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Date: Tue, 06 Dec 2011 21:51:32 -0500
From: Ken Brown <kbrown AT cornell DOT edu>
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Subject: Re: [ANNOUNCEMENT] CALL FOR TESTING: Cygwin 1.7.10
References: <announce DOT 20111206093746 DOT GA6222 AT calimero DOT vinschen DOT de> <4EDE52F7 DOT 2080206 AT cornell DOT edu> <20111206175752 DOT GA16033 AT calimero DOT vinschen DOT de> <4EDE5EDF DOT 60102 AT cornell DOT edu> <20111206200224 DOT GB16033 AT calimero DOT vinschen DOT de>
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On 12/6/2011 3:02 PM, Corinna Vinschen wrote:
> On Dec  6 13:28, Ken Brown wrote:
>> On 12/6/2011 12:57 PM, Corinna Vinschen wrote:
>>> On Dec  6 12:37, Ken Brown wrote:
>>>> On 12/6/2011 4:37 AM, Corinna Vinschen wrote:
>>>>> A lot of changes and fixes have been made in Cygwin since 1.7.9 has
>>>>> been released, so we're looking forward to release Cygwin 1.7.10 soon.
>>>>>
>>>>> Please test the latest developer snapshots at http://cygwin.com/snapshots/
>>>>> which should have "Release Candidate" quality.
>>>>
>>>> Here's an easily reproducible problem with the 2011-12-05
>>>> cygwin1.dll snapshot:
>>>>
>>>> 1. Download cygwin-inst-20111205.tar.bz2 .
>>>>
>>>> 2. Start mintty from the Cygwin Terminal shortcut.
>>>>
>>>> 3. tar -C/ -xf /path/to/cygwin-inst-20111205.tar.bz2
>>>> --exclude=usr/bin/cygwin1.dll
>>>>
>>>> An hourglass appears and tar doesn't run.  I'm on W7-64 if that
>>>> makes a difference.
>>>
>>> Works for me.  I just tried from mintty with bash as login shell as
>>> well as with tcsh as login shell.  I even left out the --exclude and
>>> it worked ;)
>>>
>>> Does that really occur reproducible on your machine, every try?
>>
>> Yes.  And I just tried twice more with the same behavior.  Earlier
>> today I had a similar thing occur on a different machine, on which
>> the 2011-12-04 dll was installed instead of the 2011-12-05 dll.  On
>> that machine (again W7-64), the mintty window simply disappeared
>> when I gave the tar command.
>
> Hmm, that's weird.
>
>> The only other detail I can think of is that I started mintty by
>> right-clicking on the shortcut and choosing "Run as administrator".
>
> Still works for me.  That's puzzeling.  Any chance to debug that?
> Stracing, attaching with GDB, building your own debug-enabled Cygwin,
> etc?

I ran the tar command under strace.  I'm not good at deciphering strace 
output, but you can see it here:

   http://www.math.cornell.edu/~kbrown/cygwin/strace.out

A few further observations:

- As the strace output shows, tar does in fact run, contrary to what I 
originally thought; it's just that there's no indication in the terminal 
that tar finished.

- When I finally get tired of waiting and kill mintty (and the 
associated bash process) from another terminal, mintty leaves the 
following stackdump on the desktop:

Exception: STATUS_ACCESS_VIOLATION at eip=610CD8B1
eax=0000010C ebx=0028C880 ecx=00000000 edx=0000010C esi=00000000 
edi=0028C860
ebp=0028C7C8 esp=0028C790 program=C:\cygwin\bin\mintty.exe, pid 4972, 
thread main
cs=0023 ds=002B es=002B fs=0053 gs=002B ss=002B
Stack trace:
Frame     Function  Args
0028C7C8  610CD8B1  (0000010C, 0028C95C, 0028C880, 0028C860)
0028C938  610CDC42  (00000002, 0028C95C, 00000000, 00000000)
20052168  610D1FE5  (00630072, 00000000, 00000018, 00000033)
200524F0  00000000  (6E776F72, 6D64612D, 2E2F6E69, 746E696D)
End of stack trace

- Other mintty windows that are open become unusable.  The title bar 
shows "not responding".

Does any of this help?  Should I be stracing mintty rather than tar?

Ken

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