It looks like an infinite loop
The stack:
(gdb) bt
0 0x0000000000ba46e3 in xbuf_format_converter ()
1 0x0000000000ba70bc in php_printf_to_smart_string ()
2 0x0000000000c73d9b in zend_vspprintf ()
3 0x0000000000c73ec3 in zend_spprintf ()
4 0x00007f2b8407f9b0 in hp_get_function_name (execute_data=0x7f2b83eed720) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:672
5 hp_execute_ex (execute_data=0x7f2b83eed720) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1116
6 0x0000000000e08947 in execute_ex ()
7 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eed620) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
8 0x0000000000e08947 in execute_ex ()
9 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eed420) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
10 0x0000000000e08947 in execute_ex ()
11 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eed220) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
12 0x0000000000e08947 in execute_ex ()
13 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eed020) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
14 0x0000000000e08947 in execute_ex ()
15 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eece20) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
16 0x0000000000e08947 in execute_ex ()
17 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eecc20) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
18 0x0000000000e08947 in execute_ex ()
19 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eeca20) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
20 0x0000000000e08947 in execute_ex ()
21 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eec820) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
22 0x0000000000e08947 in execute_ex ()
23 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eec620) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
24 0x0000000000e08947 in execute_ex ()
25 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eec420) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
26 0x0000000000e08947 in execute_ex ()
27 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eec220) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
It looks like an infinite loop The stack: (gdb) bt
0 0x0000000000ba46e3 in xbuf_format_converter ()
1 0x0000000000ba70bc in php_printf_to_smart_string ()
2 0x0000000000c73d9b in zend_vspprintf ()
3 0x0000000000c73ec3 in zend_spprintf ()
4 0x00007f2b8407f9b0 in hp_get_function_name (execute_data=0x7f2b83eed720) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:672
5 hp_execute_ex (execute_data=0x7f2b83eed720) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1116
6 0x0000000000e08947 in execute_ex ()
7 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eed620) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
8 0x0000000000e08947 in execute_ex ()
9 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eed420) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
10 0x0000000000e08947 in execute_ex ()
11 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eed220) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
12 0x0000000000e08947 in execute_ex ()
13 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eed020) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
14 0x0000000000e08947 in execute_ex ()
15 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eece20) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
16 0x0000000000e08947 in execute_ex ()
17 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eecc20) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
18 0x0000000000e08947 in execute_ex ()
19 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eeca20) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
20 0x0000000000e08947 in execute_ex ()
21 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eec820) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
22 0x0000000000e08947 in execute_ex ()
23 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eec620) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
24 0x0000000000e08947 in execute_ex ()
25 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eec420) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
26 0x0000000000e08947 in execute_ex ()
27 0x00007f2b8407f89d in hp_execute_ex (execute_data=0x7f2b83eec220) at /home/liushuai/git_dir/baidu/third-party/php-extensions/.tmp/php7.0/xhprof/src/xhprof.c:1127
28 0x0000000000e08947 in execute_ex ()