REISERFS warning (device loop2): vs-13060 reiserfs_update_sd_size: stat data of object [2 5 0x0 SD] (nlink == 1) not found (pos 1)
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BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x1e0/0xbd0 fs/reiserfs/lbalance.c:1017
Write of size 432 at addr ffff888057900f10 by task syz.2.1138/9080

CPU: 0 PID: 9080 Comm: syz.2.1138 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xac/0x220 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x288/0x290 mm/kasan/generic.c:187
 __asan_memmove+0x40/0x70 mm/kasan/shadow.c:95
 leaf_paste_in_buffer+0x1e0/0xbd0 fs/reiserfs/lbalance.c:1017
 balance_leaf_paste_left_shift fs/reiserfs/do_balan.c:465 [inline]
 balance_leaf_paste_left fs/reiserfs/do_balan.c:592 [inline]
 balance_leaf_left fs/reiserfs/do_balan.c:613 [inline]
 balance_leaf+0xb994/0x10da0 fs/reiserfs/do_balan.c:1409
 do_balance+0x2fe/0x940 fs/reiserfs/do_balan.c:1888
 reiserfs_paste_into_item+0x6a1/0x7f0 fs/reiserfs/stree.c:2157
 reiserfs_get_block+0x1bd3/0x3ed0 fs/reiserfs/inode.c:1069
 __block_write_begin_int+0x566/0x1ad0 fs/buffer.c:2124
 reiserfs_write_begin+0x20a/0x4c0 fs/reiserfs/inode.c:2771
 generic_cont_expand_simple+0x13a/0x200 fs/buffer.c:2482
 reiserfs_setattr+0x58f/0x11a0 fs/reiserfs/inode.c:3302
 notify_change+0xb0d/0xe10 fs/attr.c:499
 do_truncate+0x19b/0x220 fs/open.c:66
 do_sys_ftruncate+0x325/0x3d0 fs/open.c:194
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb31c18f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fb31d030038 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007fb31c3e5fa0 RCX: 00007fb31c18f749
RDX: 0000000000000000 RSI: 0000000002000009 RDI: 0000000000000006
RBP: 00007fb31c213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb31c3e6038 R14: 00007fb31c3e5fa0 R15: 00007ffc6d320718
 </TASK>

The buggy address belongs to the physical page:
page:ffffea00015e4000 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x57900
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea00015e4fc8 ffffea000148a008 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 9070, tgid 9069 (syz.3.1131), ts 313600739591, free_ts 313600809243
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
 prep_new_page mm/page_alloc.c:1561 [inline]
 get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
 folio_alloc+0x1e/0x30 mm/mempolicy.c:2291
 filemap_alloc_folio+0xdf/0x470 mm/filemap.c:1004
 __filemap_get_folio+0x3ee/0xbc0 mm/filemap.c:1962
 pagecache_get_page+0x2a/0x250 mm/folio-compat.c:99
 f2fs_convert_inline_inode+0x626/0x7f0 fs/f2fs/inline.c:234
 f2fs_setattr+0xae4/0x1360 fs/f2fs/file.c:1070
 notify_change+0xb0d/0xe10 fs/attr.c:499
 do_truncate+0x19b/0x220 fs/open.c:66
 vfs_truncate+0x266/0x300 fs/open.c:112
 do_sys_truncate+0xe0/0x1a0 fs/open.c:135
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1154 [inline]
 free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
 free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2475
 release_pages+0x1fa0/0x2220 mm/swap.c:1022
 __folio_batch_release+0x71/0xe0 mm/swap.c:1042
 folio_batch_release include/linux/pagevec.h:83 [inline]
 truncate_inode_pages_range+0x358/0xf00 mm/truncate.c:396
 f2fs_zero_post_eof_page fs/f2fs/file.c:53 [inline]
 f2fs_setattr+0xc3f/0x1360 fs/f2fs/file.c:1086
 notify_change+0xb0d/0xe10 fs/attr.c:499
 do_truncate+0x19b/0x220 fs/open.c:66
 vfs_truncate+0x266/0x300 fs/open.c:112
 do_sys_truncate+0xe0/0x1a0 fs/open.c:135
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff888057900e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888057900e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888057900f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                         ^
 ffff888057900f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888057901000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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