REISERFS (device loop0): journal params: device loop0, size 15748, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using tea hash to sort names
==================================================================
BUG: KASAN: out-of-bounds in memmove include/linux/string.h:462 [inline]
BUG: KASAN: out-of-bounds in leaf_paste_entries+0x405/0xa10 fs/reiserfs/lbalance.c:1377
Read of size 18446744073709551584 at addr ffff88803ebbbfa4 by task syz-executor490/5887

CPU: 1 PID: 5887 Comm: syz-executor490 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x9a/0xcc lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2c6 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
 check_memory_region_inline mm/kasan/generic.c:179 [inline]
 check_memory_region+0x13d/0x180 mm/kasan/generic.c:185
 memmove+0x20/0x60 mm/kasan/shadow.c:53
 memmove include/linux/string.h:462 [inline]
 leaf_paste_entries+0x405/0xa10 fs/reiserfs/lbalance.c:1377
 balance_leaf_finish_node_paste_dirent fs/reiserfs/do_balan.c:1295 [inline]
 balance_leaf_finish_node_paste fs/reiserfs/do_balan.c:1321 [inline]
 balance_leaf_finish_node fs/reiserfs/do_balan.c:1364 [inline]
 balance_leaf+0x8d0d/0xd3c0 fs/reiserfs/do_balan.c:1452
 do_balance+0x2ee/0x760 fs/reiserfs/do_balan.c:1888
 reiserfs_paste_into_item+0x63c/0x7b0 fs/reiserfs/stree.c:2138
 reiserfs_add_entry+0x7fd/0xc40 fs/reiserfs/namei.c:566
 reiserfs_mkdir+0x59c/0x860 fs/reiserfs/namei.c:858
 create_privroot fs/reiserfs/xattr.c:889 [inline]
 reiserfs_xattr_init+0x412/0xa60 fs/reiserfs/xattr.c:1011
 reiserfs_fill_super+0x1c53/0x2670 fs/reiserfs/super.c:2177
 mount_bdev+0x2cb/0x3b0 fs/super.c:1366
 legacy_get_tree+0xfa/0x1f0 fs/fs_context.c:592
 vfs_get_tree+0x7f/0x2c0 fs/super.c:1496
 do_new_mount fs/namespace.c:2881 [inline]
 path_mount+0x7f3/0x1b30 fs/namespace.c:3211
 do_mount fs/namespace.c:3224 [inline]
 __do_sys_mount fs/namespace.c:3432 [inline]
 __se_sys_mount fs/namespace.c:3409 [inline]
 __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3409
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f446b307d0a
Code: 48 c7 c2 c0 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 a8 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc224868f8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc22486950 RCX: 00007f446b307d0a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffc22486910
RBP: 00007ffc22486910 R08: 00007ffc22486950 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000286 R12: 00000000200002a8
R13: 0000000000000003 R14: 0000000000000004 R15: 0000000000000007

The buggy address belongs to the page:
page:00000000ae3e9e5d refcount:3 mapcount:0 mapping:000000009f494180 index:0x3d97 pfn:0x3ebbb
aops:def_blk_aops ino:700000
flags: 0xfff00000002022(referenced|active|private)
raw: 00fff00000002022 dead000000000100 dead000000000122 ffff888018952b50
raw: 0000000000003d97 ffff88803aa2e040 00000003ffffffff ffff8880101f2000
page dumped because: kasan: bad access detected
pages's memcg:ffff8880101f2000
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 5887, ts 76404963547
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x144/0x1c0 mm/page_alloc.c:2297
 prep_new_page mm/page_alloc.c:2306 [inline]
 get_page_from_freelist+0x1c6e/0x3f80 mm/page_alloc.c:3945
 __alloc_pages_nodemask+0x2d6/0x730 mm/page_alloc.c:4995
 pagecache_get_page+0x1fc/0xce0 mm/filemap.c:1841
 find_or_create_page include/linux/pagemap.h:404 [inline]
 grow_dev_page fs/buffer.c:974 [inline]
 grow_buffers fs/buffer.c:1043 [inline]
 __getblk_slow+0x1b6/0x7d0 fs/buffer.c:1070
 sb_getblk include/linux/buffer_head.h:325 [inline]
 search_by_key+0x35c/0x4240 fs/reiserfs/stree.c:651
 reiserfs_read_locked_inode+0x144/0x21c0 fs/reiserfs/inode.c:1557
 reiserfs_fill_super+0x152a/0x2670 fs/reiserfs/super.c:2081
 mount_bdev+0x2cb/0x3b0 fs/super.c:1366
 legacy_get_tree+0xfa/0x1f0 fs/fs_context.c:592
 vfs_get_tree+0x7f/0x2c0 fs/super.c:1496
 do_new_mount fs/namespace.c:2881 [inline]
 path_mount+0x7f3/0x1b30 fs/namespace.c:3211
 do_mount fs/namespace.c:3224 [inline]
 __do_sys_mount fs/namespace.c:3432 [inline]
 __se_sys_mount fs/namespace.c:3409 [inline]
 __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3409
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88803ebbbe80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88803ebbbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88803ebbbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                               ^
 ffff88803ebbc000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88803ebbc080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================