[Bug 84500] [radeonsi] radeon 0000:01:00.0: Packet0 not allowed!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84500

--- Comment #28 from Christian König <deathsimple at vodafone.de> ---
(In reply to Alexandre Demers from comment #27)
> (In reply to Christian König from comment #22)
> > Keep in mind that this might actually be a user space problem and that
> > different kernel versions work or don't work only be coincident.
> > 
> > If you can get me an SSH access to the box I could take a look as well.
> > Attaching a debugger to the process in question shouldn't be to hard.
> 
> By the way, if I understand correctly, if the bug is in userspace and was
> introduced around the same time kernel 3.17-rcX went out, would it appears
> when using a previous kernel version? I'm trying to figure out a way to
> distinguish one from the other because from where I am in the bisection, I
> was unable to reproduce the bug with a 3.16 kernel, but it does appear
> before 3.17-rc1...

It is possible that a new kernel let this problem surface by coincident. E.g. a
slightly different memory layout or allocation timing and instead of changing
two random pixel on the screen we change the command buffer and the whole box
crashes and/or shows this error.

All you can do is to try to figure out when the corruption happens. The kernel
copies the command buffer content from userspace to a kernel buffer and then
checks the content of the kernel buffer. Might be a good idea to print the
content of the userspace buffer as well and compare both?

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20141019/1fd1ae97/attachment.html>