Second VB guest does not start

[shinguz]

Since a while (I think since I have upgraded to Ubuntu 14.04) I am not able to start more than 1 VB at the same time any more. The first one starts and works perfectly but when I want to start the second one it fails.

This is reproducesable at any time at will. Please let me know what additional information you want/need.

Error Message:

Failed to open a session for the virtual machine CentOS 6.5 Test2.

No error info.

Result Code: NS_ERROR_CALL_FAILED (0x800706BE)
Component: ProgressProxy
Interface: IProgress {c20238e4-3221-4d3f-8891-81ce92d9f913}

Version 4.3.20 r96996

Linux laptop4 3.13.0-40-generic #69-Ubuntu SMP Thu Nov 13 17:53:56 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Distributor ID: Ubuntu
Description:    Ubuntu 14.04.1 LTS
Release:        14.04
Codename:       trusty

Differences between first and second VB:

Test1

00:00:00.525040 SUP: Loaded VBoxDDR0.r0 (/usr/lib/virtualbox/VBoxDDR0.r0) at 0xffffffffa0a9c020 - ModuleInit at 0000000000000000 and ModuleTerm at 0000000000000000
00:00:00.525816 SUP: Loaded VBoxDD2R0.r0 (/usr/lib/virtualbox/VBoxDD2R0.r0) at 0xffffffffa01f8020 - ModuleInit at 0000000000000000 and ModuleTerm at 0000000000000000

Test2

00:00:00.560737 SUP: Opened VBoxDDR0.r0 (/usr/lib/virtualbox/VBoxDDR0.r0) at 0xffffffffa0a9c020.
00:00:00.560862 SUP: Opened VBoxDD2R0.r0 (/usr/lib/virtualbox/VBoxDD2R0.r0) at 0xffffffffa01f8020.

[shinguz]

Log of the first working VB.

[shinguz]

Log of the second failing VB

[Frank Mehnert]

Please attach the complete VBox.log file of boths VMs.

[aeichner]

Looks like the second VM crashed somewhere. Please reopen if still relevant with a recent VirtualBox release.