After leaving the VM idle for some time, it crashed on its own. Type Manifest File: /home/user/.VirtualBox/xpti.dat nsNativeComponentLoader: autoregistering begins. nsNativeComponentLoader: autoregistering succeeded nNCL: registering deferred (0) !!Assertion Failed!! Expression: pTimer->enmClock == TMCLOCK_VIRTUAL_SYNC ? enmState == TMTIMERSTATE_ACTIVE : enmState == TMTIMERSTATE_PENDING_SCHEDULE || enmState == TMTIMERSTATE_PENDING_STOP_SCHEDULE Location : /var/tmp/portage/app-emulation/virtualbox-5.1.26/work/VirtualBox-5.1.26/src/VBox/VMM/include/TMInline.h(36) void tmTimerQueueUnlinkActive(PTMTIMERQUEUE, PTMTIMER) Trace/breakpoint trap
Please reopen if this still affects 5.2.x