REISERFS (device loop4): checking transaction log (loop4)
REISERFS (device loop1): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop5): Using r5 hash to sort names
REISERFS (device loop1): using ordered data mode
==================================================================
BUG: KASAN: out-of-bounds in memmove include/linux/string.h:392 [inline]
BUG: KASAN: out-of-bounds in leaf_paste_entries+0x449/0x910 fs/reiserfs/lbalance.c:1378
Read of size 18446744073709551584 at addr ffff888039e70fa4 by task syz-executor.5/28141

CPU: 1 PID: 28141 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report+0x8f/0xa0 mm/kasan/report.c:412
 memmove+0x20/0x50 mm/kasan/kasan.c:293
 memmove include/linux/string.h:392 [inline]
 leaf_paste_entries+0x449/0x910 fs/reiserfs/lbalance.c:1378
 balance_leaf_finish_node_paste_dirent fs/reiserfs/do_balan.c:1306 [inline]
 balance_leaf_finish_node_paste fs/reiserfs/do_balan.c:1332 [inline]
 balance_leaf_finish_node fs/reiserfs/do_balan.c:1375 [inline]
 balance_leaf+0x8fd7/0xca70 fs/reiserfs/do_balan.c:1463
 do_balance+0x30a/0x760 fs/reiserfs/do_balan.c:1899
 reiserfs_paste_into_item+0x636/0x7d0 fs/reiserfs/stree.c:2169
 reiserfs_add_entry+0x89a/0xcc0 fs/reiserfs/namei.c:566
REISERFS warning (device loop0): sh-2012 read_super_block: found unknown format "2032" of reiserfs with non-standard magic
 reiserfs_mkdir+0x66e/0x980 fs/reiserfs/namei.c:858
REISERFS warning (device loop0): sh-2021 reiserfs_fill_super: can not find reiserfs on loop0
 create_privroot fs/reiserfs/xattr.c:880 [inline]
 reiserfs_xattr_init+0x406/0xae0 fs/reiserfs/xattr.c:1002
 reiserfs_fill_super+0x1f54/0x2d80 fs/reiserfs/super.c:2188
reiserfs: using flush barriers
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x310 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2492 [inline]
 do_mount+0x115c/0x2f50 fs/namespace.c:2822
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f382a49362a
Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3828a03f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000001111 RCX: 00007f382a49362a
RDX: 0000000020001100 RSI: 00000000200001c0 RDI: 00007f3828a03fe0
REISERFS (device loop4): Using r5 hash to sort names
RBP: 00007f3828a04020 R08: 00007f3828a04020 R09: 0000000000208088
R10: 0000000000208088 R11: 0000000000000202 R12: 0000000020001100
R13: 00000000200001c0 R14: 00007f3828a03fe0 R15: 0000000020000000

The buggy address belongs to the page:
page:ffffea0000e79c00 count:2 mapcount:0 mapping:ffff88808fff7ce0 index:0x213
flags: 0xfff00000001064(referenced|lru|active|private)
raw: 00fff00000001064 ffffea0000b77e08 ffffea0000ac6048 ffff88808fff7ce0
REISERFS (device loop4): Created .reiserfs_priv - reserved for xattr storage.
raw: 0000000000000213 ffff88808b17ab28 00000002ffffffff ffff8880b59f68c0
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8880b59f68c0

Memory state around the buggy address:
 ffff888039e70e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888039e70f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888039e70f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                               ^
 ffff888039e71000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888039e71080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================