REISERFS warning:  read_super_block: reiserfs filesystem is deprecated and scheduled to be removed from the kernel in 2025
REISERFS (device loop0): found reiserfs format "3.6" with non-standard journal
REISERFS (device loop0): using ordered data mode
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 leaf_paste_entries+0x449/0x910 fs/reiserfs/lbalance.c:1377
Read of size 18446744073709551585 at addr ffff888071805fa4 by task syz-executor987/3602

CPU: 1 PID: 3602 Comm: syz-executor987 Not tainted 6.1.0-rc1-next-20221021-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:253 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:364
 kasan_report+0xbb/0x1f0 mm/kasan/report.c:464
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
 memmove+0x20/0x60 mm/kasan/shadow.c:54
 leaf_paste_entries+0x449/0x910 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+0x917d/0xde40 fs/reiserfs/do_balan.c:1452
 do_balance+0x315/0x810 fs/reiserfs/do_balan.c:1888
 reiserfs_paste_into_item+0x763/0x8e0 fs/reiserfs/stree.c:2159
 reiserfs_add_entry+0x8cb/0xcf0 fs/reiserfs/namei.c:567
 reiserfs_mkdir+0x675/0x980 fs/reiserfs/namei.c:860
 xattr_mkdir fs/reiserfs/xattr.c:76 [inline]
 create_privroot fs/reiserfs/xattr.c:882 [inline]
 reiserfs_xattr_init+0x57a/0xc30 fs/reiserfs/xattr.c:1005
 reiserfs_fill_super+0x2127/0x2e90 fs/reiserfs/super.c:2175
 mount_bdev+0x34d/0x410 fs/super.c:1401
 legacy_get_tree+0x105/0x220 fs/fs_context.c:617
 vfs_get_tree+0x89/0x2f0 fs/super.c:1531
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1326/0x1e20 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fe0698012aa
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:00007ffd0ebfcff8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fe0698012aa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffd0ebfd010
RBP: 00007ffd0ebfd010 R08: 00007ffd0ebfd050 R09: 00005555571952c0
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000004
R13: 00007ffd0ebfd050 R14: 0000000000000006 R15: 0000000020000290
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001c60140 refcount:3 mapcount:0 mapping:ffff88801b3e75f8 index:0x213 pfn:0x71805
memcg:ffff88813fe50000
aops:def_blk_aops ino:700000
flags: 0xfff00000002022(referenced|active|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002022 0000000000000000 dead000000000122 ffff88801b3e75f8
raw: 0000000000000213 ffff88807435e658 00000003ffffffff ffff88813fe50000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 3602, tgid 3602 (syz-executor987), ts 50005929875, free_ts 44495089544
 prep_new_page mm/page_alloc.c:2538 [inline]
 get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4287
 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2285
 folio_alloc+0x1c/0x70 mm/mempolicy.c:2295
 filemap_alloc_folio+0x306/0x3a0 mm/filemap.c:971
 __filemap_get_folio+0x328/0xd90 mm/filemap.c:1965
 pagecache_get_page+0x2a/0x280 mm/folio-compat.c:110
 find_or_create_page include/linux/pagemap.h:612 [inline]
 grow_dev_page fs/buffer.c:946 [inline]
 grow_buffers fs/buffer.c:1011 [inline]
 __getblk_slow+0x1f4/0xfb0 fs/buffer.c:1038
 __getblk_gfp+0x6e/0x80 fs/buffer.c:1333
 sb_getblk include/linux/buffer_head.h:356 [inline]
 search_by_key+0x3a8/0x3bf0 fs/reiserfs/stree.c:672
 reiserfs_read_locked_inode+0x154/0x2160 fs/reiserfs/inode.c:1549
 reiserfs_fill_super+0x126f/0x2e90 fs/reiserfs/super.c:2071
 mount_bdev+0x34d/0x410 fs/super.c:1401
 legacy_get_tree+0x105/0x220 fs/fs_context.c:617
 vfs_get_tree+0x89/0x2f0 fs/super.c:1531
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1326/0x1e20 fs/namespace.c:3370
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1458 [inline]
 free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508
 free_unref_page_prepare mm/page_alloc.c:3386 [inline]
 free_unref_page_list+0x172/0xc40 mm/page_alloc.c:3528
 release_pages+0x35b/0x12d0 mm/swap.c:1065
 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:59
 tlb_flush_mmu_free mm/mmu_gather.c:256 [inline]
 tlb_flush_mmu mm/mmu_gather.c:263 [inline]
 tlb_finish_mmu+0x147/0x7e0 mm/mmu_gather.c:363
 exit_mmap+0x1fe/0x7a0 mm/mmap.c:3098
 __mmput+0x128/0x4c0 kernel/fork.c:1188
 mmput+0x5c/0x70 kernel/fork.c:1210
 exit_mm kernel/exit.c:516 [inline]
 do_exit+0xa39/0x29a0 kernel/exit.c:807
 do_group_exit+0xd0/0x2a0 kernel/exit.c:950
 __do_sys_exit_group kernel/exit.c:961 [inline]
 __se_sys_exit_group kernel/exit.c:959 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:959
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888071805e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888071805f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888071805f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                               ^
 ffff888071806000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888071806080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================