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Date:	Mon, 25 Jun 2012 10:37:53 +0200
From:	marco atzeri <marco DOT atzeri AT gmail DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: crash on latest cygwin snapshot
References:	<4FE786DA DOT 2050208 AT gmail DOT com> <20120625043110 DOT GA28607 AT ednor DOT casa DOT cgf DOT cx> <4FE81478 DOT 8030508 AT gmail DOT com> <20120625080550 DOT GC2976 AT calimero DOT vinschen DOT de>
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On 6/25/2012 10:05 AM, Corinna Vinschen wrote:
> On Jun 25 09:34, marco atzeri wrote:
>> On 6/25/2012 6:31 AM, Christopher Faylor wrote:
>>> On Sun, Jun 24, 2012 at 11:30:02PM +0200, marco atzeri wrote:
>>>> Cgf, Corinna,
>>>>
>>>> while building latest atlas  I hit a bug that is crashing all the
>>>> running cygwin process.
>>>> It crashes on 20120619 snapshot and also latest cvs source.
>>>> No issue on 20120611 snapshot.
>>>>
>>>> The binary to replicate and a extract of the strace's is at
>>>> http://matzeri.altervista.org/works/atlas/
>>>>
>>>> on W7/64 just run this command
>>>> ---------------------------------------------------------------------
>>>>   ./xprobe_comp -v 2 -o atlconf.txt -O 9 -A 25 -Si nof77 0 -V 448  -Fa
>>>> ic '-fno-common' -Fa sm '-fno-common' -Fa dm '-fno-common' -Fa sk
>>>> '-fno-common' -Fa dk '-fno-common' -Fa xc '-fno-common' -Fa gc
>>>> '-fno-common' -Fa if '-fno-common' -b 32 -d b .
>>>> ----------------------------------------------------------------------
>>>>
>>>> no stackdump is generated.
>>>
>>> I think I need a better test case.
>>
>> I was afraid of that.
>> xprobe_comp is a sytem/processor probe and it is really
>> resource consuming during its normal run.
>>
>> I tried to strace but it produces an enormous amount of data
>>
>> $ ls -sh1  xprobe_comp.strace*
>> 330M xprobe_comp.strace_fail
>> 761M xprobe_comp.strace_good
>>
>> and there is no guarantee that the root cause is traced.
>
> Does the failing strace contain a line like this?
>
>    --- Process 3708, exception C0000094 at 00401198
>
> If so, it might give a clue.  There's a chance that an exception
> generates another exception, so you might have more than one such
> line.  The first one rules.  Did you try from CVS again with cgf's
> latest patch?
>
>
> Corinna
>

Hi Corinna,
Tested up to
http://cygwin.com/ml/cygwin-cvs/2012-q2/msg00129.html

There are no exceptions on the strace.

The last portion, ~ 500 lines, of strace is available here:
http://matzeri.altervista.org/works/atlas/

together with the equivalent area of the good strace (~ 1000 lines).

A normal exception should kill just the running process, while
I see that  xprobe_comp, bash, mintty are killed and
also others bash and mintty processes are taking down.

Regards
Marco



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