VB failed to open a session

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VB failed to open a session

Postby Muyfa666 » 6. Aug 2016, 18:11

Hi there.

I just installed lastest VB to run Win 10 Preview.

VB crashes with the message "failed to open a session".

I am running the latest Sierra beta.

Any ideas on what could be the cause of this?
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Re: VB failed to open a session

Postby socratis » 6. Aug 2016, 20:51

There are a lot of things that could be going wrong for a message like this. First of all, we need the exact conditions that triggered it (did you try to run the VM?) and the exact message. Even a screenshot would do, if you have to. The unfortunate thing with screenshots is that they're not searchable, that's why it is a last resort.

But you might have a problem with Sierra beta. I don't know. Betas are not usually supported.
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Re: VB failed to open a session

Postby Muyfa666 » 6. Aug 2016, 22:06

I can not even get the VM to start. It crashes instantly.
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Re: VB failed to open a session

Postby socratis » 6. Aug 2016, 22:11

It's funny how you only read the question in parentheses and you skipped all the rest...

Moving to "VirtualBox on Mac OS X pre-releases".
Do NOT send me Personal Messages (PMs) for troubleshooting, they are simply deleted.
Do NOT reply with the "QUOTE" button, please use the "POST REPLY", at the bottom of the form.
If you obfuscate any information requested, I will obfuscate my response. These are virtual UUIDs, not real ones.
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Re: VB failed to open a session

Postby Muyfa666 » 7. Aug 2016, 02:00

The error message is exactly this;

"Failed to open a session for the virtual machine [Name of the VM]."

Then I got a huge error report that is too long to post... :-/
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Re: VB failed to open a session

Postby socratis » 7. Aug 2016, 07:01

Muyfa666 wrote:I got a huge error report that is too long to post...

Big or small, we need it. If it's a text file and it's too bit to post, compress it. And please do not obfuscate the information. It's sort of ... vital, otherwise it wouldn't be there. There is a huge difference between [Name of the VM] being "DOS" and another if it is "Latest test build of Windows 12 experimental".
Do NOT send me Personal Messages (PMs) for troubleshooting, they are simply deleted.
Do NOT reply with the "QUOTE" button, please use the "POST REPLY", at the bottom of the form.
If you obfuscate any information requested, I will obfuscate my response. These are virtual UUIDs, not real ones.
socratis
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Re: VB failed to open a session

Postby loukingjr » 7. Aug 2016, 09:17

FWIW, Windows 10 and other guests run just fine on MacOS Sierra. Other than the audio issue. :roll:
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Re: VB failed to open a session

Postby Muyfa666 » 7. Aug 2016, 10:41

The name of the VM is "Win 10 Preview". I am trying to get Windows 10 Insider Preview Build 14393 running.
Attachments
VM_Error_160806.txt
(84.84 KiB) Downloaded 36 times
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Re: VB failed to open a session

Postby loukingjr » 7. Aug 2016, 13:00

(pic removed)
I should have been more specific…
Last edited by loukingjr on 7. Aug 2016, 15:10, edited 2 times in total.
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Re: VB failed to open a session

Postby Muyfa666 » 7. Aug 2016, 15:05

How do you mean? I can't even get the VM to run, no less install a OS on it.
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Re: VB failed to open a session

Postby loukingjr » 7. Aug 2016, 15:08

A VM can't run until an OS is installed.
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Re: VB failed to open a session

Postby socratis » 7. Aug 2016, 15:57

loukingjr wrote:A VM can't run until an OS is installed.
Yes it can. It won't get you far, but it can run. From what I understood so far is that 'Muyfa666' can't even get to the point where the virtual BIOS takes over. It crashes at inception.

@Muyfa666
Do you get a VBox.log created at the path "<Your_VM>/Logs/" directory? If you do, that's the one I had in mind, I should have been explicit about it. If not, can you please post the output of the command:
    kextstat | grep -v com.apple
Also, the exact version of your OS and VirtualBox version. Finally, please state anything "unusual" done to your OS. From antivirus to MacPorts, to custom Python versions, to... anything. Although as I said again, it's a beta, and as such differences and minute annoyances (like a crash) are in the norm.
Do NOT send me Personal Messages (PMs) for troubleshooting, they are simply deleted.
Do NOT reply with the "QUOTE" button, please use the "POST REPLY", at the bottom of the form.
If you obfuscate any information requested, I will obfuscate my response. These are virtual UUIDs, not real ones.
socratis
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Re: VB failed to open a session

Postby loukingjr » 7. Aug 2016, 16:08

socratis wrote:
loukingjr wrote:A VM can't run until an OS is installed.
Yes it can. It won't get you far, but it can run. From what I understood so far is that 'Muyfa666' can't even get to the point where the virtual BIOS takes over. It crashes at inception.

I guess I never tried. :D
My guess is a third-party app he has installed is causing a problem. Not many would be updated for MacOS. Or could be a bad VB install
All my guests run normally in MacOS Sierra 10.12 Beta (16A270f).

well except for the lack of audio introduced in VB 5.1. I may have mentioned that already. :lol:
OSX, Linux and Windows Hosts & Guests
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Re: VB failed to open a session

Postby socratis » 7. Aug 2016, 16:33

loukingjr wrote:except for the lack of audio

I hear you. Loud and clear ;)
Do NOT send me Personal Messages (PMs) for troubleshooting, they are simply deleted.
Do NOT reply with the "QUOTE" button, please use the "POST REPLY", at the bottom of the form.
If you obfuscate any information requested, I will obfuscate my response. These are virtual UUIDs, not real ones.
socratis
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Posts: 27690
Joined: 22. Oct 2010, 11:03
Location: Greece
Primary OS: Mac OS X other
VBox Version: PUEL
Guest OSses: Win(*>98), Linux*, OSX>10.5

Re: VB failed to open a session

Postby loukingjr » 7. Aug 2016, 16:37

I'm too stubborn to roll back. :shock:
OSX, Linux and Windows Hosts & Guests
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loukingjr
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