Mail Archives: cygwin/2011/12/08/08:12:54
On 12/8/2011 1:52 AM, Christopher Faylor wrote:
> On Wed, Dec 07, 2011 at 10:18:40PM -0500, Ken Brown wrote:
>> On 12/7/2011 6:13 PM, Christopher Faylor wrote:
>>> On Wed, Dec 07, 2011 at 08:03:22AM -0500, Ken Brown wrote:
>>>> On 12/6/2011 10:22 PM, Christopher Faylor wrote:
>>>>> On Tue, Dec 06, 2011 at 09:51:32PM -0500, Ken Brown wrote:
>>>>>> 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?
>>>>>
>>>>> Apparently yes. I can't reproduce this either. The strace you provided
>>>>> does look perfectly normal.
>>>>
>>>> OK. I started mintty from the Cygwin Terminal shortcut, attached strace
>>>> to it in a second terminal, and ran the tar command in the first
>>>> terminal. The strace output is at
>>>>
>>>> http://www.math.cornell.edu/~kbrown/cygwin/strace_mintty.out
>>>>
>>>> Here's one more data point: The problem occurs only in a mintty started
>>> >from the shortcut. If I start mintty from an existing mintty, I can run
>>>> the tar command without a problem.
>>>
>>> Still can't duplicate it.
>>>
>>> I can see that mintty is having problems but it isn't clear why.
>>>
>>> I'm going to generate a new snapshot with more debugging. Could you
>>> give it a try when it shows up?
>>>
>>> I'd like to see both the above stack dump, if you get it and another
>>> snapshot.
>>
>> Here's the stack dump:
>>
>> Exception: STATUS_ACCESS_VIOLATION at eip=610CD8B1
>> eax=0000010C ebx=0028C880 ecx=00000000 edx=0000010C esi=00000000
>> edi=0028C860
>> ebp=0028C7C8 esp=0028C7A0 program=C:\cygwin\bin\mintty.exe, pid 4396,
>> 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 610CDD87 (00000002, 0028C95C, 00000000, 0028C860)
>> 20052208 610D2045 (00630072, 00000000, 00000018, 00000033)
>> 20052590 00000000 (6E776F72, 6D64612D, 2E2F6E69, 746E696D)
>> End of stack trace
>>
>> And the strace output is at
>>
>> http://www.math.cornell.edu/~kbrown/cygwin/strace_20111208_snap.out
>>
>> By the way, ssh doesn't work with this snapshot; I get the error message
>> "PRNG is not seeded" when I run "ssh user AT host", and I also can't start
>> sshd. (/var/log/sshd.log contains the same "PRNG is not seeded" error
>> message.)
>
> Sigh. I screwed up select() so the test is suspect.
No problem. I redid the test:
$ uname -a
CYGWIN_NT-6.1-WOW64 fiona 1.7.10s(0.255/5/3) 20111208 06:50:31 i686 Cygwin
$ cat ~kbrown-admin/*.stackdump
Exception: STATUS_ACCESS_VIOLATION at eip=610CD801
eax=0000010C ebx=0028C880 ecx=00000000 edx=0028C95C esi=00000000
edi=0028C860
ebp=0028C7C8 esp=0028C7A0 program=C:\cygwin\bin\mintty.exe, pid 6532,
thread main
cs=0023 ds=002B es=002B fs=0053 gs=002B ss=002B
Stack trace:
Frame Function Args
0028C7C8 610CD801 (0000010C, 0028C95C, 0028C880, 0028C860)
0028C938 610CDB76 (00000002, 0028C95C, 00000000, 00000000)
20052208 610D1F25 (00630072, 00000000, 00000018, 00000033)
20052590 00000000 (6E776F72, 6D64612D, 2E2F6E69, 746E696D)
End of stack trace
The strace output is still at
http://www.math.cornell.edu/~kbrown/cygwin/strace_20111208_snap.out
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