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The initial issue is a possible race condition due to the use of grep parsing results from AWS CLI. A fix has been proposed and included upstream (https://github.com/ClusterLabs/resource-agents/pull/1269)


From the upstream git request:

"This is a proposed fix to avoid a race condition with "grep" while parsing the results from AWS CLI.

Currently, "grep" will match for IPs that don't belong tho the cluster resource. For example, if your cluster resource IP address is "192.168.1.1", "grep" will match "192.168.1.1*" (192.168.1.1,10,11,...,111).

This could have been fixed by a simple "grep -w" but we (AWS) thought it is more elegant to directly use the API to query for the IP.

I also included a debug log line."

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:2012