reiserfs: using flush barriers
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 rupasov hash to sort names
==================================================================
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 18446744073709551585 at addr ffff88808f01afa4 by task syz-executor372/8075

CPU: 0 PID: 8075 Comm: syz-executor372 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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_mkdir+0x66e/0x980 fs/reiserfs/namei.c:858
 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
 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: 0033:0x7f097d3dd37a
Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcb330eec8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffcb330ef20 RCX: 00007f097d3dd37a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffcb330eee0
RBP: 00007ffcb330eee0 R08: 00007ffcb330ef20 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000020000290
R13: 0000000000000003 R14: 0000000000000004 R15: 0000000000000006

The buggy address belongs to the page:
page:ffffea00023c0680 count:3 mapcount:0 mapping:ffff8880b54023e0 index:0x213
flags: 0xfff00000001044(referenced|active|private)
raw: 00fff00000001044 dead000000000100 dead000000000200 ffff8880b54023e0
raw: 0000000000000213 ffff88808e3f8000 00000003ffffffff ffff8880b59f68c0
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8880b59f68c0

Memory state around the buggy address:
 ffff88808f01ae80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808f01af00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88808f01af80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                               ^
 ffff88808f01b000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88808f01b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================