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 (device loop0): using 3.5.x disk format
==================================================================
BUG: KASAN: out-of-bounds in leaf_paste_entries+0x95f/0x13a0 fs/reiserfs/lbalance.c:1377
Read of size 18446744073709551584 at addr ffff888071772fa4 by task syz-executor401/3510

CPU: 0 PID: 3510 Comm: syz-executor401 Not tainted 6.1.45-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:395
 kasan_report+0x136/0x160 mm/kasan/report.c:495
 kasan_check_range+0x27f/0x290 mm/kasan/generic.c:189
 memmove+0x25/0x60 mm/kasan/shadow.c:54
 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+0x73b/0x880 fs/reiserfs/stree.c:2159
 reiserfs_add_entry+0x9b8/0xd70 fs/reiserfs/namei.c:567
 reiserfs_mkdir+0x6bc/0x8f0 fs/reiserfs/namei.c:862
 xattr_mkdir fs/reiserfs/xattr.c:76 [inline]
 create_privroot fs/reiserfs/xattr.c:882 [inline]
 reiserfs_xattr_init+0x348/0x730 fs/reiserfs/xattr.c:1005
 reiserfs_fill_super+0x2203/0x2620 fs/reiserfs/super.c:2175
 mount_bdev+0x2c9/0x3f0 fs/super.c:1432
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1562
 do_new_mount+0x28b/0xae0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d5/0x3c0 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: 0033:0x7f67a31f18ba
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe6ecc6f78 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe6ecc6f90 RCX: 00007f67a31f18ba
RDX: 0000000020001100 RSI: 0000000020000040 RDI: 00007ffe6ecc6f90
RBP: 0000000000000004 R08: 00007ffe6ecc6fd0 R09: 00000000000010fb
R10: 0000000000000080 R11: 0000000000000286 R12: 0000000000000080
R13: 00007ffe6ecc6fd0 R14: 0000000000000003 R15: 0000000000400000
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001c5dc80 refcount:3 mapcount:0 mapping:ffff8880128887f8 index:0x213 pfn:0x71772
memcg:ffff88813fe40000
aops:def_blk_aops ino:700000
flags: 0xfff18000002042(referenced|workingset|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff18000002042 0000000000000000 dead000000000122 ffff8880128887f8
raw: 0000000000000213 ffff88807001a3a0 00000003ffffffff ffff88813fe40000
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 3510, tgid 3510 (syz-executor401), ts 58510349626, free_ts 50546657161
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2533
 prep_new_page mm/page_alloc.c:2540 [inline]
 get_page_from_freelist+0x32ed/0x3480 mm/page_alloc.c:4292
 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5559
 folio_alloc+0x1a/0x50 mm/mempolicy.c:2290
 filemap_alloc_folio+0xda/0x4f0 mm/filemap.c:971
 __filemap_get_folio+0x711/0xe30 mm/filemap.c:1965
 pagecache_get_page+0x28/0x250 mm/folio-compat.c:110
 find_or_create_page include/linux/pagemap.h:613 [inline]
 grow_dev_page fs/buffer.c:946 [inline]
 grow_buffers fs/buffer.c:1011 [inline]
 __getblk_slow fs/buffer.c:1038 [inline]
 __getblk_gfp+0x211/0xa20 fs/buffer.c:1333
 sb_getblk include/linux/buffer_head.h:356 [inline]
 search_by_key+0x460/0x4b60 fs/reiserfs/stree.c:672
 reiserfs_read_locked_inode+0x23c/0x2950 fs/reiserfs/inode.c:1549
 reiserfs_fill_super+0x135f/0x2620 fs/reiserfs/super.c:2071
 mount_bdev+0x2c9/0x3f0 fs/super.c:1432
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1562
 do_new_mount+0x28b/0xae0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d5/0x3c0 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:1460 [inline]
 free_pcp_prepare mm/page_alloc.c:1510 [inline]
 free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3388
 free_unref_page_list+0x107/0x810 mm/page_alloc.c:3530
 release_pages+0x2836/0x2b40 mm/swap.c:1055
 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:254 [inline]
 tlb_flush_mmu+0xfc/0x210 mm/mmu_gather.c:261
 tlb_finish_mmu+0xce/0x1f0 mm/mmu_gather.c:361
 unmap_region+0x29f/0x2f0 mm/mmap.c:2319
 do_mas_align_munmap+0xe93/0x15c0 mm/mmap.c:2569
 do_mas_munmap+0x246/0x2b0 mm/mmap.c:2627
 __vm_munmap+0x268/0x370 mm/mmap.c:2904
 __do_sys_munmap mm/mmap.c:2929 [inline]
 __se_sys_munmap mm/mmap.c:2926 [inline]
 __x64_sys_munmap+0x5c/0x70 mm/mmap.c:2926
 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:
 ffff888071772e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888071772f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888071772f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                               ^
 ffff888071773000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888071773080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================