==================================================================
BUG: KASAN: use-after-free in nilfs_find_entry+0x26c/0x5fc fs/nilfs2/dir.c:321
Read of size 2 at addr ffff0000f2ec4008 by task syz.2.3/6529

CPU: 0 UID: 0 PID: 6529 Comm: syz.2.3 Not tainted 6.12.0-syzkaller-g7b1d1d4cfac0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C)
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x198/0x538 mm/kasan/report.c:488
 kasan_report+0xd8/0x138 mm/kasan/report.c:601
 __asan_report_load2_noabort+0x20/0x2c mm/kasan/report_generic.c:379
 nilfs_find_entry+0x26c/0x5fc fs/nilfs2/dir.c:321
 nilfs_inode_by_name+0xac/0x224 fs/nilfs2/dir.c:394
 nilfs_lookup+0xdc/0x1d8 fs/nilfs2/namei.c:63
 lookup_one_qstr_excl+0x108/0x230 fs/namei.c:1633
 filename_create+0x230/0x468 fs/namei.c:4027
 do_mkdirat+0xac/0x574 fs/namei.c:4272
 __do_sys_mkdirat fs/namei.c:4295 [inline]
 __se_sys_mkdirat fs/namei.c:4293 [inline]
 __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4293
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x132ec4
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffdffc3cbb148 ffff0001b364f8b0 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f2ec3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f2ec3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000f2ec4000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                      ^
 ffff0000f2ec4080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000f2ec4100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
NILFS error (device loop2): nilfs_find_entry: zero-length directory entry
Remounting filesystem read-only
netlink: 8 bytes leftover after parsing attributes in process `syz.2.3'.
NILFS error (device loop2): nilfs_find_entry: zero-length directory entry