FreeBSD 5.1-p10 reproducible crash with Apache2

From: QBranko_F=2E_Gra=E8nar=22?= (bfg_at_noviforum.si)
Date: 10/29/03

  • Next message: Karl M. Joch: "Re: 5.1 - stl Kernel compile fails" 
    Date: Wed, 29 Oct 2003 11:37:56 +0100
To: freebsd-current@freebsd.org

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    Hi.

    FreeBSD 5.1-p10 (and also possible other 5.1-pX version) can be remotely
    locked up if the following criteria is met:

    + apache2 has mod_ssl loaded and enabled
    + apache2 has the following configuration directives set to the
    following values:

            SSLMutex sem
            SSLSessionCache shm:/some/file(1048576)

    + client connects via SSL/TLS to apache fast enough.

    If all conditions above are satisfied except the last one, then lockup
    doesn't happen.

    I tested on three 5.1-p10 machines (SMP, uniprocessor, uniprocessor with
    hypterthreading) with JMeter 1.9.1.

    It is possible lockup machine with 100 requests (1 concurrent request)
    in 1-3 seconds.

    If SSLMutex is set to file:/path/somewhere and SSLSessionCache is set to
    dbm:/some/dbm lockup does not accour.

    Linux 2.4.22 is not affected by this issue.

    Details:

    apache: 2.0.47
    php: 4.3.3 + turck mmcache 2.4.2
    web application: horde imp webmail

    Best regards, Brane
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  • Next message: Karl M. Joch: "Re: 5.1 - stl Kernel compile fails"