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[Linux-cluster] RHEL 5.7: cpg_leave error retrying



Has anyone experienced the following error/hang/loop when attempting
to stop rgmanager or cman on the last node of a two node cluster?

groupd[4909]: cpg_leave error retrying

Basic scenario:
RHEL 5.7 with the latest errata for cman.
Create a two node cluster with qdisk and higher totem token=70000
start cman on both nodes, wait for qdisk to become online with master determined
stop cman on node1, wait for it to complete
stop cman on node2
error "cpg_leave" seen in logging output

Observations:
The "service cman stop" command hangs at "Stopping fencing" output
If I cycle openais service with "service openais restart", then the
"service cman stop" will complete (need to manually stop the openais
service afterwards).
When hung, the command "group_tool dump" hangs (any group_tool command hangs).
The hang is inconsistent which, in my mind, implies a timing issue.
Inconsistent meaning that every once in a while, then shutdown will
complete (maybe 20% of the time).
I have seen the issue with the stopping of rgmanager and cman.  The
below example has been stripped down to show the hang with cman.
I have tested with varying the length of time to wait before stopping
the second node with no difference (hang still occurs periodically).
I have tested with commenting out the totem token and the
quorum_dev_poll and still experienced the hang. (we use the longer
timeouts to help survive network and san blips)/


I have dug through some of the source code.  The message appears in
group's cpg.c as function do_cpg_leave( ).  This calls the cpg_leave
function located in the openais package.

If I attach to the groupd process with gdb, I get the following stack.
 Watching with strace, groupd is just in a looping state.
(gdb) where
#0  0x000000341409a510 in __nanosleep_nocancel () from /lib64/libc.so.6
#1  0x000000341409a364 in sleep () from /lib64/libc.so.6
#2  0x000000000040a410 in time ()
#3  0x000000000040bd09 in time ()
#4  0x000000000040e2cb in time ()
#5  0x000000000040ebe0 in time ()
#6  0x000000000040f394 in time ()
#7  0x000000341401d994 in __libc_start_main () from /lib64/libc.so.6
#8  0x00000000004018f9 in time ()
#9  0x00007fff04a671c8 in ?? ()
#10 0x0000000000000000 in ?? ()

If I attach to the aisexec process with gdb, I see the following:
(gdb) where
#0  0x00000034140cb696 in poll () from /lib64/libc.so.6
#1  0x0000000000405c50 in poll_run ()
#2  0x0000000000418aae in main ()


As you can see in the cluster.conf example below, I have attempted
many different ways to create more debug logging.  I do see debug
messages from openais in the cpg.c component during startup, but
nothing is logged on the shutdown hang scenario.

I would appreciate any guidance on how to troubleshoot further,
especially with increasing the tracing of the openais calls in cpg.c.

Thanks
Robert


Example cluster.conf:
<?xml version="1.0"?>
<cluster config_version="33" name="cluster_app_1">
        <logging to_syslog="yes" syslog_facility="local4"
timestamp="on" debug="on">
                <logger ident="CPG" debug="on"/>
                <logger ident="CMAN" debug="on"/>
        </logging>
        <cman expected_nodes="2" expected_votes="3" quorum_dev_poll="70000">
                <multicast addr="239.192.1.192"/>
        </cman>
        <totem token="70000"/>
        <fence_daemon clean_start="0" log_facility="local4"
post_fail_delay="10" post_join_delay="60"/>
        <quorumd interval="1" label="rhcs_qdisk" log_facility="local4"
log_level="7" min_score="1" tko="60" votes="1">
                <heuristic interval="2" program="/bin/ping -c1 -t2
-Ibond0 10.162.106.1" score="1" tko="3"/>
        </quorumd>
        <clusternodes>
                <clusternode name="node1-priv" nodeid="1" votes="1">
                        <fence>
                                <method name="1">
                                        <device name="iLO_node1"/>
                                </method>
                        </fence>
                        <multicast addr="239.192.1.192" interface="bond1"/>
                </clusternode>
                <clusternode name="node2-priv" nodeid="2" votes="1">
                        <fence>
                                <method name="1">
                                        <device name="iLO_node2"/>
                                </method>
                        </fence>
                        <multicast addr="239.192.1.192" interface="bond1"/>
                </clusternode>
        </clusternodes>
        <fencedevices>
                <fencedevice action="off" agent="fence_ipmilan"
ipaddr="X.X.X.X" login="node1_fence" name="iLO_node1"
passwd="password" power_wait="10" lanplus="1"/>
                <fencedevice action="off" agent="fence_ipmilan"
ipaddr="X.X.X.X" login="node2_fence" name="iLO_node2"
passwd="password" power_wait="10" lanplus="1"/>
        </fencedevices>
        <rm log_level="7"/>
</cluster>


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