[pvrusb2] Ability to fully reset a PVRUSB2 Device

[Diego Rivera]

Mike,
As a developer myself, I can fully understand the importance of this discovery!! I have no doubt
that the stack trace differences you're observing are due to offset shifts from the added debug
instructions (they have to be stored somewhere, after all). This is encouraging news!! Thanks for
not giving up!
As always: let me know if there's any way I can help the process!
Cheers!

On Sun, 2019-10-13 at 18:15 -0500, Mike Isely wrote:
> Diego:
> I was *finally* able to reproduce the precise kernel oops you got.  I had to load the exact same
> Ubuntu kernel you are using and the test had to run specifically against an HVR-1950.  The older
> (simpler) device I had been trying won't fail.  But with that said, I got your exact call trace.
> Now that I see the signature, I immediately tested again using a 5.2.13 kernel.org vanilla kernel
> that is larded full of printk() statements in the driver, again on an HVR-1950.  And it blew
> chunks again.  The signature wasn't precisely the same (stack trace is slightly different) but
> it's close enough that I believe it's the same root cause.
> Now the real digging starts.
> Note: This is ignoring the sysfs tear-down collision I had mentioned earlier (which, interestingly
> didn't happen this time, probably because this oops stopped the tear-down before it got that
> far).  This is also with the external userspace I2C access disabled so I can keep that source of
> log noise out of the way, for now.  So there's really 3 issues here.  Trying to focus on the one
> that is burning you specifically.
> If it turns out that what I'm seeing in the 5.2.13 kernel is actually different, well then that
> just means there are 4 problems :-( But right now I'm betting it's the same so that's the avenue
> I'm going to chase.  If I run aground, then I'm going to backtrack to that specific Ubuntu kernel
> and rebuild it with all my debug code added and other config tweaks to help with chasing the
> problem.
>   -Mike
-- 



Diego Rivera

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