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+0x448/0x638 fs/reiserfs/objectid.c:165
Read of size 8188 at addr ffff0000fad51050 by task syz-executor/4337

CPU: 0 PID: 4337 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x258/0x290 mm/kasan/generic.c:189
 memmove+0x48/0x90 mm/kasan/shadow.c:54
 reiserfs_release_objectid+0x448/0x638 fs/reiserfs/objectid.c:165
 remove_save_link+0x234/0x350 fs/reiserfs/super.c:542
 reiserfs_evict_inode+0x308/0x408 fs/reiserfs/inode.c:91
 evict+0x3d8/0x824 fs/inode.c:705
 iput_final fs/inode.c:1834 [inline]
 iput+0x728/0x7e8 fs/inode.c:1860
 dentry_unlink_inode+0x360/0x438 fs/dcache.c:405
 __dentry_kill+0x318/0x590 fs/dcache.c:611
 dentry_kill+0xcc/0x24c fs/dcache.c:-1
 dput+0x228/0x444 fs/dcache.c:918
 ovl_free_fs+0x158/0x5e4 fs/overlayfs/super.c:235
 ovl_put_super+0x40/0x50 fs/overlayfs/super.c:264
 generic_shutdown_super+0x138/0x32c fs/super.c:501
 kill_anon_super+0x4c/0x80 fs/super.c:1128
 deactivate_locked_super+0xb4/0x128 fs/super.c:332
 deactivate_super+0xe4/0x104 fs/super.c:363
 cleanup_mnt+0x3a8/0x430 fs/namespace.c:1191
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1198
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the physical page:
page:000000000939ec76 refcount:2 mapcount:0 mapping:000000001f978b7c index:0x10 pfn:0x13ad51
memcg:ffff0000f6cac000
aops:def_blk_aops ino:700004
flags: 0x5ffd60000022056(referenced|uptodate|lru|workingset|private|mappedtodisk|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffd60000022056 fffffc0003f1ac88 fffffc0003eb5488 ffff0000c56b6b18
raw: 0000000000000010 ffff0000f5d7e910 00000002ffffffff ffff0000f6cac000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000fad52f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000fad52f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000fad53000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000fad53080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000fad53100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
REISERFS warning: green-16003 errcatch_is_left_mergeable: Invalid item type observed, run fsck ASAP