With latest CVS (drm/Mesa/xorg) get euphoria from the rss glx screensaver package, Run it, run gears, drag gears over top of euphoria, euphoria segfaults... I'll attach a backtrace.
[Switching to Thread -1209914880 (LWP 27260)] 0xb7d82ab6 in _generic_read_RGBA_span_BGRA8888_REV_SSE2 () from /storage/dri/Mesa/lib//r200_dri.so (gdb) bt #0 0xb7d82ab6 in _generic_read_RGBA_span_BGRA8888_REV_SSE2 () from /storage/dri/Mesa/lib//r200_dri.so #1 0xb7cb5c98 in r200ReadRGBASpan_ARGB8888_SSE2 (ctx=0x3ffff79f, n=256, x=0, y=257, rgba=0xbfff75f0) at spantmp2.h:452 #2 0xb7d4e2f9 in _swrast_read_rgba_span (ctx=0x80817f0, buffer=0x821c708, n=256, x=-1073741836, y=83, rgba=0xbfff75f0) at swrast/s_span.c:1369 #3 0xb7d4bfb5 in read_rgba_pixels (ctx=0x80817f0, x=0, y=83, width=0, height=0, format=0, type=0, pixels=0x0, packing=0x0) at swrast/s_readpix.c:442 #4 0x00000000 in ?? ()
May be a duplicate of https://bugs.freedesktop.org/show_bug.cgi?id=2317 which I reported against the Mesa product (because the code in question is outside the driver itself). If it is a duplicate, then it shouldn't matter whether it's a glxgears or any other window you move over euphoria. As a workaround try defining MESA_NO_ASM=1 in the environment.
*** This bug has been marked as a duplicate of 2317 ***
Mass version move, cvs -> git
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