PHP 5.6 Segmentation fault: 11 (anonnymous function, recursion)

Question

What is wrong with this code? It works when $it = 1000 but fails with Segmentation fault: 11 when $it > 8000. There is neither a script timeout nor memory exhausted. Setting high memory_limit makes no difference.

$it = 10000;
$middleware = function($chain) {
    $chain();
};

$chain = function() use (&$chain, $it, $middleware) {
    static $index = 0;
    if ($index++ < $it) {
        $middleware($chain);
    }
};

$chain();

My system is PHP 5.6.16 with the following extensions:

Core, date, ereg, libxml, openssl, pcre, sqlite3, zlib, bcmath, bz2,
calendar, ctype, dom, hash, fileinfo, filter, ftp, gd, gettext, SPL,
iconv, json, ldap, mbstring, session, standard, mysqlnd, pcntl,
mysqli, PDO, pdo_mysql, pdo_sqlite, Phar, posix, Reflection, mysql,
shmop, SimpleXML, soap, sockets, exif, sysvmsg, sysvsem, sysvshm,
tidy, tokenizer, wddx, xml, xmlreader, xmlrpc, xmlwriter, zip, curl,
gmp, igbinary, imap, intl, mcrypt, memcache, memcached, mongo, 
mssql, OAuth, pdo_dblib, pdo_pgsql, pgsql, propro, raphf, readline,  
redis, solr, ssh2, xsl, http, mhash, xdebug

Argh, please start using varying variable names instead of just $chain everywhere, it makes it rather painful to parse. — Jonnix
– Jonnix, Commented Dec 7, 2015 at 13:13
The Segmentation fault indicates the server has run out of memory. That's why it works until '$it > 8000'. Literally a stack overflow condition. — DFriend
– DFriend, Commented Dec 7, 2015 at 13:25
It does not run out of memory. The memory level it takes is much lower than maximum allowed by php — spajak
– spajak, Commented Dec 7, 2015 at 13:38
Yes I can enable xdebug, no difference. xdebug only fires when xdebug.max_nesting_level i lower than $it — spajak
– spajak, Commented Dec 7, 2015 at 14:12

VerteXVaaR · Accepted Answer · 2017-01-24 10:18:49Z

1

Have you tried changing the PHP version? Anytime i get segmentation faults i switch to PHP 7.0 and suddenly there's an accurate error message. I fix the error and switch back to PHP 5.6 and it works again. Maybe your callback throws an exception and the error handler crashes.

answered Jan 24, 2017 at 10:18

VerteXVaaR

8237 silver badges18 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

PHP 5.6 Segmentation fault: 11 (anonnymous function, recursion)

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related