Werk #5590: Fixed possible deadlock in shutdown/restart procedure
Component | Livestatus proxy | ||||||||||||||
Title | Fixed possible deadlock in shutdown/restart procedure | ||||||||||||||
Date | Jan 2, 2018 | ||||||||||||||
Level | Trivial Change | ||||||||||||||
Class | Bug Fix | ||||||||||||||
Compatibility | Compatible - no manual interaction needed | ||||||||||||||
Checkmk versions & editions |
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During the shutdown/restart procedure of the livestatus proxy daemon a deadlock could occur. It seems this could rarely happen when the system running the process is under high load together with a large number of sites (>100) configured.
When this situation occures, you can see several left over liveproxyd processes (master + several site processes) which can only be terminated with SIGKILL. When looking at the processes with strace, you can see hanging futex() calls.
Workaround: In such a situation it is safe to simply kill all those processes using SIGKILL and start a clean liveproxyd processes after that.