rsyslog use 99% CPU on RHEL 5.4 KVM virtual machine

Solution Verified - Updated -

Issue

We have realized an issue on our RHEL 5.4 KVM based virtual machine while doing an upgrade to RHEL 5.6
RHEL 5.4 system works, but there is a strange issue with rsyslog using 99% of the CPU, while on real HW/VMware rsyslog is at 0%.

Also while performing the upgrade to RHEL 5.6 yum update hangs forever at the first package:

...
Transaction Summary
================================================================================
Install     10 Package(s)
Update     286 Package(s)
Remove       0 Package(s)

Total download size: 325 M
Downloading Packages:
--------------------------------------------------------------------------------
Total                                           3.2 GB/s | 325 MB     00:00
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Updating       : libgcc                                                 1/582

Environment

  • Red Hat Enterprise Linux 5.4
  • rsyslog-2.0.6-1.el5

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