https://bugs.freedesktop.org/show_bug.cgi?id=92103
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:
https://bugzilla.redhat.com/show_bug.cgi?id=1266025
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):
mesa-dri-drivers-10.6.3-3.20150729.fc22.x86_64
How reproducible:
Sometimes
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 }
219
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:
https://bugs.freedesktop.org/show_bug.cgi?id=77402
because it was fixed long ago.
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