RHEL 5 Cluster node was evicted by qdiskd but did not log any messages before eviction indicating that its I/O was hung or failing

Solution In Progress - Updated 2014-07-26T15:17:51+00:00 -

Issue

My node was evicted by qdiskd on another node, however the evicted node gave no indication its I/O was failing or hanging before the eviction. We know the node was still responsive (ie had not panicked or completely hung) because cman/openais reported being killed by the eviction:

Jul 30 02:24:54 node2 openais[22959]: [CMAN ] cman killed by node 1 because we were killed by cman_tool or other application

But qdiskd is supposed to warn us when it detects hung I/O or failed I/O, but neither shows up in the logs here.

Red Hat Enterprise Linux (RHEL) 5 Update 4 through RHEL 5 Update 8 with the High Availability Add Ons
- cman releases starting with 2.0.115-1.el5 up to (but not including) 2.0.115-109.el5
  - Earlier releases than cman-2.0.115-1.el5 did not report any sort of warning for hung I/O in qdiskd, so it is expected prior to an eviction from stalled I/O to not see any indications of why
  - Later releases than cman-2.0.115-109.el5 have a feature to avoid evictions when I/O is hanging (https://access.redhat.com/knowledge/solutions/153223)
Cluster configured to use a quorum device (<quorumd> in /etc/cluster/cluster.conf)

Node evicted but qdiskd on the evicted node does not report any of:

qdiskd[XXX]: <warning> qdiskd: read (system call) has hung for YY seconds

qdiskd[XXX]: <warning> qdiskd: write (system call) has hung for YY seconds

qdiskd[XXX]: <error> Error writing to quorum disk

Evidence suggesting that the node was still alive and responsive up until the point it was evicted. For example, if it logs messages indicating it recognized it was evicted:

openais[22959]: [CMAN ] cman killed by node 1 because we were killed by cman_tool or other application

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