loop1: detected capacity change from 0 to 32768 ================================================================================ UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:3944:9 index 27 is out of range for type 'struct lv[20]' CPU: 0 PID: 5772 Comm: syz.1.292 Not tainted 5.15.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:151 [inline] __ubsan_handle_out_of_bounds+0x118/0x140 lib/ubsan.c:282 dtInsertEntry+0x1746/0x1770 fs/jfs/jfs_dtree.c:3944 dtSplitPage+0x2e09/0x3f40 fs/jfs/jfs_dtree.c:1594 dtSplitUp fs/jfs/jfs_dtree.c:1090 [inline] dtInsert+0x14f9/0x6b80 fs/jfs/jfs_dtree.c:869 jfs_create+0x7b2/0xbb0 fs/jfs/namei.c:137 lookup_open fs/namei.c:3462 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x130a/0x2f20 fs/namei.c:3739 do_filp_open+0x21c/0x460 fs/namei.c:3769 do_sys_openat2+0x13b/0x4f0 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_creat fs/open.c:1345 [inline] __se_sys_creat fs/open.c:1339 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1339 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f4077518969 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:00007f4075380038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f407773ffa0 RCX: 00007f4077518969 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00002000000006c0 RBP: 00007f407759aab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f407773ffa0 R15: 00007ffd2e66a7c8 ================================================================================