Cherry-pick #22827 to 7.x: [Auditbeat] system/socket: Monitor all online CPUs #22872
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Auditbeat's system/socket dataset needs to install kprobes on all online CPUs. Previously, it was using runtime.NumCPU() to determine the CPUs in the system, and monitoring CPUs 0 to NumCPU. This was a mistake that lead to startup failures or loss of events in any of the following scenarios: - When Auditbeat is started with a CPU affinity mask that excludes some CPUs - When there are offline or isolated CPUs in the system. This patch updates the tracing library in Auditbeat to fetch the list of online CPUs from /sys/devices/system/cpu/online so that it can install kprobes in all of them regardless of its own affinity mask, and correctly skipping offline CPUs. Related elastic#18755 (cherry picked from commit 6356887)
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leehinman
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Dec 3, 2020
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Cherry-pick of PR #22827 to 7.x branch. Original message:
What does this PR do?
This patch updates the tracing library in Auditbeat to fetch the list of online CPUs from
/sys/devices/system/cpu/onlineso that it can install kprobes in all of them regardless of its own affinity mask, and correctly skipping offline CPUs.Why is it important?
Auditbeat's system/socket dataset needs to install kprobes on all online CPUs.
Previously, it was using Go's
runtime.NumCPU()to determine the CPUs in the system, and monitoring CPUs0toNumCPU-1. This was a mistake that lead to startup failures or loss of events in any of the following scenarios:Checklist
[ ] I have made corresponding changes to the documentation[ ] I have made corresponding change to the default configuration filesCHANGELOG.next.asciidocorCHANGELOG-developer.next.asciidoc.How to test this PR locally
Easier way to reproduce is to start Auditbeat with a CPU affinity mask that excludes the first CPU and only allows it to run on the second CPU:
This will pin Auditbeat to CPU1 while kprobes will be installed to CPU0, preventing guesses to work.
Alternatively, one can disable a few CPUs before launching Auditbeat:
Related issues
Related #18755
This PR fixes most of the problems reported in the above issue, but the main issue is fixed by #22787