unable to read i-node block
==================================================================
BUG: KASAN: use-after-free in sysv_new_block+0x618/0x7e4 fs/sysv/balloc.c:113
Read of size 4 at addr ffff0000ed7960c8 by task syz.2.39/4334

CPU: 0 PID: 4334 Comm: syz.2.39 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 __asan_report_load4_noabort+0x44/0x50 mm/kasan/report_generic.c:308
 sysv_new_block+0x618/0x7e4 fs/sysv/balloc.c:113
 alloc_branch fs/sysv/itree.c:134 [inline]
 get_block+0x258/0x1390 fs/sysv/itree.c:253
 __block_write_begin_int+0x3ec/0x1608 fs/buffer.c:2012
 __block_write_begin fs/buffer.c:2062 [inline]
 block_write_begin+0x60/0xdc fs/buffer.c:2122
 sysv_write_begin+0x50/0x98 fs/sysv/itree.c:487
 generic_perform_write+0x24c/0x520 mm/filemap.c:3785
 __generic_file_write_iter+0x230/0x454 mm/filemap.c:3912
 generic_file_write_iter+0xb4/0x1b8 mm/filemap.c:3944
 __kernel_write+0x488/0x8b8 fs/read_write.c:539
 __dump_emit+0x200/0x338 fs/coredump.c:875
 dump_emit+0x288/0x36c fs/coredump.c:912
 elf_core_dump+0x2598/0x3640 fs/binfmt_elf.c:2237
 do_coredump+0x12c8/0x2890 fs/coredump.c:826
 get_signal+0x3dc/0x1550 kernel/signal.c:2886
 do_signal arch/arm64/kernel/signal.c:890 [inline]
 do_notify_resume+0x320/0x32b8 arch/arm64/kernel/signal.c:943
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
 el0_da+0x118/0x20c arch/arm64/kernel/entry-common.c:495
 el0t_64_sync_handler+0xc0/0xe4 arch/arm64/kernel/entry-common.c:629
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the page:
page:000000006a1e4923 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12d796
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc0003b5e5c8 fffffc0003b5e548 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ed795f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000ed796000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000ed796080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff0000ed796100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000ed796180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================