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Description of problem:
A customer reported tons of "pmdalinux" and "pmdaproc" zombies on his system, with "pmdaroot" being the parent.
I do not see any code in "pmdaroot" to reap the zombies or ignore sigchild.
Version-Release number of selected component (if applicable):
pcp-4.1.0-5.el7_6.x86_64
How reproducible:
Always, with pmie.service disabled
Steps to Reproduce:
1. Start pcmd
# systemctl start pmcd
2. Kill a child
# pkill pmdaproc
# ps -eaf | grep pmdaproc
Actual results:
root 12819 12818 0 15:29 ? 00:00:00 [pmdaproc] <defunct>
Expected results:
No zombie
Additional info:
Apparently enabling pmie.service makes pmdaroot reap somehow the zombies.
Fixed upstream now, thanks Renaud.
commit c12aea5448810a4719f46a92a1c11f624311719e
Author: Nathan Scott <nathans>
Date: Thu Apr 11 10:49:23 2019 +1000
pmdaroot: ensure zombie PMDA processes are reaped
PMDAs started by pmdaroot that exit unexpectedly (i.e.
not usual pmdaroot mechanisms) were not being correctly
waited for - add a non-blocking waitpid call into the
pmdaroot main loop to harvest any children.
QA test 1218 is added to expose the problem and also to
exercise the fix.
Resolves Red Hat BZ #1698517.
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-2019:2111