syzbot

blkno = 8ed2c, nblocks = 1
ERROR: (device loop0): dbUpdatePMap: blocks are outside the map
ERROR: (device loop0): dbAlloc: the hint is outside the map
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:628:10
index 237 is out of range for type 'struct dtslot[128]'
CPU: 1 UID: 0 PID: 5822 Comm: syz-executor179 Not tainted 6.14.0-rc3-syzkaller-00166-g334426094588 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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
 dtSearch+0x1bde/0x2520 fs/jfs/jfs_dtree.c:628
 jfs_lookup+0x17f/0x410 fs/jfs/namei.c:1461
 lookup_one_qstr_excl+0x126/0x2b0 fs/namei.c:1693
 filename_create+0x297/0x540 fs/namei.c:4083
 do_mkdirat+0xbd/0x3a0 fs/namei.c:4328
 __do_sys_mkdir fs/namei.c:4356 [inline]
 __se_sys_mkdir fs/namei.c:4354 [inline]
 __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4354
 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: 0033:0x7f3549acd117
Code: ff ff 77 07 31 c0 c3 0f 1f 40 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 53 00 00 00 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:00007fff68fe9d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3549acd117
RDX: 0000000000004800 RSI: 00000000000001ff RDI: 0000400000000180
RBP: 0000400000000180 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fff68fe9e10 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff68fe9e10 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
---[ end trace ]---