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Subject:	Re: /dev/p* causes shell crash in i686
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From:	Thomas Wolff <towo AT towo DOT net>
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Date:	Thu, 10 Sep 2020 21:41:25 +0200
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Am 10.09.2020 um 21:38 schrieb Ken Brown via Cygwin:
> On 9/10/2020 3:31 PM, Thomas Wolff wrote:
>> Am 10.09.2020 um 21:19 schrieb Ken Brown via Cygwin:
>>> On 9/10/2020 3:15 PM, Andrew Schulman via Cygwin wrote:
>>>>> On Sep  9 08:08, Andrew Schulman via Cygwin wrote:
>>>>>> Here's a strange one. In bash in i686, try to run:
>>>>>>
>>>>>> ls /dev/ptmx
>>>>>>
>>>>>> I only get about as far as:
>>>>>>
>>>>>> ls /dev/p
>>>>>>
>>>>>> and then my terminal window vanishes. This happens:
>>>>>>
>>>>>> * In fish or bash.
>>>>>> * On two different hosts that I've tried.
>>>>>> * In mintty or a system terminal. In the system terminal, 
>>>>>> sometimes the
>>>>>> command works normally the first time, but fails the 2nd time; or 
>>>>>> I have to
>>>>>> press <TAB> after `ls /dev/p`, then the terminal vanishes.
>>>>>> * With other commands that treat their arguments as files, not 
>>>>>> text. So for
>>>>>> example, I can't finish typing `cat /dev/ptmx` or `test -r 
>>>>>> /dev/ptmx`
>>>>>> before the terminal window vanishes, but `echo /dev/ptmx` works 
>>>>>> normally.
>>>>>>
>>>>>> It doesn't happen:
>>>>>>
>>>>>> * In x86_64 - only i686.
>>>>>> * In scripts - only interactively.
>>>>>>
>>>>>> Is anyone else able to reproduce this? I've tried to capture an 
>>>>>> strace log,
>>>>>> but I've failed so far. The strace seems to stop the crash. Still 
>>>>>> trying.
>>>>>>
>>>>>> I thought this could be a BLODA problem, but the two hosts I 
>>>>>> tried are
>>>>>> running different virus scanners (McAfee and Windows Defender).
>>>>>>
>>>>>> Cygwin 3.1.7-1, all packages up-to-date. Output of cygcheck -svr 
>>>>>> attached.
>>>>>>
>>>>>> Andrew
>>>>>
>>>>> I think I fixed it.  I just uploaded new developer snapshots to
>>>>> https://cygwin.com/snapshots/  Please give them a try.
>>>>
>>>> When I substitute cygwin1-20090909.dll for cygwin1.dll in i686, I 
>>>> can't run
>>>> any commands. They all give "The application was unable to start 
>>>> correctly
>>>> (0xc0000022)". Anything different I should be doing?
>>>
>>> Check the permissions on cygwin1-20090909.dll.  Is it executable?
>> cygwin1-20090909.dll is 11 years old. Did you download the latest 
>> snapshot?
>
> I'm sure that was just a typo.  The 11-year-old one is not even 
> available on the snapshot page.
He could have a (very) old download sitting around somewhere and 
confused the download location. Just asked to make sure...
>   In any case, I shouldn't have mentioned that in my reply.  I should 
> have told him to check the permissions on the (new) cygwin1.dll.
>
> 0xc0000022 is the NT status code STATUS_ACCESS_DENIED, so it's likely 
> a permissions problem.
>
> Ken
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