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Re: [ANNOUNCEMENT] Updated: xorg-server-1.17.1-3


On 01/05/2015 13:43, Ken Brown wrote:
On 5/1/2015 7:56 AM, Jon TURNEY wrote:
On 30/04/2015 23:19, Ken Brown wrote:
On 4/29/2015 1:26 PM, Jon TURNEY wrote:

The following packages have been updated in the Cygwin distribution:

*** xorg-server-*1.17.1-3

I'm finding, on three different 64-bit Cygwin systems, that the server
dies shortly after starting.  I'm attaching XWin.0.log from one of them.
  The log from a 32-bit Cygwin install on the same machine starts the
same but then continues with

[440201.140] winPointerWarpCursor - Discarding first warp: 640 512
[440201.140] (--) 8 mouse buttons found
[440201.140] (--) Setting autorepeat to delay=500, rate=31
[...]

The problem goes away if I revert to 1.17.1-2.  Let me know if there's
further information that I can provide.

That is rather mysterious and disappointing.  I can't reproduce this.

Does this occur if you run XWin directly?

Yes.

If so, could you perhaps upload a strace somewhere, please?

http://sanibeltranquility.com/cygwin/xwin.trace.xz

Thanks.

This ends with ...

--- Process 2996, exception c0000005 at 0000000180155C82

and...

$ addr2line -e /usr/lib/debug/usr/bin/cygwin1.dbg 0x0000000180155C82
/usr/src/debug/cygwin-2.0.1-1/winsup/cygwin/malloc.cc:4753

... which is somewhere inside free().

I don't quite understand why cygwin's exception processing doesn't then catch that exception and raise a SIGSEGV.

However, I did a bit more staring at the changes in 1.17.1-3 and I did find a nasty bug in some code which uses the heap. I've uploaded a snapshot [1] with a possible fix, please test that if you can.

[1] ftp://cygwin.com/pub/cygwinx/x86_64/XWin.20150501-git-b17931db63a48948.exe.bz2

--
Jon TURNEY
Volunteer Cygwin/X X Server maintainer

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