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Re: [win-pv-devel] Problems with xenvbd

> -----Original Message-----
> From: win-pv-devel-bounces@xxxxxxxxxxxxxxxxxxxx [mailto:win-pv-devel-
> bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of Rafal Wojdyla
> Sent: 18 August 2015 14:33
> To: win-pv-devel@xxxxxxxxxxxxxxxxxxxx
> Subject: [win-pv-devel] Problems with xenvbd
> Hi,
> I've been testing the current pvdrivers code in preparation for creating
> upstream patches for my xeniface additions and I noticed than xenvbd
> seems to be very unstable for me. I'm not sure if it's a problem with
> xenvbd itself or my code because it seemed to only manifest when the
> full suite of our guest tools was installed along with xenvbd. In short,
> most of the time the system crashed with kernel memory corruption in
> seemingly random processes shortly after start. Driver Verifier didn't
> seem to catch anything. You can see a log from one such crash in the
> attachment crash1.txt.
> Today I tried to perform some more tests but this time without our guest
> tools (only pvdrivers and our shared libraries were installed). To my
> surprise now Driver Verifier was crashing the system every time in
> xenvbd (see crash2.txt). I don't know why it didn't catch that
> previously... If adding some timeout to the offending wait doesn't break
> anything I'll try that to see if I can reproduce the previous memory
> corruptions.

Those crashes do look odd. I'm on PTO for the next week but I'll have a look 
when I get back to the office. I did run verifier on all the drivers a week or 
so back (while running vbd plug/unplug tests) but there have been a couple of 
changes since then.


> --
> RafaÅ WojdyÅa
> Qubes Tools for Windows developer
> https://www.qubes-os.org/
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