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	1.5.0i3 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i3 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i3 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i3 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i3 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i3 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i3 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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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