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

[Santosh Jodh <Santosh.Jodh@xxxxxxxxxx>]

The dump should complete - would be curious to see how long it takes on serial 
console. What baudrate is the console running at?

The code does allow processing of pending softirqs quite frequently. I am not 
sure why you are still seeing SATA errors.

> -----Original Message-----
> From: Sander Eikelenboom [mailto:linux@xxxxxxxxxxxxxx]
> Sent: Friday, August 31, 2012 3:43 PM
> To: Santosh Jodh
> Cc: wei.wang2@xxxxxxx; xen-devel@xxxxxxxxxxxxx
> Subject: Re: Using debug-key 'o: Dump IOMMU p2m table, locks up machine
> 
> 
> Saturday, September 1, 2012, 12:24:32 AM, you wrote:
> 
> > 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?
> 
> 15
> 
> > Can you please send the serial output when you press 'o'?
> 
> Attached, to the end you will see the s-ata errors coming through while the
> dump still runs.
> This is not a complete dump, only a few minutes after which i did a hard
> reset.
> 
> > 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
> 
> 
> 
> 
> --
> Best regards,
>  Sander                            mailto:linux@xxxxxxxxxxxxxx

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