mount with iocharset=utf8 to access
UFO tlock:0xffffc90002c7a090
------------[ 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: 0 UID: 0 PID: 10490 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 ubsan_epilogue+0xa/0x40
 __ubsan_handle_out_of_bounds+0xe9/0xf0
 dtSearch+0x1a66/0x21b0
 dtDelete+0xe6/0x2c60
 jfs_unlink+0x29c/0xa20
 vfs_unlink+0x394/0x650
 do_unlinkat+0x345/0x560
 __x64_sys_unlink+0x47/0x50
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff12498e577
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:00007ffd2046f9e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff12498e577
RDX: 00007ffd2046fa10 RSI: 00007ffd2046faa0 RDI: 00007ffd2046faa0
RBP: 00007ffd2046faa0 R08: 000000000000fafe R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffd20470b90
R13: 00007ff124a11d7d R14: 000000000003ab46 R15: 00007ffd20471c60
 </TASK>
---[ end trace ]---
