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List:       apache-httpd-bugs
Subject:    [Bug 64449] New: semaphore leak on restart
From:       bugzilla () apache ! org
Date:       2020-05-18 11:32:47
Message-ID: bug-64449-7868 () https ! bz ! apache ! org/bugzilla/
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https://bz.apache.org/bugzilla/show_bug.cgi?id=64449

            Bug ID: 64449
           Summary: semaphore leak on restart
           Product: Apache httpd-2
           Version: 2.4.43
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core
          Assignee: bugs@httpd.apache.org
          Reporter: ikonta@yandex.ru
  Target Milestone: ---

I've historically used restart action to refresh CRL's, used by Apache web
server on configuration with mod_php and connection to external database.

In such case apache normally reserves 6 semaphores:
# ipcs -s | grep -c apache
6

After migration our main production server to Apache 2.4 I've found semaphore
leaks on it's restart.
It looks very like https://bugzilla.redhat.com/show_bug.cgi?id=1410883 for
reload action.
Hoping the issue is fixed in the latest release I've built apache 2.4.43.
But in this version my issue still presents.
Probably httpd fails to free semaphores when restart request interrupts some
operations.

Switching CRL update script to reload action is the sufficient workaround.

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