[Bug 92103] [PATCH] Sigsegv in i965 driver (get_stencil_miptree), plasma crashes after login

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Sep 24 05:33:24 PDT 2015


            Bug ID: 92103
           Summary: [PATCH] Sigsegv in i965 driver (get_stencil_miptree),
                    plasma crashes after login
           Product: Mesa
           Version: 10.6
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: ugilio at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 118428
  --> https://bugs.freedesktop.org/attachment.cgi?id=118428&action=edit
Stack trace

This bug was originally reported on RedHat's bugzilla for Fedora 22:

Description of problem:
On the machine I use at work sometimes plasma crashes after the login, before
showing the KDE desktop. Investigation with gdb might have shown the cause of
the problem.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. In KDM, perform the login

Actual results:
Sometimes plasma crashes before showing the desktop

Expected results:
Plasma should start and show the desktop

Additional info:
I Launched gdb from the KDE crash handler (drkonqi?), see attached stack trace.
The crash happened at brw_misc_state.c:215, that is:

(gdb) list
210     static struct intel_mipmap_tree *
211     get_stencil_miptree(struct intel_renderbuffer *irb)
212     {
213        if (!irb)
214           return NULL;
215        if (irb->mt->stencil_mt)
216           return irb->mt->stencil_mt;
217        return irb->mt;
218     }

It turns out that irb->mt was null:

(gdb) print irb->mt
$3 = (struct intel_mipmap_tree *) 0x0

I modified the line to read

if (irb->mt && irb->mt->stencil_mt)

(see the attached patch) and so far (a couple of restarts, a shutdown, and a
tenth of logouts/logins) no crash happened.

However, since the crash is not always reproducible, I cannot be 100% sure.

The video card is

00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset
Integrated Graphics Controller (rev 03)

I am using the intel driver with UXA acceleration method (not SNA).
Glxinfo says:

server glx vendor string: SGI
server glx version string: 1.4
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) G45/G43 
OpenGL version string: 2.1 Mesa 10.6.3 (git-ccef890)
OpenGL shading language version string: 1.20
OpenGL ES profile version string: OpenGL ES 2.0 Mesa 10.6.3 (git-ccef890)
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 1.0.16

I think this is not a duplicate of bugs like this:
because it was fixed long ago.

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You are the QA Contact for the bug.
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