Mantis - Quercus
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ID: Category: Severity: Reproducibility: Date Submitted: Last Update:
6083 crash always 08-04-17 11:43 08-04-17 11:43
Reporter: michaelahlers Platform:  
Assigned To: OS:  
Priority: normal OS Version:  
Status: new Product Version:  
Product Build: Resolution: open  
Projection: none      
ETA: none Fixed in Version:  
Summary: 0006083: CurlMultiResource#execute Stuck in Infinite Loop
Description: When using curl_multi_exec, com.caucho.quercus.lib.curl.CurlMultiResource#execute is called in an infinite loop, apparently because _runningCount is never decremented as requests complete.

This is easily reproducible with the following PHP script (using Guzzle) invoked using either QuercusEngine (or any other means):

<?php
$client = new \\Guzzle\\Http\\Client('https://caucho.com'); [^]
$client->get('/')->send();
$client->get('/')->send();
?>

One request will succeed, but the script will always hang on subsequent requests.

I found that adding this statement to com.caucho.quercus.lib.curl.CurlMultiResource#removeCurl (after _curlList.remove(curl)):

if (isRemoved) {
    _runningCount--;
}

Reliably fixes the bug (however, I'm not sure what implications this might have besides).
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