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Date: Mon, 23 Dec 2013 15:25:18 -0500
From: Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Fwd: infocmp.exe opens in a new windows-cmd window and hangs
Message-ID: <20131223202518.GA8030@ednor.casa.cgf.cx>
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User-Agent: Mutt/1.5.20 (2009-06-14)

On Mon, Dec 23, 2013 at 08:09:46PM +0100, Irfan Adilovic wrote:
>On Mon, Dec 23, 2013 at 5:06 PM, Larry Hall (Cygwin) wrote:
>> On 12/22/2013 9:09 PM, Irfan Adilovic wrote:
>>>
>>> On my 64-bit Cygwin installation, when I start `infocmp.exe` from
>>> within mintty, it opens up a new cmd-window (not mintty!), shows
>>> options and immediately closes. However, the infocmp process hangs in
>>> a way that defies killing -- it cannot be killed even from the windows
>>> task manager (first attempt at killing has no effect, later attempts
>>> return "Access is denied"). Same thing for its parent process, sh.exe.
>>> So far, I haven't found a way of killing these two processes short of
>>> restarting the system.
>>>
>>> A workaround is to either uninstall ncurses or to move away
>>> infocmp.exe -- with luck, stuff will work (for example, `perl -de0`
>>> hangs because of infocmp, but works flawlessly with infocmp moved
>>> away).
>>>
>>> Now, has anyone else observed this, or am I the only one? I've tried
>>> reinstalling ncurses without effect, any other suggestions?
>>>
>>> I'm running 64-bit Cygwin under Windows 8.
>>
>>
>> No problem for me on Windows 7, 32-bit.  If you're still having trouble,
>> please read and follow the problem reporting guidelines found at the link
>> below with any follow-up mail to the list.  That will help others on the
>> list do some basic evaluation of your issue.
>>
>>> Problem reports:       http://cygwin.com/problems.html
>
>I'm running cygwin 64-bit, version 1.7.27(0.271/5/3), under Windows 8
>Professional. When I run infocmp.exe (without arguments) from the
>ncurses package, from within a mintty terminal, it opens up a new
>cmd.exe window, prints whatever it is supposed to print when called
>without arguments and then exits, closing the cmd.exe window. Invoking
>with '>/dev/null 2>/dev/null' behaves exactly the same as without.
>
>I was able to capture the cmd.exe window (which is closed
>instantaneously) with a screen recording software and then extract the
>frame, see here: http://s21.postimg.org/jwz9s8dlz/infocmp_normal.jpg .
>I have also observed a stacktrace in that cmd.exe window once, but
>couldn't figure out what causes it (a different executable filename is
>not the cause, and it happened only once out of about 6 times I
>recorded the screen):
>http://s18.postimg.org/a7pzrbuih/infocmp_stacktrace.jpg
>
>Now, even after the cmd.exe window is closed, infocmp.exe remains
>running in the mintty terminal and cannot be killed. After pressing
>Ctrl-C, the following output is always shown after a variable amount
>of time (in a couple of tests, I got values between 20 and 50
>seconds):
>
>irfan AT irfy:/usr/bin$ ./infocmp.exe
>      1 [sig] -bash 16792 get_proc_lock: Couldn't acquire
>sync_proc_subproc for(5,1), last 7, Win32 error 0
>    497 [sig] -bash 16792 proc_subproc: couldn't get proc lock. what 5, val 1
>
>The first number on the second line of output corresponds to the
>amount of time waited in 1/10ths of a second.
>
>Looking at the task manager reveals an sh.exe parent and an
>infocmp.exe child, neither of which can be killed: "Access is denied".
>I have to reboot to get rid of them.
>
>I stumbled across this problem by trying to run the perl debugger --
>`perl -de0` -- which hangs as just described. Uninstalling the ncurses
>package makes the perl debugger work -- as does moving away (renaming)
>just the infocmp executable. Reinstalling the ncurses package does not
>resolve the problem.
>
>I've attached my cygcheck.out (removed a couple of env-vars -- they do
>not influence PATH-like variables anyway). You will notice that
>cygcheck says that infocmp.exe is missing -- that's because I had it
>moved away (renamed it) for `perl -de0` to work at the time of running
>cygcheck.
>
>I don't think it should make a difference, but someone on
>stackoverflow thought that mintty terminal options could cause the
>problem -- I have changed some colors and fonts, changed mouse
>behavior to mimic PuTTY, but I left the terminal type at 'xterm' and
>answerback empty.
>
>I have also tried to start the infocmp.exe directly from the common
>cmd.exe shell -- it always ended up in a stack trace. (This could be
>normal I guess)

I just tried running infocmp from both mintty and cmd on Windows 8.1
64-bit.  The behavior is as expected.  No terminal window, no stack
trace.  I'm surprised that "perl -de 0" causes infocmp to be run but
that works fine too.

If you haven't upgraded to Windows 8.1, maybe that will fix the problem.
Otherwise, I suspect BLODA.

http://cygwin.com/acronyms/#BLODA

cgf

cgf

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