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From:	Heiko Elger <heiko_elger AT arburg DOT com>
Subject:	Re: [bash or DLL] Memory leak in childs
Date:	Tue, 19 Jul 2011 09:23:12 +0000 (UTC)
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Mark Geisert writes:

> Please don't quote raw email addresses; not quoting these is a list convention.

I'm sorry ...

> > shell script:
> > ******* snip snip snip ****
> > 1 [main] bash 4800 fork: child -1 - CreateProcessW failed for
> > 'c:\programme\cygwin\bin\bash.exe', errno 12
> > ./test2.sh: fork: Cannot allocate memory
> > ******* snip snip snip ****
> 
> Are you saying you continue to see virtual memory use increasing over time and
> eventually the above output is seen?  It's hard to tell because what's quoted
> above doesn't match your earlier report.  Is test2.sh the script you used for
> the second example in your first post on this subject?

Again I'm sorry - I just used another small testcase doing the same.
See start/test description at the end of the message.

****** snip snip snip ******
$ cat test2.sh
#!/bin/sh
trap "echo TRAP; exit -1" SIGHUP SIGINT SIGQUIT SIGILL SIGTRAP SIGABRT SIGEMT SI
GFPE SIGKILL SIGBUS SIGSEGV SIGSYS SIGPIPE SIGALRM SIGTERM SIGURG SIGSTOP SIGTST
P SIGCONT SIGCHLD SIGTTIN SIGTTOU SIGIO SIGXCPU SIGXFSZ SIGVTALRM SIGPROF SIGWIN
CH SIGPWR SIGUSR1 SIGUSR2 SIGRTMAX

while ./exiter-vs2003.exe ; do
    echo -n $?
done
echo RC=$?
****** snip snip snip ******

exiter-vs2003.c.c ist compiled with MS Visual Studio 2003
****** snip snip snip ******
$ cat exiter-vs2003.c
#include <stdio.h>

int main(int argc, char** argv[])
{
    printf(".");
    return 0;
}
****** snip snip snip ******

> However, I understand that Windows 7 has an anti-spyware service named Windows
> Defender included and enabled by default.  Is it enabled on your system?  If it
Thanks a lot - indeed MS defender was active - I deactivate it!


Here is my description of the testcase.

Step 1) Open one bash console for calling "/usr/bin/free" from time to time
to see the "lost memory" while running step 2.

$ free
             total       used       free     shared    buffers     cached
Mem:      12540232    1862512   10677720          0          0          0
-/+ buffers/cache:    1862512   10677720
Swap:     12540232          0   12540232

Wait 10 seconds ...
             total       used       free     shared    buffers     cached
Mem:      12540232    1862512   10677720          0          0          0
-/+ buffers/cache:    1862512   10677720
Swap:     12540232          0   12540232

Again wait 10 seconds ...
$ free
             total       used       free     shared    buffers     cached
Mem:      12540232    1863620   10676612          0          0          0
-/+ buffers/cache:    1863620   10676612
Swap:     12540232          0   12540232

Again wait 10 seconds ...
$ free
             total       used       free     shared    buffers     cached
Mem:      12540232    1873316   10666916          0          0          0
-/+ buffers/cache:    1873316   10666916
Swap:     12540232          0   12540232

Again wait 10 seconds ...
$ free
             total       used       free     shared    buffers     cached
Mem:      12540232    1875340   10664892          0          0          0
-/+ buffers/cache:    1875340   10664892
Swap:     12540232          0   12540232


Step 2) Open another or more bash console for calling "test2.sh"
$ ./test2.sh
you will see lots of lines like this
******** snip snip snip ***********
.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0
******** snip snip snip ***********

If running more "test2.sh" in parallel (I use up to 10) the memory consumption
is even more.

As you see - on my system memory is lost ...
I just see that between two free calls or in Windows Task Manager - of course
other programm need memory too - but the memory always shrinks.


best regards

Heiko


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