[v5.15] WARNING in udf_free_inode (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 68efe5a6c16a Linux 5.15.197
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=147ed61a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7e6ed99963d6ee1d
dashboard link: https://syzkaller.appspot.com/bug?extid=c33e63c758169f35186d
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/900f9b9bd850/disk-68efe5a6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1e089a5019a6/vmlinux-68efe5a6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b319f477b907/bzImage-68efe5a6.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c33e63...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 4292 at fs/udf/udfdecl.h:127 udf_updated_lvid fs/udf/udfdecl.h:125 [inline]
WARNING: CPU: 0 PID: 4292 at fs/udf/udfdecl.h:127 udf_free_inode+0x21c/0x2d0 fs/udf/ialloc.c:41
Modules linked in:
CPU: 1 PID: 4292 Comm: syz.2.3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:udf_updated_lvid fs/udf/udfdecl.h:125 [inline]
RIP: 0010:udf_free_inode+0x21c/0x2d0 fs/udf/ialloc.c:41
Code: ff ff 4c 89 f7 31 f6 48 89 da 31 c9 41 b8 01 00 00 00 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 e9 91 ff ff e8 94 b3 b5 fe <0f> 0b e9 74 ff ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c 72 fe ff ff
RSP: 0018:ffffc9000341fc70 EFLAGS: 00010283
RAX: ffffffff82c2187c RBX: ffff88805e8607c0 RCX: 0000000000080000
RDX: ffffc9000ed51000 RSI: 000000000000bc2e RDI: 000000000000bc2f
RBP: 00000000675ad6b5 R08: dffffc0000000000 R09: fffff52000683f49
R10: fffff52000683f49 R11: 1ffff92000683f48 R12: 1ffff110298abccf
R13: ffff88805ef3001c R14: dffffc0000000000 R15: ffff88814c55e678
FS: 00007fc5bec8e6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd9bdde4000 CR3: 000000005f5c0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
evict+0x485/0x870 fs/inode.c:647
do_unlinkat+0x3d8/0x6f0 fs/namei.c:4363
__do_sys_unlink fs/namei.c:4404 [inline]
__se_sys_unlink fs/namei.c:4402 [inline]
__x64_sys_unlink+0x45/0x50 fs/namei.c:4402
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc5c0a48749
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:00007fc5bec8e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007fc5c0c9f090 RCX: 00007fc5c0a48749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000180
RBP: 00007fc5c0accf91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc5c0c9f128 R14: 00007fc5c0c9f090 R15: 00007ffd151d07b8
</TASK>


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