Re: XenVif div by zero on Tx path after resume.

["Durrant, Paul" <xadimgnik@xxxxxxxxx>]

On 22/04/2022 15:17, Martin Harvey wrote:
> -----Original Message-----
> From: Durrant, Paul <xadimgnik@xxxxxxxxx>
> Sent: 22 April 2022 15:13
> To: Martin Harvey <martin.harvey@xxxxxxxxxx>; paul@xxxxxxx; 
> win-pv-devel@xxxxxxxxxxxxxxxxxxxx
> Subject: Re: XenVif div by zero on Tx path after resume.
>
>
> > ... and unfortunately it seems to have been broken for so long my git history 
> > won't tell me when :-(
> Oh dear. Possibly one of those "how did it ever work?" bugs.
>
> If you need testing resource / validation for any patches you'd like to throw 
> my way, I do have a v. good set of automates test cases which will repro the 
> bug (after about 12 hours of CPU grinding), and check that most obvious things 
> aren't broken.
>
> IRQL is such a nightmare: You can get it wrong in one place and the subtly 
> broken CPU state then dies in the next piece of code that needs some level of 
> atomicity.
Probably won't get time to try a patch myself this week. I can take a 
stab next week though.
  Paul