REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
==================================================================
BUG: KASAN: use-after-free in reiserfs_get_unused_objectid+0x1c4/0x3bc fs/reiserfs/objectid.c:87
Read of size 250888 at addr ffff0000e4b3c058 by task syz-executor.0/6332

CPU: 0 PID: 6332 Comm: syz-executor.0 Not tainted 6.4.0-rc1-syzkaller-00021-gad2fd53a7870 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233
 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:351 [inline]
 print_report+0x174/0x514 mm/kasan/report.c:462
 kasan_report+0xd4/0x130 mm/kasan/report.c:572
 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:187
 __asan_memmove+0x3c/0x84 mm/kasan/shadow.c:94
 reiserfs_get_unused_objectid+0x1c4/0x3bc fs/reiserfs/objectid.c:87
 reiserfs_new_inode+0x230/0x16b4 fs/reiserfs/inode.c:1944
 reiserfs_mkdir+0x4ac/0x77c fs/reiserfs/namei.c:843
 xattr_mkdir fs/reiserfs/xattr.c:77 [inline]
 create_privroot fs/reiserfs/xattr.c:890 [inline]
 reiserfs_xattr_init+0x2b4/0x638 fs/reiserfs/xattr.c:1006
 reiserfs_fill_super+0x1bfc/0x2028 fs/reiserfs/super.c:2175
 mount_bdev+0x26c/0x368 fs/super.c:1380
 get_super_block+0x44/0x58 fs/reiserfs/super.c:2601
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:610
 vfs_get_tree+0x90/0x274 fs/super.c:1510
 do_new_mount+0x25c/0x8c8 fs/namespace.c:3039
 path_mount+0x590/0xe04 fs/namespace.c:3369
 do_mount fs/namespace.c:3382 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3568
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193
 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591

The buggy address belongs to the physical page:
page:00000000c8ff38ee refcount:3 mapcount:0 mapping:00000000c2aeb39b index:0x10 pfn:0x124b3c
memcg:ffff0000da5bc000
aops:def_blk_aops ino:700000
flags: 0x5ffc20000002042(referenced|workingset|private|node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 05ffc20000002042 0000000000000000 dead000000000122 ffff0000c0949300
raw: 0000000000000010 ffff0000de1c1740 00000003ffffffff ffff0000da5bc000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e4b4cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000e4b4cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000e4b4d000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000e4b4d080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e4b4d100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 1 0(1) DIR], item_len 35, item_location 3985, free_space(entry_count) 2
REISERFS error (device loop0): vs-5150 search_by_key: invalid format found in block 531. Fsck?
REISERFS (device loop0): Remounting filesystem read-only
REISERFS error (device loop0): vs-13050 reiserfs_update_sd_size: i/o failure occurred trying to update [2 1 0x0 SD] stat data
REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 1 0(1) DIR], item_len 35, item_location 3985, free_space(entry_count) 2
REISERFS error (device loop0): vs-5150 search_by_key: invalid format found in block 531. Fsck?
REISERFS error (device loop0): zam-7001 reiserfs_find_entry: io error
REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 1 0(1) DIR], item_len 35, item_location 3985, free_space(entry_count) 2
REISERFS error (device loop0): vs-5150 search_by_key: invalid format found in block 531. Fsck?
REISERFS error (device loop0): vs-13050 reiserfs_update_sd_size: i/o failure occurred trying to update [2 1 0x0 SD] stat data
REISERFS warning (device loop0): jdm-20006 create_privroot: xattrs/ACLs enabled and couldn't find/create .reiserfs_priv. Failing mount.