Re: [Xen-devel] Using debug-key 'o: Dump IOMMU p2m table, locks up machine

[Santosh Jodh <Santosh.Jodh@xxxxxxxxxx>]

Depending on how many VMs you have and the size of the IOMMU p2m table, it can 
take a while. It should not be infinite though. 

How many VMs do you have running?

Can you please send the serial output when you press 'o'?

Santosh

> -----Original Message-----
> From: Sander Eikelenboom [mailto:linux@xxxxxxxxxxxxxx]
> Sent: Friday, August 31, 2012 2:45 PM
> To: Santosh Jodh; wei.wang2@xxxxxxx
> Cc: xen-devel@xxxxxxxxxxxxx
> Subject: Using debug-key 'o: Dump IOMMU p2m table, locks up machine
> 
> 
> I was trying to use the 'o' debug key to make a bug report about an "AMD-Vi:
> IO_PAGE_FAULT".
> 
> The result:
> - When using "xl debug-keys o", the machine seems in a infinite loop, can
> hardly login, eventually resulting in a kernel RCU stall and complete lockup.
> - When using serial console: I get a infinite stream of "gfn:  mfn: " lines, 
> mean
> while on the normal console, S-ATA devices are starting to give errors.
> 
> So either option trashes the machine, other debug-keys work fine.
> 
> Machine has a 890-fx chipset and AMD phenom x6 proc.
> 
> xl dmesg with bootup and output from some other debug-keys is attached.
> 
> --
> 
> Sander

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