------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:991 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:991, CPU#0: syz.0.0/5312
Modules linked in:
CPU: 0 UID: 0 PID: 5312 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:991
Code: 4c 89 f7 e8 79 89 d8 ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 74 52 fb ff e8 7f 37 69 ff eb 8c e8 78 37 69 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 6a 37 69 ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc9000f5af5d0 EFLAGS: 00010283
RAX: ffffffff825def18 RBX: ffff88801300dd20 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 0000000000005a56 RDI: 0000000000005a57
RBP: ffffc9000f5af801 R08: ffff88801300dd27 R09: 1ffff11002601ba4
R10: dffffc0000000000 R11: ffffed1002601ba5 R12: ffff88803fb62000
R13: dffffc0000000000 R14: 00000000000000e3 R15: 0000000000000023
FS:  00007f2345e276c0(0000) GS:ffff88808c533000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0256bc6c60 CR3: 000000001258b000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 udf_bitmap_new_block fs/udf/balloc.c:348 [inline]
 udf_new_block+0x17d9/0x1c00 fs/udf/balloc.c:722
 udf_new_inode+0x3bb/0xd60 fs/udf/ialloc.c:67
 udf_create+0x23/0xf0 fs/udf/namei.c:376
 lookup_open+0xc0d/0x1a40 fs/namei.c:4567
 open_last_lookups fs/namei.c:4767 [inline]
 path_openat+0x677/0x1d60 fs/namei.c:4997
 do_file_open+0x23e/0x4a0 fs/namei.c:5029
 do_sys_openat2+0x115/0x200 fs/open.c:1417
 do_sys_open fs/open.c:1423 [inline]
 __do_sys_creat fs/open.c:1501 [inline]
 __se_sys_creat fs/open.c:1495 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1495
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2344f9e0d9
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:00007f2345e26fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f2345226090 RCX: 00007f2344f9e0d9
RDX: 0000000000000000 RSI: 0000000000000040 RDI: 0000200000000580
RBP: 00007f2345035024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2345226128 R14: 00007f2345226090 R15: 00007ffc45588758
 </TASK>