[Bug 85116] New: Intel gen6 GPU provoking kernel hang on 3.17.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85116

            Bug ID: 85116
           Summary: Intel gen6 GPU provoking kernel hang on 3.17.1
           Product: DRI
           Version: XOrg CVS
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: nicolashillegeer at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 107965
  --> https://bugs.freedesktop.org/attachment.cgi?id=107965&action=edit
dmesg output after hang + "sudo chvt 1"

This is a cross-post of this bug that I just logged on the kernel bugtracker:
https://bugzilla.kernel.org/show_bug.cgi?id=86451

At first I wasn't sure whether the hang had anything to do with the graphics
chip so I posted it to the kernel bugtracker, but after seeing the dmesg output
it seems more likely that intel DRM might be acting up here. I'll reattach the
dmesg output here for posterity.

Here's the original message of the kernel bug I logged (of course a bit out of
date since I did get some output in dmesg in the end):

First of: I have no idea if "Process Management" is the right topic to put this
under, since I don't know what's causing this. I'm also having a hard time
debugging this as the kernel doesn't print out anything that would signify that
it knows something is wrong. Please change it if need be.

I recently upgraded from 3.15.8 to 3.17.1 and found that everything works fine,
except that after a while, the system partially freezes.

I say partially because I can still connect with ssh and do a lot of things,
such as edit text, run htop, reboot, ...

However, the input devices (such as the keyboard and the mouse) don't respond
anymore, and the screen appears frozen as well. Sometimes the mouse still
responds (and the cursor moves across the screen) but the keyboard presumably
doesn't.

Neither dmesg nor Xorg.0.log show anything out of the ordinary (no errors at
all).

I couldn't use my keyboard to perform ctrl+alt+f1 to switch to the VT and try
something there because the keyboard is unresponsive. So I thought I was being
clever and logged in via ssh then executed "sudo chvt 1". This seemed to hang
for quite a long time (a few minutes at least) and to my surprise did finish
after a while. However, there was no VT greeting me, the screen stayed
unresponsive.

How do I proceed to debug this issue?

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