The issue on the X11 side:
Program received signal SIGSEGV, Segmentation fault.
RRFirstOutput (pScreen=0x2a1880c0) at randr.c:458
458 if (pScrPriv->primaryOutput && pScrPriv->primaryOutput->crtc)
(gdb) bt full
#0 RRFirstOutput (pScreen=0x2a1880c0) at randr.c:458
pScrPriv = 0x0
output = <optimized out>
i = <optimized out>
j = <optimized out>
#1 0x2a0a5834 in ProcRRGetScreenInfo (client=0x2a233f08) at rrscreen.c:615
stuff = <optimized out>
rep = {type = 232 '\350', setOfRotations = 66 'B', sequenceNumber =
10777, length = 705951608, root = 3204445656, timestamp = 706298576,
configTimestamp = 704846133, nSizes = 0, sizeID = 0,
rotation = 63348, rate = 10771, nrateEnts = 16136, pad = 0}
pWin = 0x2a1b0258
n = <optimized out>
rc = 0
pScreen = 0x2a1880c0
pScrPriv = 0x0
extra = <optimized out>
extraLen = <optimized out>
output = <optimized out>
#2 0x2a09f456 in ProcRRDispatch (client=<optimized out>) at randr.c:493
stuff = <optimized out>
#3 0x2a02eb76 in Dispatch () at dispatch.c:442
clientReady = 0x2a2e81f0
result = 0
client = 0x2a233f08
nready = 0
icheck = 0x2a1430c0
start_tick = 100
#4 0x2a0242ce in main (argc=3, argv=0xbefff824, envp=<optimized out>) at
main.c:287
i = <optimized out>
alwaysCheckForInput = {0, 1}
This happens because the code expects pScrPriv to be available, crashing
X11.
The origin of the problem happens because when X11 starts without any
pvr specific config, both the pvr/omap and fbdev will be loaded and
probed, and as there's no bus specific variable controlling the probe,
it ends up starting both drivers.
As a consequence of having both drivers loaded, X will export 2 screens,
one with (pvr) and one without randr support (fbdev). The expected
pSrcPriv struct comes from randr, so when Qt tries to create a xcb
window on all displays available, X11 crashes trying to access pSrcPriv.
There are a few issues happening at the same time here, as first xorg
shouldn't be loading 2 screens, and the other is that xorg is not
properly validating the pointer before using it's content.
** Summary changed:
- Snowshoe fails with QT5 with a segmentation fault while starting the
application
+ QT5 based applications fails with a segmentation fault with Pandaboard and
the SGX driver
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https://bugs.launchpad.net/bugs/1015292
Title:
QT5 based applications fails with a segmentation fault with Pandaboard
and the SGX driver
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