RDX: 0000200000000180 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 0000200000000180 R08: 00007f9fc4c00ea0 R09: 0000000001e4047c
R10: 0000000001e4047c R11: 0000000000000246 R12: 0000200000000100
R13: 00007f9fc4c00e60 R14: 0000000000000000 R15: 0000200000000ec0
 </TASK>