------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/nilfs2/dir.c:257:18
index 15 is out of range for type 'unsigned char[15]'
CPU: 1 PID: 5063 Comm: syz-executor290 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:415
 nilfs_set_de_type fs/nilfs2/dir.c:257 [inline]
 nilfs_add_link+0xb39/0xb80 fs/nilfs2/dir.c:501
 nilfs_link+0x136/0x220 fs/nilfs2/namei.c:192
 vfs_link+0x4f5/0x690 fs/namei.c:4608
 do_linkat+0x356/0x760 fs/namei.c:4679
 __do_sys_linkat fs/namei.c:4707 [inline]
 __se_sys_linkat fs/namei.c:4704 [inline]
 __x64_sys_linkat+0xdd/0xf0 fs/namei.c:4704
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fa0356fc679
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd8d2dea18 EFLAGS: 00000246 ORIG_RAX: 0000000000000109
RAX: ffffffffffffffda RBX: 00007ffd8d2debe8 RCX: 00007fa0356fc679
RDX: 0000000000000004 RSI: 0000000020000180 RDI: 0000000000000004
RBP: 00007fa035770610 R08: 0000000000000000 R09: 00007ffd8d2debe8
R10: 0000000020000640 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd8d2debd8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
---[ end trace ]---