PHP Bad File Descriptor Error

Question

We've recently upgraded our servers from PHP 5.4.15 to 5.5.1 and have started getting this error in the logs Fatal Error Unable to create lock file: Bad file descriptor I've tracked it down to this bit a code that opens another small PHP script which uploads a file to S3 in the background. ``` // Grab uploaded file and assign a working name $fileTemp = $_FILES['file']['tmp_name']; $pathToWorkingFile = tempnam($g_TmpDirectory, "TR-"); // Move the file to our working area if (move_uploaded_file($fileTemp, $pathToWorkingFile) === false) throw new Exception("Cannot move file to staging area.", 1011); // Where the file will end up on S3 $s3Bucket = "test.bucket.com"; $uploadDest = "/uploads/image123.jpg"; // Create process to upload file in background popen("/usr/local/bin/php /path/to/uploadScript.php $pathToWorkingFile $s3Bucket $uploadDest &", 'r'); ```

Accepted Answer

It turns out that this error was caused by our configuration of OPcache which was enabled during the PHP upgrade process. When I disable it for command line operations by removing this setting from php.ini everything works fine.

```
opcache.enable_cli=1
```

PHP Bad File Descriptor Error

Solution

Problem