This seems to happen here when compiz tries to create an empty texture
(0x0), see bt at http://pastebin.ubuntu.com/7027036/
Some highlights:
#9 0x00007fbfc0f16429 in unity::compiz_utils::PixmapTexture::PixmapTexture
(this=0x227a968, w=0, h=0) at
/home/marco/Dev/unity/trunk/unity-shared/CompizUtils.cpp:115
The text buffer has random geometries at this point:
#2 drisw_update_tex_buffer (drawable=<optimized out>, ctx=<optimized out>,
res=<optimized out>) at
../../../../../../../src/gallium/state_trackers/dri/sw/drisw.c:320
dPriv = <optimized out>
st_ctx = <optimized out>
pipe = 0xc33200
transfer = 0x2dd5490
x = 36615400
y = 0
w = -711233149
h = 32703
ximage_stride = 1450034700
line = 32702
cpp = <optimized out>
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https://bugs.launchpad.net/bugs/1055166
Title:
compiz crashed with SIGSEGV in memmove() from
drisw_update_tex_buffer() from dri_set_tex_buffer2() from operator()
from compiz::opengl::bindTexImageGLX() from ... from
unity::UnityWindow::DrawWindowDecoration
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