Note: This bug is displayed in read-only format because
the product is no longer active in Red Hat Bugzilla.
RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
+++ This bug was initially created as a clone of Bug #1360234 +++
Description of problem:
After putting the cluster in maintanance mode, then reboot the nodes and resetting the maintenance status sometimes the ClusterMon resource keeps running even if "crm_mon" is NOT running. Normally ClusterMon should detect the missing "crm_mon" in reliable way to report the node as "bad"
The mechanism used by "ClusterMon" script delivered in "/usr/lib/ocf/resource.d/pacemaker/ClusterMon":
The script checks the content of the PID file created by "crm_mon" and tries to send a signal ("kill -s 0 <PID>" ) to this PID.
If any process is running with this PID the resource agent script reports that "crm_mon" is running. But this can be any process running with this PID (e.g. after the reboot of the machine this could be another daemon process)
In this case the reported value of the agent is wrong.
Steps to Reproduce:
1. Set ClusterMon resource
2. Put node into maintenance mode
3. Reboot node
4. Either find way to force PID, originally assigned to original crm_mon PID, to other process (or try couple times so it happens randomly)
5. Disable maintenance mode
Actual results:
If PID of crm_mon changes after reboot the ClusterMon_monitor still checks the old PID and can kill other process instead
Expected results:
ClusterMon_monitor checks PID of actual crm_mon (not the old one)