REISERFS warning (device loop3): vs-13060 reiserfs_update_sd_size: stat data of object [2 6 0x0 SD] (nlink == 1) not found (pos 1)
==================================================================
BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x1d4/0xb08 fs/reiserfs/lbalance.c:1017
Write of size 3936 at addr ffff0000feeaa140 by task syz.3.223/5266

CPU: 0 PID: 5266 Comm: syz.3.223 Not tainted 6.1.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x174/0x4c0 mm/kasan/report.c:427
 kasan_report+0xd4/0x130 mm/kasan/report.c:531
 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189
 memmove+0x60/0x90 mm/kasan/shadow.c:55
 leaf_paste_in_buffer+0x1d4/0xb08 fs/reiserfs/lbalance.c:1017
 leaf_copy_boundary_item+0x96c/0x1a34 fs/reiserfs/lbalance.c:199
 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline]
 leaf_move_items+0xa2c/0x1004 fs/reiserfs/lbalance.c:726
 leaf_shift_left+0xc8/0x39c fs/reiserfs/lbalance.c:750
 balance_leaf_paste_left_shift fs/reiserfs/do_balan.c:458 [inline]
 balance_leaf_paste_left fs/reiserfs/do_balan.c:592 [inline]
 balance_leaf_left fs/reiserfs/do_balan.c:613 [inline]
 balance_leaf+0x41c0/0xe860 fs/reiserfs/do_balan.c:1409
 do_balance+0x27c/0x788 fs/reiserfs/do_balan.c:1888
 reiserfs_paste_into_item+0x630/0x744 fs/reiserfs/stree.c:2159
 reiserfs_get_block+0x1a20/0x45d8 fs/reiserfs/inode.c:1069
 __block_write_begin_int+0x340/0x13b4 fs/buffer.c:1991
 __block_write_begin+0x7c/0xa0 fs/buffer.c:2041
 reiserfs_write_begin+0x328/0x71c fs/reiserfs/inode.c:2775
 generic_cont_expand_simple+0x160/0x258 fs/buffer.c:2347
 reiserfs_setattr+0x5c8/0x101c fs/reiserfs/inode.c:3305
 notify_change+0xb58/0xe1c fs/attr.c:499
 do_truncate+0x1c0/0x28c fs/open.c:65
 do_sys_ftruncate+0x288/0x31c fs/open.c:193
 __do_sys_ftruncate fs/open.c:204 [inline]
 __se_sys_ftruncate fs/open.c:202 [inline]
 __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the physical page:
page:00000000f5e7bd18 refcount:1 mapcount:1 mapping:0000000000000000 index:0xffff90370 pfn:0x13eeaa
memcg:ffff0000dbf68000
anon flags: 0x5ffe000000a0014(uptodate|lru|mappedtodisk|swapbacked|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffe000000a0014 fffffc0003f33f88 fffffc0003eb7188 ffff0000dd7d1bb1
raw: 0000000ffff90370 0000000000000000 0000000100000000 ffff0000dbf68000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000feeaa000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000feeaa080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000feeaa100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                           ^
 ffff0000feeaa180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000feeaa200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
Unable to handle kernel write to read-only memory at virtual address ffff00015da20000
KASAN: maybe wild-memory-access in range [0xfffc000aed100000-0xfffc000aed100007]
Mem abort info:
  ESR = 0x000000009600004f
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0