ERROR: (device loop8): dtReadFirst: stbl[0] out of bound
ERROR: (device loop8): remounting filesystem as read-only
------------[ 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: 8149 Comm: syz.8.203 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 ubsan_epilogue+0x14/0x48 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xd0/0xfc lib/ubsan.c:455
 dtSearch+0x1664/0x1d00 fs/jfs/jfs_dtree.c:784
 jfs_lookup+0x13c/0x32c fs/jfs/namei.c:1461
 __lookup_slow+0x254/0x378 fs/namei.c:1858
 lookup_slow+0x5c/0x80 fs/namei.c:1875
 walk_component fs/namei.c:2221 [inline]
 link_path_walk+0xaf8/0x152c fs/namei.c:2589
 path_openat+0x1d8/0x3114 fs/namei.c:4783
 do_filp_open+0x18c/0x36c fs/namei.c:4814
 do_sys_openat2+0x11c/0x1f0 fs/open.c:1430
 do_sys_open fs/open.c:1436 [inline]
 __do_sys_openat fs/open.c:1452 [inline]
 __se_sys_openat fs/open.c:1447 [inline]
 __arm64_sys_openat+0x120/0x158 fs/open.c:1447
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
---[ end trace ]---
ERROR: (device loop8): dtSearch: stack overrun!

btstack dump:
bn = 0, index = 0
bn = 20, index = 0
bn = 0, index = 0
bn = 20, index = 0
bn = 0, index = 0
bn = 20, index = 0
bn = 0, index = 0
bn = 0, index = 0
jfs_lookup: dtSearch returned -5