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');
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
I was able to resolve with opcache.enable_cli=1, but for me the underlying problem was wrong permissions on the /tmp directory in MacOS.
This is what I did to fix this: sudo rm -Rf /tmp sudo rm -Rf /private/tmp sudo mkdir private/tmp sudo chown root:wheel /private/tmp sudo chmod 1777 /private/tmp sudo ln -s /private/tmp /tmp