loop9: detected capacity change from 0 to 32768
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:3660:9
index 27 is out of range for type 'struct lv[20]'
CPU: 1 UID: 0 PID: 26020 Comm: syz.9.2667 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS G[ 1929.993991][T26020] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xe8/0xf0 lib/ubsan.c:455
 dtInsertEntry+0x106d/0x1430 fs/jfs/jfs_dtree.c:3660
 dtSplitPage+0x290b/0x37c0 fs/jfs/jfs_dtree.c:1596
 dtSplitUp fs/jfs/jfs_dtree.c:1092 [inline]
 dtInsert+0x10a4/0x5f10 fs/jfs/jfs_dtree.c:871
 jfs_mknod+0x6bd/0x9d0 fs/jfs/namei.c:1413
 vfs_mknod+0x44e/0x620 fs/namei.c:5098
 filename_mknodat+0x3cf/0x670 fs/namei.c:-1
 __do_sys_mknod fs/namei.c:5185 [inline]
 __se_sys_mknod+0x3a/0x150 fs/namei.c:5182
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feb94bec819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007feb92e46028 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007feb94e65fa0 RCX: 00007feb94bec819
RDX: 0000000000000712 RSI: 0000000000001000 RDI: 0000200000000180
RBP: 00007feb94c82c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007feb94e66038 R14: 00007feb94e65fa0 R15: 00007ffe2326aa08
 </TASK>
---[ end trace ]---