How do I fix "Failed to sync vcpu reg" error?

Question

I'm trying to use the Intel HAX x86 emulator for Windows (8, if that matters). I installed everything and created an AVD for the android version, and everything appears correct, but when I run it, I get this output:

Starting emulator for AVD 'x86_QVGA_Level10'
emulator: device fd:1044
HAX is working and emulator runs in fast virt mode
emulator: Failed to sync vcpu reg
emulator: Failed to sync HAX vcpu context

and the emulator won't run. The significant part of this error (Failed to sync vcpu reg) is not mentioned ANYWHERE online, except in the source code for the HAX itself, but I can't figure out how to make any sense of this.

Can anyone advise about how to get past this error? I really need to get this working, because debugging on device and in the default emulators is painfully slow.

Just wanted to note that I was pulled off this project right after asking this question and never had the chance to try any of these solutions, so I don't know what the correct answer is! Should I pick the top voted answer and just accept it? — Joshua Frank, Sep 03 '15 at 13:58

score 372 · Answer 1 · answered Aug 23 '13 at 14:07

372

Make sure you don't have any virtual machines running. In my case, I had genymotion running which was causing this error.

answered Aug 23 '13 at 14:07

JP2014

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This was exactly my problem and solution as well. Thanks! – Heath Borders Nov 13 '14 at 22:02
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Or even having virtualbox opened without any VM running for me – David Santiago Turiño Nov 18 '14 at 16:39
7

Got this issue on Mac. After turn off VBox it started to work. – 0x8BADF00D Feb 18 '15 at 18:24
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Exactly my problem as well, forgot I had a VirtualBox VM running – Bobby Apr 28 '15 at 22:04
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Yep me too, had Genymotion running – Qing Jun 12 '15 at 05:17
I also had to restart my computer ... may have had something else running as well. – Justin Pollard Aug 21 '15 at 17:33
3

I also forgot I was toying with Docker and had a VBox VM running. I launched VirtualBox, stopped the VM and still got the error! I had to quit VirtualBox entirely to launch my emulator. – Cliff Aug 31 '15 at 21:28
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Worked when I stopped Virtualbox with boot2docker. – martins Sep 09 '15 at 10:18
Thanks, should have thought of that. Had a Vagrant box up. – Ben Kane Sep 17 '15 at 16:24
Why can't Genymotion and emulator run at the same time?? – IgorGanapolsky Sep 21 '15 at 08:56
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I had to stop all mu docker machines :( `docker-machine stop ` – jtblin Oct 04 '15 at 22:44
Is there a way to allow VBox running? – JohnnyQ Oct 09 '15 at 17:49
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Might also happen when you are using Docker, check of a Virtualbox instance running in the background. – BastiBen Oct 28 '15 at 09:39
Half a year ago I had the same error and landed on the same answer which i already upvoted, kek. – Nilz11 Aug 10 '16 at 13:27
4

I had Docker (on Mac) running. Stopping it fixed things for me. – Dawson Sep 15 '16 at 21:37
1

In my case I had docker running, after closing it all is working – JustADev Mar 08 '17 at 09:20
OMG Thanks a lot. It was exactly my problem. I spent more than 6 hours searching – Ghassan Karwchan Mar 24 '17 at 01:12
Thank you! Here I had this problem in Mac OS X Sierra 10.12.3 (16D32) and noticed that a native Docker daemon was running.After stopped, it worked seamless. – herrera Apr 18 '17 at 20:56
I tried to configure multiple parameter on the "SDK Settings". I t was not helping. I stopped docker service, which was running in background. Opened virtualbox and closed again. Emulator started working :) – Jasim Muhammed May 14 '17 at 01:31

score 67 · Answer 2 · answered Sep 08 '15 at 23:45

67

I had virtualbox running. Killing the VM allowed allowed the emulator to run.

answered Sep 08 '15 at 23:45

Jerome Anthony

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Thanks, would have never thought of that. Had a Vagrant box up. – Ben Kane Sep 17 '15 at 16:21
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Same here, docker-machine (boot2docker / virtualbox) was running. – tvial Sep 18 '15 at 13:52
Just another confirmation. I stopped my Virtual box instance, and my emulator started right up. FYI my virtual device was using CPU/ABI=x86, and I was running on a macbook pro. – guyland123 Nov 20 '15 at 13:45
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this is really a problem for me.. Im running a php app which provides api in virtual box on my macbook and I can't develop android app which needs to connect to that api... I guess I will need to deploy the php app on some server and develop on that, oh well – Tomáš Tibenský Mar 06 '16 at 11:38
this worked ,my virtualbox was running in background ,now i really want both of them to work – Irfan Ahmad Aug 17 '16 at 13:17

score 61 · Answer 3 · answered Apr 21 '16 at 00:44

61

If you are running Docker you would have to take the virtual machine down

docker-machine stop default

This assumes your docker machine is called default. If you want to check the name use docker-machine ls

