dumping Xen stack

dumping Xen stack

[Zytaruk, Kelly]

Does Xen have an equivalent function to the Linux dump_stack() function?

I am hitting a panic followed by a reboot and would like to find out where I am coming from.

Thanks,
Kelly

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Re: dumping Xen stack

[Andrew Cooper]

On 09/05/16 17:37, Zytaruk, Kelly wrote:
> Does Xen have an equivalent function to the Linux dump_stack() function?
>
> I am hitting a panic followed by a reboot and would like to find out where I am coming from.

At the point of a crash, the stack should be printed on the console.

Alternatively, show_execution_state() at any point should dump the Xen
register/stack.

~Andrew

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Re: dumping Xen stack

[Zytaruk, Kelly]

> -----Original Message-----
> From: Andrew Cooper [mailto:andrew.cooper3@citrix.com]
> Sent: Monday, May 09, 2016 12:40 PM
> To: Zytaruk, Kelly; xen-devel@lists.xen.org
> Subject: Re: [Xen-devel] dumping Xen stack
> 
> On 09/05/16 17:37, Zytaruk, Kelly wrote:
> > Does Xen have an equivalent function to the Linux dump_stack() function?
> >
> > I am hitting a panic followed by a reboot and would like to find out where I am
> coming from.
> 
> At the point of a crash, the stack should be printed on the console.

The only thing I am seeing on the console is the panic message followed by the system will reboot in 5 sec.
> 
> Alternatively, show_execution_state() at any point should dump the Xen
> register/stack.

I looked up show_execution_state() and show_trace() and they both require a pointer to registers.
I am hitting a panic during boot in queue_invalidate_wait() in .../drivers/passthrough/vtd/qinval.c .  I am not sure how to get the register pointer from here.

> 
> ~Andrew
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Re: dumping Xen stack

[Andrew Cooper]

On 09/05/16 18:11, Zytaruk, Kelly wrote:
>
>> -----Original Message-----
>> From: Andrew Cooper [mailto:andrew.cooper3@citrix.com]
>> Sent: Monday, May 09, 2016 12:40 PM
>> To: Zytaruk, Kelly; xen-devel@lists.xen.org
>> Subject: Re: [Xen-devel] dumping Xen stack
>>
>> On 09/05/16 17:37, Zytaruk, Kelly wrote:
>>> Does Xen have an equivalent function to the Linux dump_stack() function?
>>>
>>> I am hitting a panic followed by a reboot and would like to find out where I am
>> coming from.
>>
>> At the point of a crash, the stack should be printed on the console.
> The only thing I am seeing on the console is the panic message followed by the system will reboot in 5 sec.

Ah - plain panic()s don't automatically dump register/stack information.

>> Alternatively, show_execution_state() at any point should dump the Xen
>> register/stack.
> I looked up show_execution_state() and show_trace() and they both require a pointer to registers.
> I am hitting a panic during boot in queue_invalidate_wait() in .../drivers/passthrough/vtd/qinval.c .  I am not sure how to get the register pointer from here.

Oops sorry - I meant dump_execution_state() which takes no parameters.

~Andrew

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Re: dumping Xen stack

[Zytaruk, Kelly]

> -----Original Message-----
> From: Andrew Cooper [mailto:andrew.cooper3@citrix.com]
> Sent: Monday, May 09, 2016 1:14 PM
> To: Zytaruk, Kelly; xen-devel@lists.xen.org
> Subject: Re: [Xen-devel] dumping Xen stack
> 
> On 09/05/16 18:11, Zytaruk, Kelly wrote:
> >
> >> -----Original Message-----
> >> From: Andrew Cooper [mailto:andrew.cooper3@citrix.com]
> >> Sent: Monday, May 09, 2016 12:40 PM
> >> To: Zytaruk, Kelly; xen-devel@lists.xen.org
> >> Subject: Re: [Xen-devel] dumping Xen stack
> >>
> >> On 09/05/16 17:37, Zytaruk, Kelly wrote:
> >>> Does Xen have an equivalent function to the Linux dump_stack() function?
> >>>
> >>> I am hitting a panic followed by a reboot and would like to find out
> >>> where I am
> >> coming from.
> >>
> >> At the point of a crash, the stack should be printed on the console.
> > The only thing I am seeing on the console is the panic message followed by the
> system will reboot in 5 sec.
> 
> Ah - plain panic()s don't automatically dump register/stack information.
> 
> >> Alternatively, show_execution_state() at any point should dump the
> >> Xen register/stack.
> > I looked up show_execution_state() and show_trace() and they both require a
> pointer to registers.
> > I am hitting a panic during boot in queue_invalidate_wait() in
> .../drivers/passthrough/vtd/qinval.c .  I am not sure how to get the register
> pointer from here.
> 
> Oops sorry - I meant dump_execution_state() which takes no parameters.

That is exactly what I am looking for.  Thx.

> 
> ~Andrew
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