[Bug 1169740] [NEW] rsyslog hangs loading modules

[Jon Tai]

Public bug reported:

We have rsyslog configured to listen for forwarded logs on TCP and UDP,
and to forward logs on to a central log host. On a number of occasions
we have observed rsyslog in a hung state on our production machines --
not fowarding logs and not writing them to disk locally. It doesn't
happen all the time, so I believe there's some sort of race condition
involved.

I've attached a stack trace taken when the process was hung. I believe
the issue is the same as the one discussed here: http://www.gossamer-
threads.com/lists/rsyslog/users/5873 There is a patch attached to that
thread.

Ubuntu 12.04.1 LTS x86_64
rsyslog 5.8.6-1ubuntu8

** Affects: rsyslog (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Attachment added: "Stack trace when rsyslog is hung"
   https://bugs.launchpad.net/bugs/1169740/+attachment/3645960/+files/stack-trace.txt

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https://bugs.launchpad.net/bugs/1169740

Title:
  rsyslog hangs loading modules

Status in “rsyslog” package in Ubuntu:
  Confirmed

Bug description:
  We have rsyslog configured to listen for forwarded logs on TCP and
  UDP, and to forward logs on to a central log host. On a number of
  occasions we have observed rsyslog in a hung state on our production
  machines -- not fowarding logs and not writing them to disk locally.
  It doesn't happen all the time, so I believe there's some sort of race
  condition involved.

  I've attached a stack trace taken when the process was hung. I believe
  the issue is the same as the one discussed here: http://www.gossamer-
  threads.com/lists/rsyslog/users/5873 There is a patch attached to that
  thread.

  Ubuntu 12.04.1 LTS x86_64
  rsyslog 5.8.6-1ubuntu8

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