A simpler solution; open virtuabox and stop the vm :-)

answered Apr 21 '16 at 00:44

Wow this was it for me. Crazy. How did you figure that out? – Constantine Jun 16 '16 at 19:36
1

researching for the issue on google :-) and adding a little more explanation to it – Jun 17 '16 at 03:34
If you are on a Mac and Docker app is running at the taskbar, close it too, even if docker-machine ls gives you nothing – Theodoros80 Mar 31 '17 at 16:05

score 15 · Answer 4 · edited Aug 19 '15 at 13:04

I had this problem. For me it was the HAXM version.

When you get a new version of HAMX through the SDK Manager, it tells you that it is installed. It is not. You must go to this folder:

<Android SDK>\extras\intel\Hardware_Accelerated_Execution_Manager\

and run intelhaxm-android.exe manually. In my case, I had 1.0.6 and upgraded to 1.1.

I think that what caused the error in the first place was that some other part of the SDK that I had updated needed 1.1.

score 14 · Answer 5 · answered Dec 27 '16 at 03:52

As mentioned by other answers, make sure no VirtualBox and docker service is running with following command in mac. (systemctl in Linux)

$ launchctl list | grep 'VirtualBox\|docker'
-       0   com.docker.helper
640     0   com.docker.docker.2032
31736   0   org.virtualbox.app.VirtualBox.948

If so, kill the VBox and docker service.

launchctl stop org.virtualbox.app.VirtualBox.948
launchctl stop com.docker.docker.2032

score 13 · Answer 6 · edited May 18 '16 at 08:02

13

Stop GENYMOTION (open VirtualBox instance if any instance is running, stop it).
Open AndroidStudio -> Run AVD Manager-> run AndroidStudio virtual device.

Latest Android Emulators are not able to run in parallel with GENYMOTION

edited May 18 '16 at 08:02

pqnet

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answered Nov 29 '15 at 13:59

MANISH PATHAK

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Or stop docker as well – nnhthuan Nov 12 '16 at 00:32

score 9 · Answer 7 · answered Oct 03 '13 at 22:20

"vcpu reg" are "Virtual CPU REGisters" that exist on many processors that have things like multiple cores, hyperthreading, or other features that enable higher layers to believe that there is more than one CPU present when there isn't -- such as today's x86s. No reason to go in to detail -- you can imagine that getting a coherent, single "virtual CPU context" is necessary for the kind of hardware virtualization that HAX offers.

Normally, it's not a problem to run multiple virtual machines of various sorts simultaneously. But if one of them crashes, or misbehaves, or just decides to be a hog, HAX might find that it just can't put together a coherent virtual machine, because it can't sync a virtual CPU context for itself. It'd be like trying to run a real machine with no CPU.

Bottom line is open task manager and kill things that you don't need and that look like they might be holding virtual machine resources. In the worst case, a reboot is almost certain to fix the problem.

score 5 · Answer 8 · answered Dec 10 '16 at 23:56

5

Quick steps:

Stop all VirtualBox Virtual Machines (i.e. vagrant halt), quit VirtualBox.
All docker-machines should be stopped, too. Quit Docker.

answered Dec 10 '16 at 23:56

Jucke

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score 5 · Answer 9 · answered Feb 23 '17 at 10:27

This happened to me also when I was trying to run both VirtualBox and Android emulator in a MacOS machine. As others have mentioned above currently it is not possible to run both (i.e. VirtualBox and X86 -Intel based emulator) in MacOS and not sure about the other platforms. If we need to run both we can choose ARM based emulator. (arm based emulators are normally slow)

score 4 · Answer 10 · answered Jun 23 '13 at 08:10

4

I was getting the same error. I'm guessing there are various reasons for this error, but in my case it was because of a service named ".NCG". The service is Network Content Guard by Inka Entworks, and seems to be some type of DRM solution. Once uninstalled, the emulator worked fine using HAX.

answered Jun 23 '13 at 08:10

Albert Park

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I don't have that software, but it is a good clue about other, similar programs. How on earth did you discover that this was the problem? – Joshua Frank Jun 23 '13 at 14:41

score 4 · Answer 11 · answered Sep 04 '13 at 08:18

4

In my case, it turned out this problem was caused by having a webcam selected as "Front Camera" in the settings for the AVD. Setting it to "Emulated" fixed this problem for me.

answered Sep 04 '13 at 08:18

Roy de Jong

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score 4 · Answer 12 · answered Nov 04 '15 at 12:28

4

I faced this issue because I had my virtual box running with Ubuntu on it. When I shut down my virtual box I did not face this issue.

answered Nov 04 '15 at 12:28

Revs

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thijs · Answer 13 · 2013-06-10T13:33:01.107

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I got the same error on my windows 8 install.

