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[2016-06-20 00:37 UTC] oldbucsfan at hotmail dot com
Description:
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Running on wordpress and installing php_ssh2.dll leads to a problem when calling and returning stream_get_wrappers(). It seems to stall and gives a white screen for Wordpress. I tested it out with a simple php script unassociated with Wordpress and I have seen it stall out in the middle of the script. This error does not occure when php_ss2.dll is not installed. Used the 1.0 version of php_ssh2.dll x64 thread safe.
Test script:
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$wrappers = stream_get_wrappers();
print_r($wrappers);
$wrappers_re = '(' . join('|', $wrappers) . ')';
print($wrappers_re);
Expected result:
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Array ( [0] => php [1] => file [2] => glob [3] => data [4] => http [5] => ftp [6] => zip [7] => compress.zlib [8] => https [9] => ftps [10] => phar [11] => ssh2.shell [12] => ssh2.exec [13] => ssh2.tunnel [14] => ssh2.scp [15] => ssh2.sftp ) (php|file|glob|data|http|ftp|zip|compress.zlib|https|ftps|phar|ssh2.shell|ssh2.exec|ssh2.tunnel|ssh2.scp|ssh2.sftp)
Actual result:
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Array (
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The code here is where it occurs: //Start if ((url_stream_wrappers_hash = php_stream_get_url_stream_wrappers_hash())) { array_init(return_value); ZEND_HASH_FOREACH_STR_KEY(url_stream_wrappers_hash, stream_protocol) { if (stream_protocol) { add_next_index_str(return_value, zend_string_copy(stream_protocol)); } } ZEND_HASH_FOREACH_END(); //End I wonder if what is happening is that php_stream_get_url_stream_wrappers_hash is returning a bad hash (perhaps corrupted or something?). This then goes through a few different stream_protocol iterations. When it hits the bad stream protocol, ZEND_HASH_FOREACH_STR_KEY still thinks it is a string, making the if evaluate as true. Then when zend_string_copy tries to copy the string through the pointer, it accesses a bad memory location and causes the crash. I don't claim to have any expertise in this, but it was just my thoughts based on a novice look at the code.Hi, I'm having the same exact problem. Every 1 to 30 days (randomly) apache return a 500 error, only of wordpress site that use this portion of code $wrappers = stream_get_wrappers(); $wrappers_re = '(' . join('|', $wrappers) . ')'; contained in wp-includes/functions.php wp_is_stream() function line 4944 Other php site (not wp) run normally fine. When restarting apache wp sites return working ok. I tried to debug before restarting apache in index.php of wp, and putting this code before wp calls and exit (so no wp code are executing). $wrappers = stream_get_wrappers(); $wrappers_re = '(' . join('|', $wrappers) . ')'; 1. print_r($wrappers); 2. print_r(count($wrappers)); 3. print_r(strlen($wrappers[10])); exit(); Output was (point 1 is truncated): 1. Array ( [0] => php [1] => file [2] => glob [3] => data [4] => http [5] => ftp [6] => zip [7] => compress.zlib [8] => compress.bzip2 [9] => https [10] => 2. 12 3. sorry no exact output, but was someting like 12TB -> 12123123123123 the right output after apache restart is: 1. Array ( [0] => php [1] => file [2] => glob [3] => data [4] => http [5] => ftp [6] => zip [7] => compress.zlib [8] => compress.bzip2 [9] => https [10] => ftps [11] => phar ) 2. 12 3. 