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

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

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

Attachment: output-debug-keys-o.txt
Description: Text document

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