Bug 32528

Summary:	X server crashes in VMware guest when KDE started with kwin "OpenGLIsUnsafe=false"
Product:	Mesa	Reporter:	Hugh Daschbach <hdasch>
Component:	Drivers/X11	Assignee:	mesa-dev
Status:	RESOLVED INVALID	QA Contact:
Severity:	normal
Priority:	medium
Version:	7.9
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Hugh Daschbach 2010-12-20 08:15:27 UTC

X server running in a VMware guest crashes (SIGSEGV) during KDE initialization.  Here's the backtrace. 

Backtrace:
[ 82931.960] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80e5e7b]
[ 82931.960] 1: /usr/bin/X (0x8048000+0x5cd35) [0x80a4d35]
[ 82931.960] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb771840c]
[ 82931.960] 3: /usr/lib/xorg/modules/libfb.so (fbBltStip+0x73) [0xb72ca3f3]
[ 82931.960] 4: /usr/lib/xorg/modules/libfb.so (fbGetImage+0x199) [0xb72cf679]
[ 82931.960] 5: /usr/lib/xorg/modules/drivers/vmwlegacy_drv.so (0xb72f5000+0x6c44) [0xb72fbc44]
[ 82931.960] 6: /usr/bin/X (0x8048000+0x15f86d) [0x81a786d]
[ 82931.960] 7: /usr/lib/xorg/modules/extensions/libglx.so (0xb7312000+0x3814b) [0xb734a14b]
[ 82931.960] 8: /usr/lib/xorg/modules/dri/swrast_dri.so (0xaedde000+0xf81c) [0xaeded81c]
[ 82931.960] 9: /usr/lib/xorg/modules/dri/swrast_dri.so (0xaedde000+0xf887) [0xaeded887]
[ 82931.960] 10: /usr/lib/xorg/modules/extensions/libglx.so (0xb7312000+0x380ad) [0xb734a0ad]
[ 82931.960] 11: /usr/lib/xorg/modules/extensions/libglx.so (0xb7312000+0x34802) [0xb7346802]
[ 82931.960] 12: /usr/lib/xorg/modules/extensions/libglx.so (0xb7312000+0x3567a) [0xb734767a]
[ 82931.960] 13: /usr/lib/xorg/modules/extensions/libglx.so (0xb7312000+0x3766f) [0xb734966f]
[ 82931.960] 14: /usr/bin/X (0x8048000+0x27187) [0x806f187]
[ 82931.960] 15: /usr/bin/X (0x8048000+0x1a1b5) [0x80621b5]
[ 82931.960] 16: /lib/libc.so.6 (__libc_start_main+0xe6) [0xb743dc76]
[ 82931.960] 17: /usr/bin/X (0x8048000+0x19d91) [0x8061d91]
[ 82931.960] Segmentation fault at address (nil)
[ 82931.960] 
Fatal server error:
[ 82931.961] Caught signal 11 (Segmentation fault). Server aborting

Comment 1 Hugh Daschbach 2010-12-20 08:25:25 UTC

Before finding that it's common to simply disable OpenGL in .kde4/share/config/kwinrc:

    OpenGLIsUnsafe=true

I poked around the crash a bit.  I believe the crash happens when swrastSetTexBuffer2() passes a NULL texImage->Data value down to sPriv->swrast_loader->getImage().  Here's the backtrace from gdb just before the crash:


Breakpoint 1, 0xb747da06 in VMWAREGetImage ()
   from /usr/lib/xorg/modules/drivers/vmwlegacy_drv.so
(gdb) bt
#0  0xb747da06 in VMWAREGetImage ()
   from /usr/lib/xorg/modules/drivers/vmwlegacy_drv.so
#1  0x081a786d in miSpriteGetImage ()
#2  0xb74cc14b in swrastGetImage ()
   from /usr/lib/xorg/modules/extensions/libglx.so
#3  0xaef6f81c in swrastSetTexBuffer2 (pDRICtx=0xa31e888, target=3553, 
    texture_format=8410, dPriv=0xa0a9068) at swrast.c:97
#4  0xaef6f887 in swrastSetTexBuffer (pDRICtx=0xa31e888, target=3553, 
    dPriv=0xa0a9068) at swrast.c:106
#5  0xb74cc0ad in __glXDRIbindTexImage ()
   from /usr/lib/xorg/modules/extensions/libglx.so
#6  0xb74c8802 in __glXDisp_BindTexImageEXT ()
   from /usr/lib/xorg/modules/extensions/libglx.so
#7  0xb74c967a in __glXDisp_VendorPrivate ()
   from /usr/lib/xorg/modules/extensions/libglx.so
#8  0xb74cb66f in __glXDispatch ()
   from /usr/lib/xorg/modules/extensions/libglx.so
#9  0x0806f187 in Dispatch ()
#10 0x080621b5 in main ()
(gdb) c
Continuing.

Now that I've turned on OpenGLIsSafe, this isn't a big issue for me.  But I'm left wondering, is this a bug, an incomplete feature, or an unsupported configuration?  Is it an itch worth scratching further?

Comment 2 Hugh Daschbach 2010-12-20 08:28:27 UTC

One more thing.  This is Arch Linux running Mesa built from the 7.9 git tree at dc4956922dfbec2fb2f60539be97760022bd4613.  I tried backporting to the 7.9 tar file and had similar results.

Comment 3 Miklos Vajna 2011-01-07 18:34:57 UTC

Just wanted to note that I can reproduce this as well. As an interesting addition, the same occurs on my Lenovo Ideapad S12 netbook, too (which has a Via card, so I guess it uses the same software renderer).

Comment 4 Adam Jackson 2019-09-18 15:59:05 UTC

Ancient bug, closing.

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