Werk #5830: Fixed DST shift correction for downtimes, causing CMC to use 100% CPU

Component	Core & setup
Title	Fixed DST shift correction for downtimes, causing CMC to use 100% CPU
Date	Apr 4, 2018
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0p28 Checkmk Enterprise (CEE), Checkmk MSP (CME)

When a downtime was configured to recur every hour and a 1h DST shift happened, the CMC would go into an infinite loop with 100% CPU load and no monitoring at all. If the downtime in question was set in an ad hoc fashion via the GUI (not via rules), the only way to work around this issue was to remove the state file, losing all downtimes, acknowledgements and comments.

To the list of all Werks