error: "Warning: preg_replace() [function.preg-replace]: Allocation of JIT memory failed, PCRE JIT will be disabled. This is likely caused by security restrictions. Either grant PHP permission to allocate executable memory, or set pcre.jit=0"

[torbengb]

No description provided.

[torbengb]

This error is known to occur on DreamHost shared hosting servers. Solution is to add a line to the hosting's php.ini (source).

Add this line to /home/username/.php/7.4/phprc:

; added following 1 line to adress the error, based on solution here: https://stackoverflow.com/a/59299425/20571:
; Warning: preg_replace() [function.preg-replace]: Allocation of JIT memory failed, PCRE JIT will be disabled. This is 
; likely caused by security restrictions. Either grant PHP permission to allocate executable memory, or set pcre.jit=0
ini_set('pcre.jit', '0')

After this change, need to kill off any running PHP processes: https://help.dreamhost.com/hc/en-us/articles/214200748-My-phprc-file-isn-t-updating :

• For PHP 7.4: [server]$ killall -9 php74.cgi -u shelluser
• or via the DH panel, go to Manage Domains, click on 'edit' for that domain, then click 'Change settings' and wait 10 minutes.

[torbengb]

Testing confirms the above was successful.

[AlbertHart]

Is there a tic mark missing in: ini_set('pcre.jit, '0')

[torbengb]

You are correct, it should read:

ini_set('pcre.jit', '0')

and I corrected it in the post above.

[torbengb]

Reopen:This problem persists. It can be temporarily solved with the fix mentioned above, but within (30?) minutes the issue reappears.
Need to find permanent solution.

[AlbertHart]

I agree. I worked with Dreamhost to get my php.ini file correct, but the issue keeps reoccuring.

I have filtered for it and removed it's display with code like this. It suppresses the JIT error but report other errors to me.

PHP's log_error() lets me override the error message process.
rp_error() is my own error display routine.

function log_error($no,$msg,$file,$line)
        {
            $error_message = "Error no $no: $msg in $file at line number $line";
            //rp_report("log_error STRPOS: %s", strpos($msg, "Allocation of JIT memory failed"));
            // Allocation of JIT memory failed,
            if (strpos($msg, "Allocation of JIT memory failed") !== false)
            {
                return;
            }
            else
            {
                rp_error("log_error PHP ERROR: %s", $error_message);
            }
        }

[AlbertHart]

I discovered today, after chatting with Dreamhost, that setting

ini_set('pcre.jit', '0')

(or any phprc settings)

does not work in PHP 7.4 in Dreamhost.

So I reverted back to 7.3 and was able to get pcre.jit set to 0.

From phpinfo();