Bug#814722: Some new info

[Julien Cristau <jcristau@debian.org>]

Control: severity -1 important

On Sat, Feb 20, 2016 at 18:43:08 -0300, Fabián Inostroza wrote:

> After the update of xserver-common and xserver-xorg-core from 1.18.0-3 to
> 1.18.1-1 things have gone better, X stills crash sometimes but no so
> repeteadly.
> Also I have found that the crashes happens when I'm using MATLAB (2013a),
> while maximizing window or changing tab in the editor.
> 
[...]
> [   323.935] (EE) Backtrace:
> [   323.935] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4e) [0x562710a8db2e]
> [   323.935] (EE) 1: /usr/lib/xorg/Xorg (0x5627108d8000+0x1b9eb9) [0x562710a91eb9]
> [   323.935] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f89ec772000+0x33590) [0x7f89ec7a5590]
> [   323.935] (EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (0x7f89ec772000+0x79d7c) [0x7f89ec7ebd7c]
> [   323.935] (EE) 4: /lib/x86_64-linux-gnu/libc.so.6 (realloc+0xf0) [0x7f89ec7ed190]
> [   323.935] (EE) 5: /usr/lib/xorg/Xorg (ReadRequestFromClient+0x4f0) [0x562710a90aa0]
> [   323.935] (EE) 6: /usr/lib/xorg/Xorg (0x5627108d8000+0x53a21) [0x56271092ba21]
> [   323.936] (EE) 7: /usr/lib/xorg/Xorg (0x5627108d8000+0x57af3) [0x56271092faf3]
> [   323.936] (EE) 8: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7f89ec792870]
> [   323.936] (EE) 9: /usr/lib/xorg/Xorg (_start+0x29) [0x562710919e89]
> [   323.936] (EE) 
> [   323.936] (EE) Segmentation fault at address 0x17

That looks like memory corruption to me.  If you can still readily
reproduce the crash, it might be useful to try running the server with
valgrind.  And please report this upstream following
https://01.org/linuxgraphics/documentation/how-report-bugs and let us
know the bug number.

Cheers,
Julien