==================================================================
BUG: KASAN: use-after-free in udf_close_lvid+0x674/0x990 fs/udf/super.c:2108
Write of size 1 at addr ffff8880a3d36980 by task syz-executor.0/4475

CPU: 1 PID: 4475 Comm: syz-executor.0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 udf_close_lvid+0x674/0x990 fs/udf/super.c:2108
 udf_put_super+0xc8/0x160 fs/udf/super.c:2395
 generic_shutdown_super+0x130/0x300 fs/super.c:475
 kill_block_super+0x7c/0xe0 fs/super.c:1427
 deactivate_locked_super+0x93/0xf0 fs/super.c:335
 cleanup_mnt+0x418/0x4d0 fs/namespace.c:1148
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fecef205c87
Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc49b10a88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fecef25fc5a RCX: 00007fecef205c87
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffc49b10b40
RBP: 00007ffc49b10b40 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc49b11c00
R13: 00007fecef25fc5a R14: 000000000001242e R15: 0000000000000006
 </TASK>

The buggy address belongs to the page:
page:ffffea00028f4d80 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa3d36
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea00028f4d88 ffffea00028f4d88 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff8880a3d36880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880a3d36900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880a3d36980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8880a3d36a00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880a3d36a80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================