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No request delivery notification has been received from LSAPI application, possible dead lock.

Hi,

I found many erroe messages "No request delivery notification has been received from LSAPI application, possible dead lock." on the cyberpanel error log page.

Long story short, i realised if i disabled sleep(5), or reduced it in one of my php script, it went away.

So i tested it with a single php script with just 1 commend in a while loop:
sleep(10);

And I confirmed that the sleep command produced "No request delivery notification has been received from LSAPI application, possible dead lock." message.

What could be the settings paramters that cause this, is there any way to tune the settings to prevent this error message?

Thanks
ACP

Comments

  • Forgot to mentioned, i am using:
    1. Ubuntu 18.04.2 LTS
    2. Cyberpanel 1.8 Build 4
    3. Openlite LITESPEED/1.4.47 OPEN
  • test.php for duplicating the deadlock error:

    <?php
    // clear buffer, just trying if it will fixed the deadlock warning => it does not.
    /*
    set_time_limit(180);
    ini_set('output_buffering', 0);
    ini_set('implicit_flush', 1);
    ob_end_flush();
    ob_start();
    */
    $max = 20 ; $i = 0 ;
    while ($i < $max)
    {
    // usleep(900000);
    sleep(3);
    // echo "test";
    header("Status: 200");
    ob_flush();
    flush();
    $i++ ;
    }
  • The error went away after I upgraded to latest release of cyberpanel a while ago:

    Cyberpanel: 1.8 Latest Build 5
    OpenLitespeed: LITESPEED/1.4.47 OPEN

    Note: OpenLiteSpeed still using the same version, what fixed the problem?
    Also, anything guide on settings we can tune whenever we encounter this deadlock problem?

    Thanks.
    ACP


  • Same Notice here: 2019-07-22 14:04:59.454004 [NOTICE] [XXX.XXX.XX.XXX:21706] No request delivery notification has been received from LSAPI application, possible dead lock.

    Cyberpanel: 1.8 Latest Build 7
    OpenLitespeed: LITESPEED/1.4.49 OPEN
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