[Bug 290399] [NEW] After ran the command fence_tool dump, the fenced process will take 100% CPU usage

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Daniel Holbach (dholbach):

Binary package hint: cman

I have setup with redhat-cluster-suite on two of the hardy 8.04.1 server
kernel. After the setup complete, run the command: sudo fence_tool dump.
The fenced process start taking 100% CPU usage.

SRU justification:
In certain conditions groupd, fenced, and dlm_controld all have the potential to enter infinite/tight loops surrounding poll(2) due to a file descriptor being closed and not correctly handled. The poll loop for these daemons checks for POLLHUP, but not POLLERR or POLLNVAL. As such, file descriptors in these states are unhandled.

Versions affected: Hardy
Fix in development branch: Was fixed in >= Intrepid by integration of a later, fixed, upstream release.

Minimal patch: see comment 2 just above.

TEST CASE:
This is difficult to reproduce as it supposes a full RHCS setup and hitting the situation where those daemons enter the loop.

Regression potential:
Looking at the patch, regression potential is very low. It was taken from the RedHat bug and was later successfully integrated in the following RHCS releases. Users running the version from my PPA all reported success without any nasty side-effect.

** Affects: redhatcluster
     Importance: Unknown
         Status: Fix Released

** Affects: redhat-cluster (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: redhat-cluster (Ubuntu Hardy)
     Importance: High
         Status: Fix Released


** Tags: verification-needed
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After ran the command fence_tool dump, the fenced process will take 100% CPU usage
https://bugs.launchpad.net/bugs/290399
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