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Re: [ANNOUNCEMENT] Updated: xorg-server-1.17.1-3
- From: Jon TURNEY <jon dot turney at dronecode dot org dot uk>
- To: Ken Brown <kbrown at cornell dot edu>, cygwin at cygwin dot com
- Date: Fri, 01 May 2015 19:19:49 +0100
- Subject: Re: [ANNOUNCEMENT] Updated: xorg-server-1.17.1-3
- Authentication-results: sourceware.org; auth=none
- References: <announce dot 55411449 dot 7020106 at dronecode dot org dot uk> <5542AA7E dot 5070504 at cornell dot edu> <55436A0A dot 2010603 at dronecode dot org dot uk> <554374FF dot 7060708 at cornell dot edu>
- Reply-to: cygwin at cygwin dot com
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:
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?
If so, could you perhaps upload a strace somewhere, please?
This ends with ...
--- Process 2996, exception c0000005 at 0000000180155C82
$ addr2line -e /usr/lib/debug/usr/bin/cygwin1.dbg 0x0000000180155C82
... 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  with a possible fix, please test that if you can.
Volunteer Cygwin/X X Server maintainer
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