REISERFS warning: green-16003 errcatch_is_left_mergeable: Invalid item type observed, run fsck ASAP
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 ffff0000f622d050 by task syz.6.437/6540

CPU: 1 PID: 6540 Comm: syz.6.437 Not tainted 5.15.182-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
 do_unlinkat+0x360/0x600 fs/namei.c:4355
 __do_sys_unlinkat fs/namei.c:4391 [inline]
 __se_sys_unlinkat fs/namei.c:4384 [inline]
 __arm64_sys_unlinkat+0xe0/0xfc 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:00000000742df7bd refcount:2 mapcount:0 mapping:000000008a1d00e1 index:0x10 pfn:0x13622d
memcg:ffff0000d7380000
aops:def_blk_aops ino:700006
flags: 0x5ffc00000022036(referenced|uptodate|lru|active|private|mappedtodisk|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000022036 fffffc00037aaa08 fffffc000383d4c8 ffff0000c054a048
raw: 0000000000000010 ffff0000e93d4740 00000002ffffffff ffff0000d7380000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f622df00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f622df80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000f622e000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000f622e080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000f622e100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================