loop0: detected capacity change from 0 to 32768
jfs_unlink: dtDelete returned -5
ERROR: (device loop0): jfs_unlink: 
ERROR: (device loop0): remounting filesystem as read-only
jfs_lookup: dtSearch returned -5
jfs_lookup: dtSearch returned -5
jfs_lookup: dtSearch returned -5
jfs_lookup: dtSearch returned -5
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:3089:20
index -1 is out of range for type 'struct dtslot[128]'
CPU: 0 UID: 0 PID: 5325 Comm: syz.0.0 Not tainted 6.12.0-rc5-syzkaller-00322-gb9021de3ec2f #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:429
 dtReadFirst+0x612/0xbe0 fs/jfs/jfs_dtree.c:3089
 jfs_readdir+0x817/0x4660 fs/jfs/jfs_dtree.c:2820
 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65
 iterate_dir+0x571/0x800 fs/readdir.c:108
 __do_sys_getdents fs/readdir.c:324 [inline]
 __se_sys_getdents+0x1ef/0x4d0 fs/readdir.c:309
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3923f7e719
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3924d95038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f3924135f80 RCX: 00007f3923f7e719
RDX: 0000000000000068 RSI: 0000000020000300 RDI: 0000000000000009
RBP: 00007f3923ff132e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3924135f80 R15: 00007ffea9da7338
 </TASK>
---[ end trace ]---