Bug 1955722

Summary:	crond core dumps after updating /usr/lib64/libnss_winbind.so library
Product:	Red Hat Enterprise Linux 7	Reporter:	jas
Component:	cronie	Assignee:	Jan Staněk <jstanek>
Status:	ASSIGNED ---	QA Contact:	RHEL CS Apps Subsystem QE <rhel-cs-apps-subsystem-qe>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	7.9	CC:	opohorel
Target Milestone:	rc
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Hardware:	Unspecified
OS:	Linux
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Description jas 2021-04-30 17:33:25 UTC

Description of problem:

We use nss module winbind as our Linux hosts are joined to AD. When a software upgrade is done on winbind, and winbind is replaced, we restart winbind, but if crond previously loaded the old nss-winbind library because it was executing user jobs, then when the new module is put into place, crond will segfault each time it tries to run user jobs. 

Version-Release number of selected component (if applicable):

1.4.11-23

Steps to Reproduce:
1. Start crond
2. Make crond execute a job for a user who is in AD
3. Update nss-winbind library
4. Wait for cron to execute the next cron job. It will segfault.

Expected results:

I would expect that crond would close and re-open the nss library between runs.

Additional info:

If I restart crond after replacing winbind, there is no problem.