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+0x963/0x13a0 fs/reiserfs/lbalance.c:1377
Read of size 18446744073709551584 at addr ffff888073fe1fa4 by task syz-executor896/4993

CPU: 0 PID: 4993 Comm: syz-executor896 Not tainted 6.4.0-rc4-syzkaller-00031-g8b817fded42d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:351 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:462
 kasan_report+0x176/0x1b0 mm/kasan/report.c:572
 kasan_check_range+0x283/0x290 mm/kasan/generic.c:187
 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94
 leaf_paste_entries+0x963/0x13a0 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+0xbd22/0x12510 fs/reiserfs/do_balan.c:1452
 do_balance+0x30d/0x8f0 fs/reiserfs/do_balan.c:1888
 reiserfs_paste_into_item+0x732/0x870 fs/reiserfs/stree.c:2157
 reiserfs_add_entry+0x9bc/0xd70 fs/reiserfs/namei.c:565
 reiserfs_mkdir+0x6c0/0x8f0 fs/reiserfs/namei.c:860
 xattr_mkdir fs/reiserfs/xattr.c:77 [inline]
 create_privroot fs/reiserfs/xattr.c:890 [inline]
 reiserfs_xattr_init+0x323/0x670 fs/reiserfs/xattr.c:1006
 reiserfs_fill_super+0x2207/0x2620 fs/reiserfs/super.c:2175
 mount_bdev+0x2d0/0x3f0 fs/super.c:1380
 legacy_get_tree+0xef/0x190 fs/fs_context.c:610
 vfs_get_tree+0x8c/0x270 fs/super.c:1510
 do_new_mount+0x28f/0xae0 fs/namespace.c:3039
 do_mount fs/namespace.c:3382 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5928326b0a
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:00007fff4d8c1538 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5928326b0a
RDX: 0000000020001100 RSI: 0000000020000040 RDI: 00007fff4d8c1550
RBP: 00007fff4d8c1550 R08: 00007fff4d8c1590 R09: 00000000000010f0
R10: 0000000000000080 R11: 0000000000000286 R12: 0000000000000004
R13: 00005555570272c0 R14: 0000000000000080 R15: 00007fff4d8c1590
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001cff840 refcount:3 mapcount:0 mapping:ffff8881489749e8 index:0x213 pfn:0x73fe1
memcg:ffff888015a54000
aops:def_blk_aops ino:700000
flags: 0xfff00000002022(referenced|active|private|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000002022 0000000000000000 dead000000000122 ffff8881489749e8
raw: 0000000000000213 ffff888075e64570 00000003ffffffff ffff888015a54000
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 4993, tgid 4993 (syz-executor896), ts 65483200264, free_ts 58740132115
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1731
 prep_new_page mm/page_alloc.c:1738 [inline]
 get_page_from_freelist+0x321c/0x33a0 mm/page_alloc.c:3502
 __alloc_pages+0x255/0x670 mm/page_alloc.c:4768
 folio_alloc+0x1e/0x60 mm/mempolicy.c:2289
 filemap_alloc_folio+0xde/0x500 mm/filemap.c:976
 __filemap_get_folio+0x323/0xa00 mm/filemap.c:1965
 pagecache_get_page+0x2e/0x220 mm/folio-compat.c:99
 find_or_create_page include/linux/pagemap.h:635 [inline]
 grow_dev_page fs/buffer.c:995 [inline]
 grow_buffers fs/buffer.c:1060 [inline]
 __getblk_slow fs/buffer.c:1087 [inline]
 __getblk_gfp+0x211/0xcc0 fs/buffer.c:1382
 sb_getblk include/linux/buffer_head.h:365 [inline]
 search_by_key+0x464/0x4b60 fs/reiserfs/stree.c:672
 reiserfs_read_locked_inode+0x240/0x2950 fs/reiserfs/inode.c:1549
 reiserfs_fill_super+0x1363/0x2620 fs/reiserfs/super.c:2071
 mount_bdev+0x2d0/0x3f0 fs/super.c:1380
 legacy_get_tree+0xef/0x190 fs/fs_context.c:610
 vfs_get_tree+0x8c/0x270 fs/super.c:1510
 do_new_mount+0x28f/0xae0 fs/namespace.c:3039
 do_mount fs/namespace.c:3382 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d9/0x3c0 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:1302 [inline]
 free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2564
 free_unref_page_list+0x596/0x830 mm/page_alloc.c:2705
 release_pages+0x2193/0x2470 mm/swap.c:1042
 tlb_batch_pages_flush mm/mmu_gather.c:97 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline]
 tlb_flush_mmu+0x100/0x210 mm/mmu_gather.c:299
 tlb_finish_mmu+0xd4/0x1f0 mm/mmu_gather.c:391
 unmap_region+0x258/0x2a0 mm/mmap.c:2222
 do_vmi_align_munmap+0x1123/0x1820 mm/mmap.c:2473
 do_vmi_munmap+0x24a/0x2b0 mm/mmap.c:2530
 __vm_munmap+0x226/0x470 mm/mmap.c:2805
 __do_sys_munmap mm/mmap.c:2830 [inline]
 __se_sys_munmap mm/mmap.c:2827 [inline]
 __x64_sys_munmap+0x69/0x80 mm/mmap.c:2827
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888073fe1e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888073fe1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888073fe1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                               ^
 ffff888073fe2000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888073fe2080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================