(gdb) run
Starting program: /usr/local/nginx/sbin/nginx -t
[Thread debugging using libthread_db enabled]
[New Thread 182896549120 (LWP 31420)]
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 182896549120 (LWP 31420)]
ngx_vslprintf (buf=0x7fbfffec64 “”, last=0x7fbffff030 “ÕK7”,
fmt=0x46b77c “s:%ui has the different levels than”, args=0x7fbfffec10)
at src/core/ngx_string.c:256
256 *buf++ = *p++;