Bug#847073: X doesn't start with new xserver-xorg-video-intel

[James Clarke <jrtc27@jrtc27.com>]

> On 5 Dec 2016, at 12:05, Emilio Pozuelo Monfort <pochu27@gmail.com> wrote:
> 
> On 05/12/16 12:27, James Clarke wrote:
>> Package: xserver-xorg-video-intel
>> Version: 2:2.99.917+git20161105-1
>> Severity: important
>> Tags: patch upstream
>> Control: retitle -1 segfaults due to missing NULL check in has_connector_backlight
>> 
>> This looks like [1] was reached with dir being NULL, though since you don't
>> have debugging symbols (and I don't know/can't seem to work out what address
> 
> What's wrong with xserver-xorg-video-intel-dbg ?

I was being an idiot; I had unpacked -dbg, but pointed addr2line at the stripped
library...

debian:xserver-xorg-video-intel james% addr2line -e root/usr/lib/debug/usr/lib/xorg/modules/drivers/intel_drv.so 0x74502
/build/xserver-xorg-video-intel-CxTaWA/xserver-xorg-video-intel-2.99.917+git20161105/build/src/sna/../../../src/sna/sna_display.c:1036

So yes, this was the problem (though I wasn't really in any doubt after seeing the
source).

James