Things you could try:

lower the amount of memory for the emulated device (and/or close other applications)
disable GPU emulation
remove the pass-through webcam

For me, the error occurs when I try to attach a physical webcam to the emulated android instance.

edited Jun 10 '13 at 13:33

answered Jun 10 '13 at 13:07

thijs

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I'll give these a try and report back. Thanks! – Joshua Frank Jun 10 '13 at 18:05
Funny for me was the solution to enable the GPU emulation. – rekire Jun 10 '15 at 13:13

score 3 · Answer 14 · answered Jun 14 '15 at 03:16

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This kept failing until I changed it to [x] Use Host GPU as shown in pic.

AVD Set up

answered Jun 14 '15 at 03:16

raddevus

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Yep - same for me. In the config.ini of the AVD (old one?) the property was set to: hw.gpu.enabled=no. after changing it to yes - everything works :) – icyerasor Dec 22 '15 at 21:06

score 3 · Answer 15 · answered Mar 08 '17 at 05:25

3

I'm running boot2docker vm, just down it solved the issue.

boot2docker down

answered Mar 08 '17 at 05:25

eranga

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score 2 · Answer 16 · answered Nov 21 '13 at 06:06

Make sure you don't have any virtual machines running. In my case, I had genymotion running which was causing this error. when i kill genymotion's Process and kill all Oracle VM VirtualBox related process then it work by wangshiming don't thankyou me

score 2 · Answer 17 · answered Jan 12 '15 at 18:20

2

Ya, i had virtual box running and was getting this error, shutting it down fixed the error.

answered Jan 12 '15 at 18:20

adubey

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score 2 · Answer 18 · answered Mar 26 '15 at 03:30

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I was on a mac and had this problem. I did not think I was running a VM (I have vbox but it isn't running). I restarted my computer and before starting any other apps I tried the emulator and it works fine.

answered Mar 26 '15 at 03:30

chovy

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Exactly, I had vbox running. When I tuned off then emulator start working again. – Ricardo Nov 30 '15 at 23:04

score 2 · Answer 19 · answered Dec 23 '15 at 18:25

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This is the VirtualBox ticket - https://www.virtualbox.org/ticket/14294

answered Dec 23 '15 at 18:25

user213493

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score 2 · Answer 20 · answered Jan 27 '16 at 15:57

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Fixed the problem by changing current version of Java within Windows from Java 8 x64 to Java 7 x86.

answered Jan 27 '16 at 15:57

ruslan.gilmutdinov

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score 2 · Answer 21 · answered Dec 02 '16 at 03:56

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Yes, VirtualBox VMs have to be stopped. I also had to stop Docker for Mac. The error message only mentions VirtualBox, which confused me a little until I realized Docker for Mac is running xhyve.

answered Dec 02 '16 at 03:56

geowa4

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score 2 · Answer 22 · edited May 13 '21 at 12:28

Do you have HP SureClick running? I had the same problem on the HP laptop until I disabled it.

HP SureClick is a security protection program which runs "unsafe" programs in micro-VMs. It may also be called HP Wolf Security on your machine, which is the new name for it, although under the hood (e.g. folders, dialogs etc) it's still called SureClick. It may have some processes visible in Task Manager with a prefix of "Br", which stands for Bromium.

Similarly to other answers, it cannot be running at the same time as Android Emulator, as it is basically a virtual machine.

