Bug 9080

Summary:	glxinfo causes graphics lockup on mga G450
Product:	xorg	Reporter:	3rg34mw02
Component:	Driver/mga	Assignee:	Tilman Sauerbeck <tilman>
Status:	RESOLVED WONTFIX	QA Contact:	Xorg Project Team <xorg-team>
Severity:	normal
Priority:	high	CC:	ajax, idr, jeremyhu
Version:	unspecified
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:	2011BRB_Reviewed
i915 platform:		i915 features:

Description 3rg34mw02 2006-11-19 15:39:07 UTC

When running with 3d acceleration turned on on a gentoo system using
xorg-server-1.1.99.902 with xf86-video-mga-1.4.4 on a Matrox G450, running
glxinfo crashes the X server, leaving the computer in a state the only rebooting
can recover from.  (I don't have another computer I could use to log in to it
via the network, so I can't tell the exact state.)  Oddly, some 3d programs
(such as glxgears) work fine.

Configuration and log files attached to the gentoo bug here:
<https://bugs.gentoo.org/show_bug.cgi?id=155444>

May be related to the freedesktop bug 8666, but notice that in my case glxgears
(and some other 3d programs) work, while glxinfo crashes.  The traceback of the
crash is:

Backtrace:
0: /usr/bin/X(xf86SigHandler+0x84) [0x80c0334]
1: [0xb7f3d420]
2: /usr/lib/xorg/modules/extensions//libGLcore.so(XMesaCreateContext+0x7d)
[0xb0cca10d]
3: /usr/lib/xorg/modules/extensions//libGLcore.so [0xb0cc6fe7]
4: /usr/lib/xorg/modules/extensions//libglx.so(DoCreateContext+0x10f)
[0xb7bff94f]
5: /usr/lib/xorg/modules/extensions//libglx.so [0xb7bffb44]
6: /usr/lib/xorg/modules/extensions//libglx.so [0xb7c01a0c]
7: /usr/bin/X [0x813c7de]
8: /usr/bin/X(Dispatch+0x1ab) [0x808685b]
9: /usr/bin/X(main+0x489) [0x806e619]
10: /lib/libc.so.6(__libc_start_main+0xd8) [0xb7cbd878]
11: /usr/bin/X(FontFileCompleteXLFD+0xa5) [0x806d951]

Fatal server error:
Caught signal 11.  Server aborting

Like bug 8666, this is followed by lots of "(EE) MGA(0): [dri] Idle timed out,
resetting engine...", and the system is locked up.

Comment 1 Ian Romanick 2006-11-22 10:59:20 UTC

Looking at that stack trace, it appears that the crash only happens with
indirect rendering.  If I'm not mistaken, it should never go into libGLcore with
direct rendering.

Can you try running "LIBGL_ALWAYS_INDIRECT=y glxgears"?  If my hunch is correct,
that will reproduce the crash.

Comment 2 3rg34mw02 2006-11-22 21:52:03 UTC

I tried "env LIBGL_ALWAYS_INDIRECT=y glxgears" (I use tcsh rather than bash),
and there was no crash.  (Also, when I'm running with xinerama turned on, which
disables DRI, then 3d applications don't crash X, though of course they
generally run unacceptably slowly.)

However, on a whim I tried running "env LIBGL_ALWAYS_INDIRECT=n glxgears", and I
did get a crash, though the traceback is different:

Backtrace:
0: X(xf86SigHandler+0x84) [0x80c0334]
1: [0xb7f8a420]
2: /usr/lib/dri/mga_dri.so(__driUtilUpdateDrawableInfo+0x137) [0xb3117297]
3: /usr/lib/dri/mga_dri.so(mgaUpdateRects+0xc0) [0xb311fd40]
4: /usr/lib/dri/mga_dri.so(mgaGetLock+0x7b) [0xb315f65b]
5: /usr/lib/dri/mga_dri.so [0xb311bcba]
6: /usr/lib/dri/mga_dri.so(_mesa_Clear+0x17f) [0xb327de3f]
7: /usr/lib/xorg/modules/extensions//libglx.so [0xb7c51979]
8: /usr/lib/xorg/modules/extensions//libglx.so(DoRender+0x175) [0xb7c4a575]
9: /usr/lib/xorg/modules/extensions//libglx.so [0xb7c4a5fa]
10: /usr/lib/xorg/modules/extensions//libglx.so [0xb7c4ea0c]
11: X [0x813c7de]
12: X(Dispatch+0x1ab) [0x808685b]
13: X(main+0x489) [0x806e619]
14: /lib/libc.so.6(__libc_start_main+0xd8) [0xb7d0a878]
15: X(FontFileCompleteXLFD+0xa5) [0x806d951]

Setting LIBGL_ALWAYS_INDIRECT to either y or n had no effect on the glxinfo
crash that I could tell.

Comment 3 Daniel Stone 2007-02-27 01:34:46 UTC

Sorry about the phenomenal bug spam, guys.  Adding xorg-team@ to the QA contact so bugs don't get lost in future.

Comment 4 Bryce Harrington 2007-06-20 18:48:06 UTC

We're getting a similar backtrace on a Dimension E520 when running with the vesa driver:  https://bugs.launchpad.net/xorg-server/+bug/119341

Comment 5 Bryce Harrington 2007-09-17 10:31:01 UTC

The bug from comment #4 was resolved due to a backported patch as of xserver 12ubuntu4

Comment 6 Jeremy Huddleston Sequoia 2011-10-02 23:06:34 UTC

Is this still an issue?

Comment 7 Adam Jackson 2014-04-08 13:45:17 UTC

glcore is no longer a thing, and neither is mga's 3d support.

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.