Description:
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running php 7 using php-fpm on lighttpd with mysqli on mariadb causes segmentation fault at mysqli_stmt_bind_result as reported in php-fpm.log:
[pool www] child 24047 exited on signal 11 (SIGSEGV) after 6.518082 seconds from start
lighttpd logs report the following error:
mod_fastcgi.c.2424 unexpected end-of-file (perhaps the fastcgi process died)

2 key observations:

1. commenting out the bind_result line eliminates the error - so something triggers the segmentation fault when bind_result is called under php 7 (7.1.2)

2. running php 5 (5.5.9) instead of php 7 (7.1.2) does not have the same issue - so it seems there is something in php version 7.1.2 that is triggering the sigsegv

Test script:
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$stmt = $db->prepare($sql);
$stmt->execute();
$stmt->bind_result($id, $name); //This is where segmentation fault occurs - if this line is commented out then the error goes away but so does the logic! Same line does not cause any issue with php 5 and works as desired returning the result set successfully.