I'm having occasional (at least 3, with no clear pattern) "Guru Meditation" notices while running a CentOS VM. It suggests going to the community section on virtualbox dot org, so here I am!
It also suggests providing the contents of the VBox.log, and VBox.png. The PNG is just a black screen (VM console screen saver - only access is generally via web server). The end of the log notes:
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08:05:07.574451 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
08:05:07.574520 emR3Debug: rc=VERR_SVM_IN_USE
08:05:08.574443 Changing the VM state from 'RUNNING' to 'GURU_MEDITATION'.