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 r5 hash to sort names
reiserfs: enabling write barrier flush mode
==================================================================
BUG: KASAN: out-of-bounds in leaf_paste_entries+0x95f/0x13a0 fs/reiserfs/lbalance.c:1377
Read of size 18446744073709551584 at addr ffff888071f52fa4 by task syz-executor.0/5462

CPU: 0 PID: 5462 Comm: syz-executor.0 Not tainted 6.6.0-rc1-syzkaller-00196-g57d88e8a5974 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x15f/0x540 mm/kasan/report.c:475
 kasan_report+0x171/0x1b0 mm/kasan/report.c:588
 kasan_check_range+0x27a/0x290 mm/kasan/generic.c:187
 __asan_memmove+0x25/0x60 mm/kasan/shadow.c:94
 leaf_paste_entries+0x95f/0x13a0 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+0xbd1e/0x12510 fs/reiserfs/do_balan.c:1452
 do_balance+0x309/0x8f0 fs/reiserfs/do_balan.c:1888
 reiserfs_paste_into_item+0x72e/0x870 fs/reiserfs/stree.c:2157
 reiserfs_add_entry+0x9b8/0xd50 fs/reiserfs/namei.c:565
 reiserfs_mkdir+0x6bc/0x8f0 fs/reiserfs/namei.c:860
 xattr_mkdir fs/reiserfs/xattr.c:77 [inline]
 create_privroot fs/reiserfs/xattr.c:891 [inline]
 reiserfs_xattr_init+0x31f/0x670 fs/reiserfs/xattr.c:1007
 reiserfs_remount+0x12b8/0x18e0 fs/reiserfs/super.c:1586
 reconfigure_super+0x43c/0x870 fs/super.c:1140
 do_remount fs/namespace.c:2882 [inline]
 path_mount+0xc20/0xfa0 fs/namespace.c:3654
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3861
 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: 0033:0x7f4572a7e1ea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f45738a7ee8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f45738a7f80 RCX: 00007f4572a7e1ea
RDX: 00000000200000c0 RSI: 0000000020000100 RDI: 0000000000000000
RBP: 00000000200000c0 R08: 00007f45738a7f80 R09: 0000000001a484bc
R10: 0000000001a484bc R11: 0000000000000246 R12: 0000000020000100
R13: 00007f45738a7f40 R14: 0000000000000000 R15: 0000000020000d80
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001c7d480 refcount:2 mapcount:0 mapping:ffff888148894d78 index:0x213 pfn:0x71f52
memcg:ffff88807c730000
aops:def_blk_aops ino:700000
flags: 0xfff38000008224(referenced|lru|workingset|private|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff38000008224 ffffea0001c7f788 ffffea0001f9fd08 ffff888148894d78
raw: 0000000000000213 ffff8880689afbc8 00000002ffffffff ffff88807c730000
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 5462, tgid 5461 (syz-executor.0), ts 84878738652, free_ts 84783196678
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1d2/0x1f0 mm/page_alloc.c:1536
 prep_new_page mm/page_alloc.c:1543 [inline]
 get_page_from_freelist+0x31b7/0x3330 mm/page_alloc.c:3170
 __alloc_pages+0x251/0x660 mm/page_alloc.c:4426
 folio_alloc+0x1a/0x50 mm/mempolicy.c:2308
 filemap_alloc_folio+0xda/0x4f0 mm/filemap.c:976
 __filemap_get_folio+0x429/0xb90 mm/filemap.c:1936
 grow_dev_page fs/buffer.c:1058 [inline]
 grow_buffers fs/buffer.c:1118 [inline]
 __getblk_slow fs/buffer.c:1145 [inline]
 __getblk_gfp+0x214/0x630 fs/buffer.c:1439
 sb_getblk include/linux/buffer_head.h:341 [inline]
 search_by_key+0x460/0x4b60 fs/reiserfs/stree.c:672
 reiserfs_read_locked_inode+0x23c/0x2950 fs/reiserfs/inode.c:1547
 reiserfs_fill_super+0x135f/0x2620 fs/reiserfs/super.c:2071
 mount_bdev+0x233/0x300 fs/super.c:1629
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:638
 vfs_get_tree+0x88/0x280 fs/super.c:1750
 do_new_mount+0x28b/0xae0 fs/namespace.c:3335
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1136 [inline]
 free_unref_page_prepare+0x8ae/0x9d0 mm/page_alloc.c:2312
 free_unref_page_list+0x58e/0x830 mm/page_alloc.c:2451
 release_pages+0x26e2/0x2a00 mm/swap.c:1042
 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:293 [inline]
 tlb_flush_mmu+0x348/0x4d0 mm/mmu_gather.c:300
 tlb_finish_mmu+0xd0/0x1f0 mm/mmu_gather.c:392
 exit_mmap+0x4cf/0xc20 mm/mmap.c:3223
 __mmput+0x115/0x3c0 kernel/fork.c:1349
 exit_mm+0x21b/0x2f0 kernel/exit.c:567
 do_exit+0x60e/0x2280 kernel/exit.c:861
 do_group_exit+0x202/0x2b0 kernel/exit.c:1024
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1033
 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:
 ffff888071f52e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888071f52f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888071f52f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                               ^
 ffff888071f53000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888071f53080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================