4 I'm running Windows 2012 R2, apache VC14 2.4.20 win64 and php 7.0.12 ts x64 with opcache enabled for all sites no php_ssh2 loaded. I'm not 100% sure but as I remember the problem begin to occur after enabling opcache, I hope this help.Okay, so using abs.exe 1000s of times with the following code will cause the crash: ------------------------------- Test script: $wrappers = stream_get_wrappers(); print_r($wrappers); $wrappers_re = '(' . join('|', $wrappers) . ')'; print($wrappers_re); This seems to temporarily relieve the issue. ---------------------------- Fix: $wrappers = stream_get_wrappers(); print_r($wrappers); $wrappers_re = "(php|file|glob|data|http|ftp|zip|compress.zlib|https|ftps|phar|ssh2.shell|ssh2.exec|ssh2.tunnel|ssh2.scp|ssh2.sftp)"; print($wrappers_re);hi, I tried to run also ab and abs with -n 1000 -c 10 with the code $wrappers = stream_get_wrappers(); print_r($wrappers); $wrappers_re = '(' . join('|', $wrappers) . ')'; print($wrappers_re); but no crash happens! I can say my cash happen every 2/3 weeks Only have 1 site with phpmyadmin that use https, so few connections per day.. All other are normal httpHello, i came across this error and can reproduce it. i compiled apache and php myself (on Linux hostname 3.12.62-60.64.8-default #1 SMP Tue Oct 18 12:21:38 UTC 2016 (42e0a66) x86_64 x86_64 x86_64 GNU/Linux) and saw this error pop up in the wordpress-instance PHP Fatal error: Allowed memory size of 6442450944 bytes exhausted (tried to allocate 15126708878888855354 bytes) in wp-includes/functions.php on line 5161 which is this function: function wp_is_stream( $path ) { $wrappers = stream_get_wrappers(); $wrappers_re = '(' . join('|', $wrappers) . ')'; return preg_match( "!^$wrappers_re://!", $path ) === 1; } so i tried this code - to take a look if this is a wordpress-problem <?php print_r(stream_get_wrappers()); ?> first time i called the URL for this code i got error 500 and another PHP Fatal Error in the log apache let the corrupted child die [Mon Feb 27 15:50:34.341436 2017] [core:notice] [pid 10599:tid 139796708411136] AH00052: child pid 5329 exit signal Segmentation fault (11) second time calling the script i got the output: Array ( [0] => https [1] => ftps [2] => compress.zlib [3] => php [4] => file [5] => glob [6] => data [7] => http [8] => ftp [9] => phar [10] => zip ) something is still weird apache 2.4.25 php 7.1.2 openssl 1.0.2kI've had this problem recently with PHP 7.2.0. When the problem occurred the message was like this Fatal error: Allowed memory size of 201326592 bytes exhausted (tried to allocate 2178642796290 bytes) in wp-includes\functions.php on line 5216 I added some debug information into the WordPress function wp_is_stream to discover that $wrappers[5] was corrupted. function wp_is_stream( $path ) { $wrappers = stream_get_wrappers(); echo count( $wrappers ) . PHP_EOL; echo strlen( $wrappers[5] ). PHP_EOL; print_r( $wrappers ); The print_r()failed due to out of memory since $wrappers[5] was a very long string. I experienced the problem more than once, over a couple of days, but cannot reproduce it at will. I had to stop and restart Apache to recover from the error. When it's working the debug output is: 11 3 Array ( [0] => php [1] => file [2] => glob [3] => data [4] => http [5] => ftp [6] => zip [7] => compress.zlib [8] => https [9] => ftps [10] => phar )I've had this problem recently with PHP 7.2.0. When the problem occurred the message was like this Fatal error: Allowed memory size of 201326592 bytes exhausted (tried to allocate 2178642796290 bytes) in wp-includes\functions.php on line 5216 I added some debug information into the WordPress function wp_is_stream to discover that $wrappers[5] was corrupted. function wp_is_stream( $path ) { $wrappers = stream_get_wrappers(); echo count( $wrappers ) . PHP_EOL; echo strlen( $wrappers[5] ). PHP_EOL; print_r( $wrappers ); The print_r()failed due to out of memory since $wrappers[5] was a very long string. I experienced the problem more than once, over a couple of days, but cannot reproduce it at will. I had to stop and restart Apache to recover from the error. When it's working the debug output is: 11 3 Array ( [0] => php [1] => file [2] => glob [3] => data [4] => http [5] => ftp [6] => zip [7] => compress.zlib [8] => https [9] => ftps [10] => phar )