Re: Linux-x86-64 and cairo crash

[Riccardo Mottola]

Hi Eric,

Eric Wasylishen wrote:
> Hm..
> The segfault in cairo_get_target is probably coming from passing NULL to that 
> function. I made an adjustment to drawGState so it won't call cairo_get_target 
> until after checking that the cairo context is non-NULL.
>
> The thing I don't understand is "invalid value for stride" error. I attached a patch to 
> apply to back which should print a warning at the source of the "invalid value for 
> stride"… hopefully that narrows it down. btw, I tried but wasn't able to reproduce this on my 
> x86-64 linux system with a 16-bit Xephyr display :-(
>    
With your patch, the result is the one pasted below. Interestingly, the 
behaviour of the application Ink changed: it doesn't crash anymore, but 
it displays a big black window as the document window and a black rect 
for the menu with some garbage pixels in it. The menu is "responsive". I 
could even quit.

I can give acceso to this machien, but the display is not local, but 
exported... this means that if you export it to your machine the problem 
will not reproduce. I would need to start up both the X client and X 
server machine. Possible, but I prefer to do it on a specified time/moment.

Riccardo

(moria:~) multix% Ink
2011-09-12 18:24:27.305 Ink[2906] No local time zone specified.
2011-09-12 18:24:27.305 Ink[2906] Using time zone with absolute offset 0.
2011-09-12 18:24:27.304 Ink[2906] Cairo status 'invalid value for 
stride' in DPSinitgraphics
2011-09-12 18:24:27.314 Ink[2906] XShm not supported, XShmAttach() failed.
2011-09-12 18:24:27.314 Ink[2906] Falling back to normal XImage (will be 
slower).
2011-09-12 18:24:27.314 Ink[2906] Cairo status 'invalid value for 
stride' in DPSinitgraphics
2011-09-12 18:24:27.315 Ink[2906] The font specified for NSFont, 
FreeSans, can't be found.
2011-09-12 18:24:27.355 Ink[2906] Cairo status 'invalid value for 
stride' in DPSinitgraphics
2011-09-12 18:24:27.357 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:27.361 Ink[2906] Cairo status 'invalid value for 
stride' in DPSinitgraphics
2011-09-12 18:24:27.364 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:27.419 Ink[2906] The font specified for NSFont, 
FreeSans, can't be found.
2011-09-12 18:24:27.437 Ink[2906] The font specified for NSFont, 
FreeSans, can't be found.
2011-09-12 18:24:27.443 Ink[2906] The font specified for NSFont, 
FreeSans, can't be found.
2011-09-12 18:24:27.443 Ink[2906] The font specified for NSFont, 
FreeSans, can't be found.
2011-09-12 18:24:27.628 Ink[2906] Cairo status 'invalid value for 
stride' in DPSinitgraphics
2011-09-12 18:24:27.634 Ink[2906] Cairo status 'invalid value for 
stride' in DPSinitgraphics
2011-09-12 18:24:27.637 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:27.637 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:27.637 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:27.637 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:27.638 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:27.638 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:27.760 Ink[2906] The font specified for NSFont, 
FreeSans, can't be found.
2011-09-12 18:24:27.770 Ink[2906] Cairo status 'invalid value for 
stride' in DPSinitgraphics
2011-09-12 18:24:29.832 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:29.835 Ink[2906] Cairo status 'invalid value for 
stride' in DPSinitgraphics
2011-09-12 18:24:29.838 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:29.840 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:29.840 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:29.840 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:29.841 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:29.841 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:29.841 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:30.655 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:30.656 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:30.656 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:30.656 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:30.656 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))
2011-09-12 18:24:30.657 Ink[2906] WARNING: -drawGState called with a 
NULL target context ((null)) or source context ((null))