QEmu Script Error Checking

I have run into the following issue where the tap device is in use due to the QEmu machine unexpectedly crashing. The error I recieve is here:

http://i.imgur.com/5t9U1.png (appologies for the screenshot but it wouldn't let me copy the text)

Is there any leaway for more robust error checking or a way to forcibly destroy the tap node to allow a new one to be created?

Cheers,
Jack.
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I have run into the following issue where the tap device is in use due to the QEmu machine unexpectedly crashing. The error I recieve is here:

http://i.imgur.com/5t9U1.png (appologies for the screenshot but it wouldn't let me copy the text)

Is there any leaway for more robust error checking or a way to forcibly destroy the tap node to allow a new one to be created?

Quoted 8 lines · Jack Mitchell

I have run into the following issue where the tap device is in use due to the QEmu machine unexpectedly crashing. The error I recieve is here:

http://i.imgur.com/5t9U1.png (appologies for the screenshot but it wouldn't let me copy the text)

Is there any leaway for more robust error checking or a way to forcibly destroy the tap node to allow a new one to be created?

Hi Jack,

Since qemu is being run from a parent shell script (runqemu), if qemu were to crash, I would think the parent shell script would continue on and destroy the tap device normally. Might you be killing the runqemu process instead of qemu itself?

I'm not sure if there is a way we could reliably force a cleanup of tap devices when runqemu starts, because we need to support the case where multiple instances of qemu sessions are running simultaneously (each with their own tap device). Off the top of my head I think this would make the state of tap devices non-deterministic.

Furthermore, we support a mode where an administrator can set up one or more tap devices, allowing the runqemu user to not need sudo privileges. So checking for the case where a tap device exists but no qemu process is running wouldn't work.

Scott

Quoted 8 lines · Jack Mitchell

I have run into the following issue where the tap device is in use due to the QEmu machine unexpectedly crashing. The error I recieve is here:

http://i.imgur.com/5t9U1.png (appologies for the screenshot but it wouldn't let me copy the text)

Is there any leaway for more robust error checking or a way to forcibly destroy the tap node to allow a new one to be created?

Hi Jack,

Since qemu is being run from a parent shell script (runqemu), if qemu were to crash, I would think the parent shell script would continue on and destroy the tap device normally. Might you be killing the runqemu process instead of qemu itself?

I'm not sure if there is a way we could reliably force a cleanup of tap devices when runqemu starts, because we need to support the case where multiple instances of qemu sessions are running simultaneously (each with their own tap device). Off the top of my head I think this would make the state of tap devices non-deterministic.

Furthermore, we support a mode where an administrator can set up one or more tap devices, allowing the runqemu user to not need sudo privileges. So checking for the case where a tap device exists but no qemu process is running wouldn't work.

Scott

Hi Jack,

When and how did you trigger the error. It looks more like a CDT issue than a Yocto issue, but can you tell us more what exactly you were doing with Yocto plug-in while this crash happened? So you mean when you click on the debug, it caused qemu crashes? Or the qemu crashed 1st. then you got the eclipse error msg.

Thanks,
Jessica

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Jack Mitchell
Sent: Wednesday, October 12, 2011 3:12 AM
To: [email protected]
Subject: Re: [yocto] QEmu Script Error Checking

Quoted 22 lines · Scott Garman

Quoted 8 lines · Jack Mitchell

I have run into the following issue where the tap device is in use due to the QEmu machine unexpectedly crashing. The error I recieve is here:

http://i.imgur.com/5t9U1.png (appologies for the screenshot but it wouldn't let me copy the text)

Is there any leaway for more robust error checking or a way to forcibly destroy the tap node to allow a new one to be created?

Hi Jack,

Since qemu is being run from a parent shell script (runqemu), if qemu were to crash, I would think the parent shell script would continue on and destroy the tap device normally. Might you be killing the runqemu process instead of qemu itself?

I'm not sure if there is a way we could reliably force a cleanup of tap devices when runqemu starts, because we need to support the case where multiple instances of qemu sessions are running simultaneously (each with their own tap device). Off the top of my head I think this would make the state of tap devices non-deterministic.

Quoted 7 lines

Furthermore, we support a mode where an administrator can set up one or more tap devices, allowing the runqemu user to not need sudo privileges. So checking for the case where a tap device exists but no qemu process is running wouldn't work.

Scott

Ok, thank you for the information Scott. I think I found the issue today which is causing the QEmu script to terminate pre-maturely.

I am using the eclipse-poky master branch as my eclipse plugin and it threw an error today when I tried to debug - which coincided with the QEmu and terminal window terminating. The errror I recieved was:

!SESSION 2011-10-12 09:22:49.135
-----------------------------------------------
eclipse.buildId=I20110613-1736
java.version=1.6.0_22
java.vendor=Sun Microsystems Inc.

BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_GB
Framework arguments:  -product org.eclipse.sdk.ide
Command-line arguments:  -product org.eclipse.sdk.ide -data

/home/developer/jackdaw/../runtime-EclipseApplication -dev file:/home/developer/jackdaw/.metadata/.plugins/org.eclipse.pde.core/Eclipse Application/dev.properties -os linux -ws gtk -arch x86_64 -consoleLog

!ENTRY org.eclipse.cdt.debug.mi.core 4 42 2011-10-12 09:24:47.192
!MESSAGE Internal Error
!STACK 0
org.eclipse.cdt.debug.mi.core.cdi.MI2CDIException: Inferior terminated[]
at
org.eclipse.cdt.debug.mi.core.cdi.SharedLibraryManager.getMIShareds(SharedLibraryManager.java:123)
at
org.eclipse.cdt.debug.mi.core.cdi.SharedLibraryManager.updateState(SharedLibraryManager.java:188)
at
org.eclipse.cdt.debug.mi.core.cdi.SharedLibraryManager.update(SharedLibraryManager.java:136)
at
org.eclipse.cdt.debug.mi.core.cdi.EventManager.processSuspendedEvent(EventManager.java:326)
at
org.eclipse.cdt.debug.mi.core.cdi.EventManager.update(EventManager.java:100)
at java.util.Observable.notifyObservers(Observable.java:159)
at
org.eclipse.cdt.debug.mi.core.MISession.notifyObservers(MISession.java:791)
at org.eclipse.cdt.debug.mi.core.EventThread.run(EventThread.java:46)

Which looks like a CDT bug or the interfacing with CDT. I could file a bug report if you think it is related to the poky-eclipse plugin?

Cheers,
Jack.
_______________________________________________
yocto mailing list
[email protected]
https://lists.yoctoproject.org/listinfo/yocto

Hi Jack,

When and how did you trigger the error. It looks more like a CDT issue than a Yocto issue, but can you tell us more what exactly you were doing with Yocto plug-in while this crash happened? So you mean when you click on the debug, it caused qemu crashes? Or the qemu crashed 1st. then you got the eclipse error msg.

Thanks,
Jessica

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Jack Mitchell
Sent: Wednesday, October 12, 2011 3:12 AM
To: [email protected]
Subject: Re: [yocto] QEmu Script Error Checking

Quoted 22 lines · Scott Garman

Quoted 8 lines · Jack Mitchell

I have run into the following issue where the tap device is in use due to the QEmu machine unexpectedly crashing. The error I recieve is here:

http://i.imgur.com/5t9U1.png (appologies for the screenshot but it wouldn't let me copy the text)

Is there any leaway for more robust error checking or a way to forcibly destroy the tap node to allow a new one to be created?

Hi Jack,

Since qemu is being run from a parent shell script (runqemu), if qemu were to crash, I would think the parent shell script would continue on and destroy the tap device normally. Might you be killing the runqemu process instead of qemu itself?

I'm not sure if there is a way we could reliably force a cleanup of tap devices when runqemu starts, because we need to support the case where multiple instances of qemu sessions are running simultaneously (each with their own tap device). Off the top of my head I think this would make the state of tap devices non-deterministic.

Quoted 7 lines

Furthermore, we support a mode where an administrator can set up one or more tap devices, allowing the runqemu user to not need sudo privileges. So checking for the case where a tap device exists but no qemu process is running wouldn't work.

Scott

Ok, thank you for the information Scott. I think I found the issue today which is causing the QEmu script to terminate pre-maturely.

I am using the eclipse-poky master branch as my eclipse plugin and it threw an error today when I tried to debug - which coincided with the QEmu and terminal window terminating. The errror I recieved was:

!SESSION 2011-10-12 09:22:49.135
-----------------------------------------------
eclipse.buildId=I20110613-1736
java.version=1.6.0_22
java.vendor=Sun Microsystems Inc.

BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_GB
Framework arguments:  -product org.eclipse.sdk.ide
Command-line arguments:  -product org.eclipse.sdk.ide -data

/home/developer/jackdaw/../runtime-EclipseApplication -dev file:/home/developer/jackdaw/.metadata/.plugins/org.eclipse.pde.core/Eclipse Application/dev.properties -os linux -ws gtk -arch x86_64 -consoleLog

!ENTRY org.eclipse.cdt.debug.mi.core 4 42 2011-10-12 09:24:47.192
!MESSAGE Internal Error
!STACK 0
org.eclipse.cdt.debug.mi.core.cdi.MI2CDIException: Inferior terminated[]
at
org.eclipse.cdt.debug.mi.core.cdi.SharedLibraryManager.getMIShareds(SharedLibraryManager.java:123)
at
org.eclipse.cdt.debug.mi.core.cdi.SharedLibraryManager.updateState(SharedLibraryManager.java:188)
at
org.eclipse.cdt.debug.mi.core.cdi.SharedLibraryManager.update(SharedLibraryManager.java:136)
at
org.eclipse.cdt.debug.mi.core.cdi.EventManager.processSuspendedEvent(EventManager.java:326)
at
org.eclipse.cdt.debug.mi.core.cdi.EventManager.update(EventManager.java:100)
at java.util.Observable.notifyObservers(Observable.java:159)
at
org.eclipse.cdt.debug.mi.core.MISession.notifyObservers(MISession.java:791)
at org.eclipse.cdt.debug.mi.core.EventThread.run(EventThread.java:46)

Which looks like a CDT bug or the interfacing with CDT. I could file a bug report if you think it is related to the poky-eclipse plugin?

Cheers,
Jack.
_______________________________________________
yocto mailing list
[email protected]
https://lists.yoctoproject.org/listinfo/yocto