REISERFS warning (device loop0): vs-13060 reiserfs_update_sd_size: stat data of object [1 2 0x0 UNKNOWN] (nlink == 1) not found (pos 2)
REISERFS warning: green-16003 errcatch_is_left_mergeable: Invalid item type observed, run fsck ASAP
==================================================================
BUG: KASAN: use-after-free in reiserfs_release_objectid+0x430/0x614 fs/reiserfs/objectid.c:165
Read of size 8188 at addr ffff0000e855b050 by task syz.0.16/4866

CPU: 0 PID: 4866 Comm: syz.0.16 Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x78/0x30c mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xec/0x15c mm/kasan/report.c:451
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x270/0x2b0 mm/kasan/generic.c:189
 memmove+0x90/0xe8 mm/kasan/shadow.c:54
 reiserfs_release_objectid+0x430/0x614 fs/reiserfs/objectid.c:165
 remove_save_link+0x21c/0x320 fs/reiserfs/super.c:542
 reiserfs_evict_inode+0x2fc/0x3e8 fs/reiserfs/inode.c:91
 evict+0x3c8/0x810 fs/inode.c:647
 iput_final fs/inode.c:1769 [inline]
 iput+0x6c4/0x77c fs/inode.c:1795
 d_delete_notify include/linux/fsnotify.h:267 [inline]
 vfs_rmdir+0x2f4/0x3ec fs/namei.c:4162
 do_rmdir+0x240/0x634 fs/namei.c:4210
 __do_sys_unlinkat fs/namei.c:4390 [inline]
 __se_sys_unlinkat fs/namei.c:4384 [inline]
 __arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4384
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the page:
page:00000000fb387d4e refcount:3 mapcount:0 mapping:000000002b6d12c0 index:0x10 pfn:0x12855b
memcg:ffff0000c9828000
aops:def_blk_aops ino:700000
flags: 0x5ffc00000022026(referenced|uptodate|active|private|mappedtodisk|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000022026 0000000000000000 dead000000000122 ffff0000c0494f48
raw: 0000000000000010 ffff0000ddde7658 00000003ffffffff ffff0000c9828000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e855bf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000e855bf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000e855c000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000e855c080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e855c100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================