Description:
------------
Sorry I can't provide full test application cause it based on Yii 1.17/sqlite
But the php-cli error arises in next situation:

I have a simple yii1 migration script, that takes CSV-file and insert it in sqlite database via simpe model many times like this.

On the random loop with PHP 7.1.3 I always have SEGFAULT.

php.ini has no special limits and almost default. (memory_limit=-1)

With php 7.0 and php 5.6 everything is OK.

coredumpctl info
----------------

           PID: 3928 (php)
           UID: 1000 (igor)
           GID: 1000 (igor)
        Signal: 11 (SEGV)
     Timestamp: Wed 2017-03-29 11:38:14 MSK (2min 15s ago)
  Command Line: php ./yiic migrate up 1
    Executable: /usr/bin/php
 Control Group: /user.slice/user-1000.slice/session-c1.scope
          Unit: session-c1.scope
         Slice: user-1000.slice
       Session: c1
     Owner UID: 1000 (igor)
       Boot ID: 13db0eaa0e644683ad29c7dab2f3c373
    Machine ID: e7a1cd2067794157a662f3ce1b10109c
      Hostname: machine
       Storage: /var/lib/systemd/coredump/core.php.1000.13db0eaa0e644683ad29c7dab2f3c373.3928.1490776694000000000000.lz4
       Message: Process 3928 (php) of user 1000 dumped core.
                
                Stack trace of thread 3928:
                #0  0x0000000000669962 _emalloc_56 (php)
                #1  0x0000000000719259 n/a (php)
                #2  0x00000000006db1ab execute_ex (php)
                #3  0x0000000000681771 zend_call_function (php)
                #4  0x00000000005498b9 n/a (php)
                #5  0x00000000007331b4 n/a (php)
                #6  0x00000000006db1ab execute_ex (php)
                #7  0x0000000000735658 zend_execute (php)
                #8  0x00000000006916b3 zend_execute_scripts (php)
                #9  0x000000000062e500 php_execute_script (php)
                #10 0x00000000007378cc n/a (php)
                #11 0x0000000000433f82 n/a (php)
                #12 0x00007f719d9da511 __libc_start_main (libc.so.6)
                #13 0x00000000004340ba _start (php)

Test script:
---------------
for($i=1;$i<5000000;$i++) {
   $m = SomeModel::model()->findByAttributes(array('attr'=>'value'));
   if (!$m) {
     $model = new SomeModel;
     $model->attr1 = '...';
     $model->attr2 = '...';
     $model->attr3 = '...';
     $model->save();
   }
}