Daily maintenance task hangs at check-quota or dk_sign

Symptoms

Daily maintenance task hangs due to the following hung processes:

CONFIG_TEXT: root 14993 1 0 Aug24 ? 00:00:00 /usr/bin/perl /usr/sbin/sendmail -i – john.doe@example.com
root 14999 14993 0 Aug24 ? 00:00:00 _ /usr/sbin/sendmail.act -i – john.doe@example.com
popuser 15003 14999 0 Aug24 ? 00:00:00 _ /usr/sbin/sendmail.act -i – john.doe@example.com
popuser 15004 15003 0 Aug24 ? 00:00:00 _ /usr/local/psa/handlers/hooks/check-quota none root@plesk.example.com john.doe@example.com

OR

CONFIG_TEXT: root 13975 0.0 0.0 28852 3180 ? Sep10 0:00 /usr/bin/perl /usr/sbin/sendmail -i – john.doe@example.com
root 13981 0.0 0.0 23868 1508 ? Sep10 0:00 _ /usr/sbin/sendmail.act -i – john.doe@example.com
popuser 13994 0.0 0.0 23868 1476 ? Sep10 0:00 _ /usr/sbin/sendmail.act -i – john.doe@example.com
popuser 13998 0.0 0.0 45900 2228 ? Sep10 0:00 _ /usr/local/psa/handlers/hooks/dk_sign signer root@plesk.example.com john.doe@example.com

If kill all check-quota or dk_sign processes, execution of daily maintenance task continues.

Cause

This is a Plesk bug with ID PPPM-7000 , which is planned to be fixed in future Plesk updates.

Resolution

Until the bug is fixed, the following workaround is available:

1. Check the currently used mail server at Tools & Settings > Mail Server Settings > Installed mail server.

2. Connect to the server using SSH .

3. Download a patch:

   • for Postfix:

     # wget https://plesk.zendesk.com/hc/article_attachments/115002481014/postfix-sendmail-wrapper.tar.gz

   • for Qmail:

     # wget https://plesk.zendesk.com/hc/article_attachments/115002475673/qmail-sendmail-wrapper.tar.gz

4. Unpack the patched file (example for Postfix):

   # tar -xzvf postfix-sendmail-wrapper.tar.gz

5. Backup the original file (example for Postfix):

   # mv /usr/lib64/plesk-9.0/postfix-sendmail-wrapper{,.orig}

6. Apply the patch and set the correct permissions (example for Postfix):

   # cp postfix-sendmail-wrapper /usr/lib64/plesk-9.0/postfix-sendmail-wrapper
   # chmod 4555 /usr/lib64/plesk-9.0/postfix-sendmail-wrapper