KVM 32bit support broken in SVN?

KVM 32bit support broken in SVN?

[Anthony Liguori]

I've been tracking down a rather strange SEGV in SVN.  I'm on a 32bit 
SVM system.  I think people are seeing the same on 32bit VMX.

Basically, we get to the first EINTR returned by kvm_run().  Everything 
goes as expected until we get to cpu_loop_exit().  When we get to this 
point, the jmp_buf appears to be invalid as the longjmp() goes off into 
a bad high address.

Still trying to track down but wanted to share what I've found.

Regards,

Anthony Liguori

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Re: KVM 32bit support broken in SVN?

[Daniel Hecken]

Hello!

I can confirm what Anthony tracked down. Avi or anybody else, do you
have an idea what the cause can be?

Daniel Hecken

Anthony Liguori schrieb:
> I've been tracking down a rather strange SEGV in SVN.  I'm on a 32bit 
> SVM system.  I think people are seeing the same on 32bit VMX.
> 
> Basically, we get to the first EINTR returned by kvm_run().  Everything 
> goes as expected until we get to cpu_loop_exit().  When we get to this 
> point, the jmp_buf appears to be invalid as the longjmp() goes off into 
> a bad high address.
> 
> Still trying to track down but wanted to share what I've found.
> 
> Regards,
> 
> Anthony Liguori
> 
> -------------------------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier.
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642


-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier.
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Re: KVM 32bit support broken in SVN?

[Avi Kivity]

Anthony Liguori wrote:
> I've been tracking down a rather strange SEGV in SVN.  I'm on a 32bit 
> SVM system.  I think people are seeing the same on 32bit VMX.
>
> Basically, we get to the first EINTR returned by kvm_run().  Everything 
> goes as expected until we get to cpu_loop_exit().  When we get to this 
> point, the jmp_buf appears to be invalid as the longjmp() goes off into 
> a bad high address.
>
> Still trying to track down but wanted to share what I've found.
>
>   

It looks like %ebp (which is used to hold the global env variable) is 
corrupted.





-- 
error compiling committee.c: too many arguments to function


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Re: KVM 32bit support broken in SVN?

[Avi Kivity]

Anthony Liguori wrote:
> I've been tracking down a rather strange SEGV in SVN.  I'm on a 32bit 
> SVM system.  I think people are seeing the same on 32bit VMX.
>
> Basically, we get to the first EINTR returned by kvm_run().  Everything 
> goes as expected until we get to cpu_loop_exit().  When we get to this 
> point, the jmp_buf appears to be invalid as the longjmp() goes off into 
> a bad high address.
>
> Still trying to track down but wanted to share what I've found.
>
>   

This is now fixed (or rather worked around, as the fix changes libkvm.a 
where it shouldn't).


-- 
error compiling committee.c: too many arguments to function


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