loop4: detected capacity change from 0 to 32768
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:1601:21
index 26 is out of range for type 'lv [20]'
CPU: 0 UID: 0 PID: 6025 Comm: syz.4.35 Not tainted 6.15.0-rc6-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0x11c/0x160 lib/ubsan.c:453
 dtSplitPage+0x3229/0x39e0 fs/jfs/jfs_dtree.c:1601
 dtSplitUp+0x7ba/0x5970 fs/jfs/jfs_dtree.c:1092
 dtInsert+0x8dd/0xb60 fs/jfs/jfs_dtree.c:871
 jfs_rename+0x10a4/0x1820 fs/jfs/namei.c:1225
 vfs_rename+0xf64/0x2250 fs/namei.c:5121
 do_renameat2+0x82b/0xc90 fs/namei.c:5270
 __do_sys_rename fs/namei.c:5317 [inline]
 __se_sys_rename fs/namei.c:5315 [inline]
 __x64_sys_rename+0x7d/0xa0 fs/namei.c:5315
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f32eb38e969
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:00007f32ec16d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f32eb5b5fa0 RCX: 00007f32eb38e969
RDX: 0000000000000000 RSI: 0000200000000f40 RDI: 0000200000000300
RBP: 00007f32eb410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f32eb5b5fa0 R15: 00007ffe9079c9b8
 </TASK>
---[ end trace ]---