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[Andreas Thielen <thielen@xxxxxxxxxxxxxxxx>]

Public bug reported:

Hallo,

wir betreiben den apache mit mod_proxy_balancer und leiten unsere Http-
Requests an Tomcat Applicationserver weiter. Seit dem Security-Update
vom 10.03. (Ubuntu Security Notice USN-2523-1) haben wir das Problem,
dass unser Apache nach einer Weile stoppt. Das Error-Log zeigt folgende
Meldung:

[Sun Mar 15 10:22:18.483077 2015] [:emerg] [pid 24451:tid
140709170571136] AH00020: Configuration Failed, exiting


Wir beobachten seither auch, dass vor einem Crash folgende Meldungen im Error-Log stehen und das mehrmals pro Minute, wie man am Zeitstempel erkennen kann:

[Sun Mar 15 10:22:16.718748 2015] [core:notice] [pid 24451:tid 140709170571136] AH00094: Command line: '/usr/sbin/apache2'
[Sun Mar 15 10:22:16.777279 2015] [mpm_worker:notice] [pid 24451:tid 140709170571136] AH00297: SIGUSR1 received.  Doing graceful restart
[Sun Mar 15 10:22:16.956168 2015] [ssl:warn] [pid 24451:tid 140709170571136] AH02292: Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366)
[Sun Mar 15 10:22:16.956228 2015] [mpm_worker:notice] [pid 24451:tid 140709170571136] AH00292: Apache/2.4.7 (Ubuntu) OpenSSL/1.0.1f configured -- resuming normal operations
[Sun Mar 15 10:22:16.956232 2015] [core:notice] [pid 24451:tid 140709170571136] AH00094: Command line: '/usr/sbin/apache2'
[Sun Mar 15 10:22:17.023168 2015] [mpm_worker:notice] [pid 24451:tid 140709170571136] AH00297: SIGUSR1 received.  Doing graceful restart
[Sun Mar 15 10:22:17.209792 2015] [ssl:warn] [pid 24451:tid 140709170571136] AH02292: Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366)
[Sun Mar 15 10:22:17.209846 2015] [mpm_worker:notice] [pid 24451:tid 140709170571136] AH00292: Apache/2.4.7 (Ubuntu) OpenSSL/1.0.1f configured -- resuming normal operations
[Sun Mar 15 10:22:17.209849 2015] [core:notice] [pid 24451:tid 140709170571136] AH00094: Command line: '/usr/sbin/apache2'
[Sun Mar 15 10:22:17.840076 2015] [mpm_worker:notice] [pid 24451:tid 140709170571136] AH00297: SIGUSR1 received.  Doing graceful restart
[Sun Mar 15 10:22:18.039028 2015] [ssl:warn] [pid 24451:tid 140709170571136] AH02292: Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366)
[Sun Mar 15 10:22:18.039083 2015] [mpm_worker:notice] [pid 24451:tid 140709170571136] AH00292: Apache/2.4.7 (Ubuntu) OpenSSL/1.0.1f configured -- resuming normal operations
[Sun Mar 15 10:22:18.039088 2015] [core:notice] [pid 24451:tid 140709170571136] AH00094: Command line: '/usr/sbin/apache2'
[Sun Mar 15 10:22:18.075983 2015] [mpm_worker:notice] [pid 24451:tid 140709170571136] AH00297: SIGUSR1 received.  Doing graceful restart
[Sun Mar 15 10:22:18.261200 2015] [ssl:warn] [pid 24451:tid 140709170571136] AH02292: Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366)
[Sun Mar 15 10:22:18.261255 2015] [mpm_worker:notice] [pid 24451:tid 140709170571136] AH00292: Apache/2.4.7 (Ubuntu) OpenSSL/1.0.1f configured -- resuming normal operations
[Sun Mar 15 10:22:18.261263 2015] [core:notice] [pid 24451:tid 140709170571136] AH00094: Command line: '/usr/sbin/apache2'
[Sun Mar 15 10:22:18.310111 2015] [mpm_worker:notice] [pid 24451:tid 140709170571136] AH00297: SIGUSR1 received.  Doing graceful restart


Unser Setup:  Ubuntu 14.04 LTS mit apache 2.4.7-1ubuntu4.4 auf Hardware Maschinen mit Intel® Xeon® E3-1270 v3 
Quad-Core Haswell inkl. Hyper-Threading-Technologie, Arbeitsspeicher32 GB ECC RAM, Festplatten2 x 240 GB SATA 6 Gb/s Data Center Series SSD

Konfiguration:
Anzal VHosts: ca.600
<IfModule mpm_worker_module>
  StartServers           5
  MinSpareThreads        320
  MaxSpareThreads        640
  ThreadsPerChild        128
  MaxRequestWorkers      8192
  MaxConnectionsPerChild 0
  ThreadLimit            128
  ServerLimit            64
</IfModule>


Leider können wir uns das nicht erklären. Was könnte hierfür die Ursache sein?

Viele Grüße
Andreas

** Affects: apache2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1432571

Title:
  random apache crash - configuration failed exiting

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