Here are some steps to disable it (not all may be required but this worked for me):

Right click on "HP SureClick" or "HP Wolf" in your system tray and select "Disable Threat Containment". It will pop up a dialog asking for the reason (optional), so just click OK
Right click on the icon again and select "Disable Malware Protection"
Click Start, type "services", open the Services window and set all "HP SureClick" services to disabled by right-clicking on each -> Properties -> change startup type to Disabled (for me there were 3 such services)
Restart the computer

After doing this, I was able to use Android Emulator again :)

Please elaborate your solution more precisely, with details about disabling. — momt99, Apr 30 '20 at 17:17
@momt99 I added a lot more details to the answer, hopefully it's clearer now and helps some people — Adam Burley, May 13 '21 at 12:28

score 1 · Answer 23 · answered Jun 17 '13 at 09:45

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If your CPU supports throttling (like Intel's SpeedStep) try to disable that feature in your BIOS. It's kind of a quickfix but at least it worked.

answered Jun 17 '13 at 09:45

Johannes Ewald

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It seems like CPU throttling is not responsible for this error. The error appears in my case if a VirtualBox VM is currently running. – Johannes Ewald Jun 18 '13 at 13:01

score 1 · Answer 24 · answered Sep 26 '13 at 15:30

I think it must be a variety of reasons cause this failure. In my case, since I installed the Google input method software, "Failed to sync vcpu reg" appeared. This was the one and only change before normal working. So, after uninstall the Google Input software, it was recovered.just a little reference, although I can't believe this solution for long time either.

score 1 · Answer 25 · answered Dec 18 '13 at 18:22

1

I had the Windows Virtual PC running (on Windows of course). Once I turned off, the emulator went fine.

Hope this helps.

answered Dec 18 '13 at 18:22

Jorge E. Hernández

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score 1 · Answer 26 · answered Jul 15 '15 at 12:58

1

I was trying to launch a Gingerbread 2.3.3 x86 emulator and it would not launch. Changing from x86 to arm made the problem go away.

answered Jul 15 '15 at 12:58

Daniel Wilson

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This fixed it for me. Just switching to ARM. Thanks! – rhand Jul 26 '15 at 05:23

score 1 · Answer 27 · answered Oct 17 '15 at 15:48

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For me, the only thing that worked using adv on MacOs Yosemite, is setting the processor to ARM (native CPU of the device - standard 4" Nexus).

answered Oct 17 '15 at 15:48

Oleg Belousov

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score 1 · Answer 28 · answered Jan 14 '16 at 17:55

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If you are having any virtual machines running, suspend them and try again.

answered Jan 14 '16 at 17:55

Arun Abraham

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score 1 · Answer 29 · answered Jan 17 '16 at 02:26

For me the answer was to set Enable keyboard input to true under the advanced settings of the virtual device.

This was the first option I changed on the device, so it is possible that the act of changed an option fixes the error as well based on the wide array of answers above.

Note: I've confirmed previously that no VM's are running.

score 0 · Answer 30 · answered May 29 '14 at 09:53

Finally, I found the anwer for this question. I had exactly the same problem and it was completely solved.

Virtual device or webcam is rarely the cause of your problem.

Just install mainboard chipset driver.

I recommend you to use 3DP chipset autoinstaller.

Good luck!

score 0 · Answer 31 · answered Jul 06 '14 at 22:38

0

For me it was google appengine running locally.

answered Jul 06 '14 at 22:38

LILkillaBEE

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marvatron · Answer 32 · 2015-05-02T03:42:55.037

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It seems like in your environment variables on your system (for me on Window 7), setting the "Path" system variable (not user variable) to "sdk_install_location\tools\lib" e.g: "C:\Users\android_sdk\tools\lib" solved the problem for me.

Check out the "Tips and Tricks" section at this webpage: https://software.intel.com/en-us/android/articles/installation-instructions-for-intel-hardware-accelerated-execution-manager-windows for more info (if link is dead/doesn't work just google "Installation Instructions for Intel HAX").

edited May 02 '15 at 03:42

answered May 01 '15 at 21:53

marvatron

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While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. – Shaiful Islam May 01 '15 at 21:59

score 0 · Answer 33 · answered Jun 23 '15 at 20:07

For those developers whose local environment leverages a VM (e.g. Homestead), simply halt the VM before launching the Android emulator. Restarting it after will allow both to run in parallel, but you're likely going to run into severe performance issues.

score -1 · Answer 34 · answered Dec 18 '14 at 01:09

-1

I reduced the size of the VM memory allocated and it seems to have fixed it.

answered Dec 18 '14 at 01:09

thisrunson

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This answer would be improved if you would provide guidance on _how_ to reduce the VM size. – William Price Dec 18 '14 at 01:18
thisrunson meant to say the VM Heap -- Although it would've helped if mentioned the size set to. Mine i s at 64 default. But that wasn't my problem. I had to turn on [x] Use Host GPU – raddevus Jun 14 '15 at 03:14

How do I fix "Failed to sync vcpu reg" error?

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