mount with iocharset=utf8 to access
UFO tlock:0xffffc9000295a1f8
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:784:21
index -1 is out of range for type 'struct dtslot[128]'
CPU: 1 UID: 0 PID: 5825 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x40 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xe9/0xf0 lib/ubsan.c:455
 dtSearch+0x1a66/0x21b0 fs/jfs/jfs_dtree.c:784
 dtDelete+0xe6/0x2c60 fs/jfs/jfs_dtree.c:2102
 jfs_unlink+0x29c/0xa20 fs/jfs/namei.c:502
 vfs_unlink+0x380/0x640 fs/namei.c:5338
 do_unlinkat+0x2cf/0x560 fs/namei.c:5408
 __do_sys_unlink fs/namei.c:5443 [inline]
 __se_sys_unlink fs/namei.c:5441 [inline]
 __x64_sys_unlink+0x47/0x50 fs/namei.c:5441
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe462b8ecf7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 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:00007ffcc82d8178 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe462b8ecf7
RDX: 00007ffcc82d81a0 RSI: 00007ffcc82d8230 RDI: 00007ffcc82d8230
RBP: 00007ffcc82d8230 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffcc82d9320
R13: 00007fe462c13d7d R14: 0000000000017eee R15: 00007ffcc82da3f0
 </TASK>
---[ end trace ]---