REISERFS (device loop6): checking transaction log (loop6)
REISERFS (device loop6): Using r5 hash to sort names
==================================================================
BUG: KASAN: out-of-bounds in leaf_paste_entries+0x73c/0x10c0 fs/reiserfs/lbalance.c:1377
Read of size 18446744073709551584 at addr ffff88804e26afa4 by task syz.6.1005/9406

CPU: 0 PID: 9406 Comm: syz.6.1005 Not tainted 5.15.186-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189
 memmove+0x25/0x60 mm/kasan/shadow.c:54
 leaf_paste_entries+0x73c/0x10c0 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+0xacec/0x10e60 fs/reiserfs/do_balan.c:1452
 do_balance+0x2fa/0x930 fs/reiserfs/do_balan.c:1888
 reiserfs_paste_into_item+0x69b/0x7e0 fs/reiserfs/stree.c:2159
 reiserfs_add_entry+0x975/0xd40 fs/reiserfs/namei.c:567
 reiserfs_mkdir+0x68f/0x970 fs/reiserfs/namei.c:862
 xattr_mkdir fs/reiserfs/xattr.c:76 [inline]
 create_privroot fs/reiserfs/xattr.c:889 [inline]
 reiserfs_xattr_init+0x331/0x720 fs/reiserfs/xattr.c:1012
 reiserfs_fill_super+0x1fa6/0x23e0 fs/reiserfs/super.c:2179
 mount_bdev+0x287/0x3c0 fs/super.c:1400
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x24a/0xa40 fs/namespace.c:3014
 do_mount fs/namespace.c:3357 [inline]
 __do_sys_mount fs/namespace.c:3565 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3542
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4e299f70ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4e2785ce68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4e2785cef0 RCX: 00007f4e299f70ca
RDX: 0000200000000000 RSI: 00002000000000c0 RDI: 00007f4e2785ceb0
RBP: 0000200000000000 R08: 00007f4e2785cef0 R09: 0000000000008488
R10: 0000000000008488 R11: 0000000000000246 R12: 00002000000000c0
R13: 00007f4e2785ceb0 R14: 00000000000010f9 R15: 0000200000000780
 </TASK>

The buggy address belongs to the page:
page:ffffea0001389a80 refcount:2 mapcount:0 mapping:ffff8881408d2030 index:0x213 pfn:0x4e26a
memcg:ffff88805b6d0000
aops:def_blk_aops ino:700006
flags: 0xfff00000002032(referenced|lru|active|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002032 ffffea0001389bc8 ffff88807dc73030 ffff8881408d2030
raw: 0000000000000213 ffff8880550169f8 00000002ffffffff ffff88805b6d0000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 9406, ts 454028873556, free_ts 454027917232
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5474
 __page_cache_alloc+0xd2/0x3f0 mm/filemap.c:1022
 pagecache_get_page+0x986/0xef0 mm/filemap.c:1940
 find_or_create_page include/linux/pagemap.h:420 [inline]
 grow_dev_page fs/buffer.c:949 [inline]
 grow_buffers fs/buffer.c:1014 [inline]
 __getblk_slow fs/buffer.c:1041 [inline]
 __getblk_gfp+0x249/0xb70 fs/buffer.c:1336
 sb_getblk include/linux/buffer_head.h:361 [inline]
 search_by_key+0x424/0x4390 fs/reiserfs/stree.c:672
 reiserfs_read_locked_inode+0x154/0x2620 fs/reiserfs/inode.c:1557
 reiserfs_fill_super+0x124b/0x23e0 fs/reiserfs/super.c:2075
 mount_bdev+0x287/0x3c0 fs/super.c:1400
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x24a/0xa40 fs/namespace.c:3014
 do_mount fs/namespace.c:3357 [inline]
 __do_sys_mount fs/namespace.c:3565 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3542
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
 free_unref_page_list+0x122/0x7e0 mm/page_alloc.c:3433
 release_pages+0x184b/0x1bb0 mm/swap.c:963
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu mm/mmu_gather.c:247 [inline]
 tlb_finish_mmu+0x164/0x2e0 mm/mmu_gather.c:338
 unmap_region+0x315/0x360 mm/mmap.c:2665
 __do_munmap+0x9d3/0xdc0 mm/mmap.c:2895
 __vm_munmap+0x137/0x230 mm/mmap.c:2948
 __do_sys_munmap mm/mmap.c:2974 [inline]
 __se_sys_munmap mm/mmap.c:2970 [inline]
 __x64_sys_munmap+0x67/0x70 mm/mmap.c:2970
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Memory state around the buggy address:
 ffff88804e26ae80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804e26af00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88804e26af80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                               ^
 ffff88804e26b000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804e26b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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