Windows Host Unresponsive when trying to start second VM with VMMR0.r0 ( VMMR0+1447c )

[Peggy]

I have 2 Virtual servers I need to spin up at the same time. They are Oracle Linux images for Peoplesoft applications. Sometimes I can get both running and other times, I get the first one running and the other guest starts to boot but then the host becomes unresponsive and I have to power reset it. I have dump files from the last occurrence. Using Windows Debugger with the mini dump file seems to points to VMMR0.r0. I will post what log files I can but it seems like it does not actually write a log for the server that crashes the host (random as to which one).

*******************************************************************************
*                        Bugcheck Analysis                                    *
*******************************************************************************
BugCheck 3B, {c000001d, fffff8009641747c, ffffd0019be86cd0, 0}

*** WARNING: Unable to verify timestamp for VMMR0.r0
*** ERROR: Module load completed but symbols could not be loaded for VMMR0.r0
*** WARNING: Unable to verify timestamp for VBoxDrv.sys
*** ERROR: Module load completed but symbols could not be loaded for VBoxDrv.sys
Probably caused by : VMMR0.r0 ( VMMR0+1447c )

[Peggy]

There was a second occurrence of this again yesterday. Two VMs were running, and a new third VM was created and started. It starts to boot but then the host becomes unresponsive and I had to power reset the host. I have the guest VM log file for that and am attaching it, along with the dump.

[aeichner]

Please reopen if this is still an issue with a recent VirtualBox release.