Bug 64934

Summary:	[llvmpipe] SIGSEGV src/gallium/state_trackers/glx/xlib/glx_api.c:1363
Product:	Mesa	Reporter:	Vinson Lee <vlee>
Component:	Other	Assignee:	mesa-dev
Status:	RESOLVED FIXED	QA Contact:
Severity:	critical
Priority:	medium	Keywords:	have-backtrace
Version:	git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Vinson Lee 2013-05-24 01:40:38 UTC

mesa: b1797c3a3867ab60419bb9ec13dd9cb842edcbe3 (master)

Run glxinfo on llvmpipe on Fedora.

$ glxinfo
Segmentation fault (core dumped)

(gdb) bt
#0  0x00007f457293ea17 in glXDestroyContext (dpy=0x211b540, ctx=0x0)
    at src/gallium/state_trackers/glx/xlib/glx_api.c:1363
#1  0x0000000000403106 in create_context_flags (contextFlags=0, profileMask=1, 
    direct=1, minor=<optimized out>, major=<optimized out>, 
    fbconfig=0x212a3e0, dpy=0x211b540) at glxinfo.c:745
#2  create_context_with_config (dpy=0x211b540, config=0x212a3e0, 
    coreProfile=<optimized out>, direct=1) at glxinfo.c:776
#3  0x000000000040357d in print_screen_info (dpy=dpy@entry=0x211b540, 
    scrnum=scrnum@entry=0, allowDirect=allowDirect@entry=1, 
    coreProfile=coreProfile@entry=1, limits=limits@entry=0, 
    singleLine=singleLine@entry=0, coreWorked=coreWorked@entry=0)
    at glxinfo.c:854
#4  0x00000000004016b4 in main (argc=<optimized out>, argv=<optimized out>)
    at glxinfo.c:1731
(gdb) frame 0
#0  0x00007f457293ea17 in glXDestroyContext (dpy=0x211b540, ctx=0x0)
    at src/gallium/state_trackers/glx/xlib/glx_api.c:1363
1363	   XMesaDestroyContext( glxCtx->xmesaContext );
(gdb) print glxCtx
$1 = (GLXContext) 0x0

Comment 1 Brian Paul 2013-05-24 14:12:00 UTC

I've posted patches to add null pointer checking in glXDestroyContext.

But the latest build of glxinfo wouldn't call glXDestroyContext with a null context either.

In any case, I'm not sure why context creation is failing for you in this case.

Comment 2 Vinson Lee 2014-01-01 05:39:34 UTC

mesa: 5a51c1b01a16d3256f9769a76d8293fea5853b1f (master)

glxinfo on llvmpipe on Fedora works correctly now.

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