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+0x9b8/0x1440 fs/reiserfs/lbalance.c:1377
Read of size 18446744073709551584 at addr ffff88807076efa4 by task syz-executor809/3605

CPU: 1 PID: 3605 Comm: syz-executor809 Not tainted 6.0.0-syzkaller-07362-g62e6e5940c0c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 print_address_description+0x65/0x4b0 mm/kasan/report.c:317
 print_report+0x108/0x1f0 mm/kasan/report.c:433
 kasan_report+0xc3/0xf0 mm/kasan/report.c:495
 kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189
 memmove+0x25/0x60 mm/kasan/shadow.c:54
 leaf_paste_entries+0x9b8/0x1440 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+0xbbf3/0x123a0 fs/reiserfs/do_balan.c:1452
 do_balance+0x2d6/0x8d0 fs/reiserfs/do_balan.c:1888
 reiserfs_paste_into_item+0x740/0x880 fs/reiserfs/stree.c:2159
 reiserfs_add_entry+0xa26/0xef0 fs/reiserfs/namei.c:567
 reiserfs_mkdir+0x682/0x8b0 fs/reiserfs/namei.c:860
 xattr_mkdir fs/reiserfs/xattr.c:76 [inline]
 create_privroot fs/reiserfs/xattr.c:882 [inline]
 reiserfs_xattr_init+0x34b/0x730 fs/reiserfs/xattr.c:1005
 reiserfs_fill_super+0x20b5/0x24a0 fs/reiserfs/super.c:2177
 mount_bdev+0x26c/0x3a0 fs/super.c:1400
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7faff83c635a
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:00007ffda31488c8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007faff83c635a
RDX: 0000000020000000 RSI: 0000000020000180 RDI: 00007ffda31488e0
RBP: 00007ffda31488e0 R08: 00007ffda3148920 R09: 00005555569772c0
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000004
R13: 00007ffda3148920 R14: 0000000000000006 R15: 0000000020000290
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001c1db80 refcount:3 mapcount:0 mapping:ffff88801240dff8 index:0x213 pfn:0x7076e
memcg:ffff888140148000
aops:def_blk_aops ino:700000
flags: 0xfff00000002022(referenced|active|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002022 0000000000000000 dead000000000122 ffff88801240dff8
raw: 0000000000000213 ffff888074375bc8 00000003ffffffff ffff888140148000
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 3605, tgid 3605 (syz-executor809), ts 38278114717, free_ts 32792070512
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549
 folio_alloc+0x1a/0x50 mm/mempolicy.c:2280
 filemap_alloc_folio+0x7e/0x1c0 mm/filemap.c:970
 __filemap_get_folio+0x888/0x1250 mm/filemap.c:1970
 pagecache_get_page+0x2a/0x240 mm/folio-compat.c:104
 find_or_create_page include/linux/pagemap.h:613 [inline]
 grow_dev_page+0xba/0x920 fs/buffer.c:946
 grow_buffers fs/buffer.c:1011 [inline]
 __getblk_slow fs/buffer.c:1038 [inline]
 __getblk_gfp+0x16c/0x290 fs/buffer.c:1333
 sb_getblk include/linux/buffer_head.h:363 [inline]
 search_by_key+0x405/0x45b0 fs/reiserfs/stree.c:672
 reiserfs_read_locked_inode+0x223/0x2990 fs/reiserfs/inode.c:1549
 reiserfs_fill_super+0x128a/0x24a0 fs/reiserfs/super.c:2073
 mount_bdev+0x26c/0x3a0 fs/super.c:1400
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1449 [inline]
 free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499
 free_unref_page_prepare mm/page_alloc.c:3380 [inline]
 free_unref_page_list+0xb4/0x7b0 mm/page_alloc.c:3522
 release_pages+0x22c3/0x2540 mm/swap.c:1012
 tlb_batch_pages_flush mm/mmu_gather.c:58 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:255 [inline]
 tlb_flush_mmu+0x850/0xa70 mm/mmu_gather.c:262
 tlb_finish_mmu+0xcb/0x200 mm/mmu_gather.c:353
 exit_mmap+0x1cb/0x520 mm/mmap.c:3118
 __mmput+0x111/0x3a0 kernel/fork.c:1187
 exit_mm+0x1ef/0x2c0 kernel/exit.c:510
 do_exit+0x4e1/0x20a0 kernel/exit.c:782
 do_group_exit+0x23b/0x2f0 kernel/exit.c:925
 __do_sys_exit_group kernel/exit.c:936 [inline]
 __se_sys_exit_group kernel/exit.c:934 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:934
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88807076ee80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807076ef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807076ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                               ^
 ffff88807076f000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807076f080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================