memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5000 'syz-executor368'
loop0: detected capacity change from 0 to 2048
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
==================================================================
BUG: KASAN: use-after-free in udf_close_lvid.isra.0+0x4a7/0x550 fs/udf/super.c:2039
Write of size 1 at addr ffff8880b1311b78 by task syz-executor368/5000

CPU: 0 PID: 5000 Comm: syz-executor368 Not tainted 6.4.0-rc7-syzkaller-00041-ge660abd551f1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351
 print_report mm/kasan/report.c:462 [inline]
 kasan_report+0x11c/0x130 mm/kasan/report.c:572
 udf_close_lvid.isra.0+0x4a7/0x550 fs/udf/super.c:2039
 udf_put_super+0x1bb/0x230 fs/udf/super.c:2326
 generic_shutdown_super+0x158/0x480 fs/super.c:500
 kill_block_super+0xa1/0x100 fs/super.c:1407
 deactivate_locked_super+0x98/0x160 fs/super.c:331
 deactivate_super+0xb1/0xd0 fs/super.c:362
 cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1177
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xaa3/0x29b0 kernel/exit.c:874
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1033
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f88845e0a59
Code: Unable to access opcode bytes at 0x7f88845e0a2f.
RSP: 002b:00007fffc675b808 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f8884679410 RCX: 00007f88845e0a59
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000246 R12: 00007f8884679410
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0002c4c440 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xb1311
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea0002c4c448 ffffea0002c4c448 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:
 ffff8880b1311a00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880b1311a80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880b1311b00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff8880b1311b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880b1311c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================