Werk #5590: Fixed possible deadlock in shutdown/restart procedure

Component Livestatus proxy
Title Fixed possible deadlock in shutdown/restart procedure
Date Jan 2, 2018
Checkmk Edition Checkmk Enterprise (CEE)
Checkmk Version 1.5.0i3
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

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.

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