UDF-fs: error (device loop5): udf_process_sequence: Primary Volume Descriptor not found!
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WARNING: CPU: 0 PID: 1354 at fs/inode.c:343 inc_nlink.cold+0x11/0x18 fs/inode.c:343
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 1354 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x5a kernel/panic.c:541
 report_bug+0x262/0x2b0 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:inc_nlink.cold+0x11/0x18 fs/inode.c:343
Code: c0 74 04 3c 03 7e 08 8b 5d 48 e9 e7 68 b4 f9 4c 89 e7 e8 aa 99 a3 f9 eb ee e8 43 bd 6d f9 48 c7 c7 80 b0 74 88 e8 a2 ee fe ff <0f> 0b e9 29 6a b4 f9 e8 2b bd 6d f9 48 8d 7b 40 b8 ff ff 37 00 48
RSP: 0018:ffff888051567ce8 EFLAGS: 00010282
RAX: 0000000000000024 RBX: ffff888055bf26c0 RCX: 0000000000000000
UDF-fs: Scanning with blocksize 512 failed
RDX: 000000000000cf8e RSI: ffffffff814dff01 RDI: ffffed100a2acf8f
RBP: 0000000000000000 R08: 0000000000000024 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff888055bf2708
R13: ffff88808d7c3c60 R14: ffff8880a50fdb80 R15: ffff8880b3ee7400
 v9fs_vfs_mkdir_dotl+0x4eb/0x610 fs/9p/vfs_inode_dotl.c:463
 vfs_mkdir+0x508/0x7a0 fs/namei.c:3819
 do_mkdirat+0x262/0x2d0 fs/namei.c:3842
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f48828ce0e9
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4881243168 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f48829e0f60 RCX: 00007f48828ce0e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200002c0
RBP: 00007f488292808d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcc06da68f R14: 00007f4881243300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..