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Date: Mon, 29 Nov 2010 21:57:08 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: tcsh out of memory and core dump
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On Nov 29 05:58, tsteven4 wrote:
> I can readily reproduce a tcsh error "Out of memory", however the
> timing is variable.  In my actual application the time to failure
> varies from seconds to hours.  I have a test case that seems to be
> able to reproduce the error.
> 
> The symptom of the error is a message like:
> 188
> ./test2
> 189
> ./test2
> 190
> ./test2
> 191
> tcsh current memory allocation:
> free:       0  119   52   25   29   23   17    3    0    2    0    0
> 2    0    0    0    0    0    0    0    0    0    0    0    0    0
> 0    0    0
> used:       0    9  204  167   51   33   19    3    1    1    2    2
> 1    4    3    0    0    0    0    0    0    0    0    0    0    0
> 0    0    0
>         Total in use: 788560, total free: 100272
>         Allocated memory from 0xab0000 to 0xffffffff.  Real top at 0xb89000
> nbytes=32784: Out of memory
> Abort (core dumped)
> 192
> ./test2
> 193
> ./test2
> 194
> ./test2
> 195
> ./test2

Thanks for the testcase!  It helped me to track down a memory leak in
Cygwin which occurs on each dup/dup2/dup3 call on a tty.  This is done
very often in tcsh and thus affects long-running scripts quite heavily.

I applied a patch to CVS.  Please test the next Cygwin developer snapshot
from http://cygwin.com/snapshots/, which will contain the fix.


Thanks again,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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