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Description of problem: this is issue related to Bug 1371205 Version-Release number of selected component (if applicable): systemd-219-30.el7.x86_64 How reproducible: rarely, but its reproducible Steps to Reproduce: 1. # modprobe dummy # for i in $(seq 1 1 30000); do (ip li add dummy$i type dummy &); echo $i; done 2. right away with no delay try: # systemctl daemon-reload Failed to execute operation: Connection timed out 3. wait 1 minute 4. one single command `systemctl daemon-reload` works with no issue 5. for i in `seq 1 10`; do systemctl daemon-reload; done # it shows error later or sooner Actual results: systemctl daemon-reload Failed to execute operation: Connection timed out Expected results: Failed to execute operation: Connection timed out. Try again later :) or some magic Additional info:
The systemctl command interacts with pid 1 via DBus. In the example given, it looks like the increase in devices is causing systemd some difficulty in enumerating and storing state for all of them as they are emitted from the kernel. On top of that, it also has to wake up and pass state information over to NetworkManager in the instance of dummy interfaces, and so that adds a bit more churn between systemd and DBus. This is what I would assume is a fairly rare occurrence under normal operation.
When Red Hat shipped 7.7 on Aug 6, 2019 Red Hat Enterprise Linux 7 entered Maintenance Support 1 Phase. https://access.redhat.com/support/policy/updates/errata#Maintenance_Support_1_Phase That means only "Critical and Important Security errata advisories (RHSAs) and Urgent Priority Bug Fix errata advisories (RHBAs) may be released". This BZ does not appear to meet Maintenance Support 1 Phase criteria so is being closed WONTFIX. If this is critical for your environment please open a case in the Red Hat Customer Portal, https://access.redhat.com, provide a thorough business justification and ask that the BZ be re-opened for consideration in the next minor release. Please see comment 4 for an explanation as to why this is likely occurring.