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Re: heap_free fatal error [message #61845]

Fri, 08 August 2008 04:14

Wox
Messages: 184
Registered: August 2006

Senior Member

Thanks guys. I reported the problem to ITTVIS.

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Re: heap_free fatal error [message #61855 is a reply to message #61845]

Thu, 07 August 2008 09:04

Jean H.
Messages: 472
Registered: July 2006

Senior Member

> Add
> x86 Win32 Windows Microsoft Windows 6.4 Mar 23 2007 32 64
>
> to the list of versions with this bug.
> So far it looks like it's only Windows systems affected...

as well as
IDL> print, !version
{ x86 Win32 Windows Microsoft Windows 6.3 Mar 23 2006 32 64}

Jean

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Re: heap_free fatal error [message #61858 is a reply to message #61855]

Thu, 07 August 2008 08:11

Bob[3]
Messages: 60
Registered: December 2006

Member

On Aug 7, 10:30 am, Wox <nom...@hotmail.com> wrote:
>> Did anyone observed heap_free crashing the IDL process and what was
>> the cause in your case?
>
> I managed to extract the critical code:
>
> n=30000l
> p0=ptr_new({i:0l,next:ptr_new()})
> p=p0
> for i=1l,n do begin
> (*p).next=ptr_new({i:i,next:ptr_new()})
> p=(*p).next
> endfor
> heap_free,p0 ; FATAL ERROR
>
> Is this a known bug?

Add
x86 Win32 Windows Microsoft Windows 6.4 Mar 23 2007 32 64

to the list of versions with this bug.
So far it looks like it's only Windows systems affected...

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Re: heap_free fatal error [message #61859 is a reply to message #61858]

Thu, 07 August 2008 08:03

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

Seg faulted on Mac:

IDL> print, !version
{ i386 darwin unix Mac OS X 7.0 Oct 25 2007 32 64}

But runs OK on Linux:

IDL> print, !version
{ x86 linux unix linux 7.0 Oct 25 2007 32 64}

Mike
--
www.michaelgalloy.com
Tech-X Corporation
Software Developer II

Wox wrote:
>> Did anyone observed heap_free crashing the IDL process and what was
>> the cause in your case?
>
> I managed to extract the critical code:
>
> n=30000l
> p0=ptr_new({i:0l,next:ptr_new()})
> p=p0
> for i=1l,n do begin
> (*p).next=ptr_new({i:i,next:ptr_new()})
> p=(*p).next
> endfor
> heap_free,p0 ; FATAL ERROR
>
>
> Is this a known bug?

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Re: heap_free fatal error [message #61860 is a reply to message #61859]

Thu, 07 August 2008 07:38

Wox
Messages: 184
Registered: August 2006

Senior Member

On Thu, 07 Aug 2008 16:30:32 +0200, Wox <nomail@hotmail.com> wrote:

>> Did anyone observed heap_free crashing the IDL process and what was
>> the cause in your case?
>
> I managed to extract the critical code:
>
> n=30000l
> p0=ptr_new({i:0l,next:ptr_new()})
> p=p0
> for i=1l,n do begin
> (*p).next=ptr_new({i:i,next:ptr_new()})
> p=(*p).next
> endfor
> heap_free,p0 ; FATAL ERROR
>
>
> Is this a known bug?

I tried with IDL 6.2 on a Linux machine: no Fatal error
{ x86 linux unix linux 6.2 Jun 20 2005 32 64}

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Re: heap_free fatal error [message #61861 is a reply to message #61860]

Thu, 07 August 2008 07:34

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Wox writes:

> I managed to extract the critical code:
>
> n=30000l
> p0=ptr_new({i:0l,next:ptr_new()})
> p=p0
> for i=1l,n do begin
> (*p).next=ptr_new({i:i,next:ptr_new()})
> p=(*p).next
> endfor
> heap_free,p0 ; FATAL ERROR
>
>
> Is this a known bug?

Now it is. :-)

It sure does ruin my day, IDL 7.0.1 on Windows 32-bit.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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Re: heap_free fatal error [message #61862 is a reply to message #61861]

Thu, 07 August 2008 07:30

Wox
Messages: 184
Registered: August 2006

Senior Member

> Did anyone observed heap_free crashing the IDL process and what was
> the cause in your case?

I managed to extract the critical code:

n=30000l
p0=ptr_new({i:0l,next:ptr_new()})
p=p0
for i=1l,n do begin
(*p).next=ptr_new({i:i,next:ptr_new()})
p=(*p).next
endfor
heap_free,p0 ; FATAL ERROR

Is this a known bug?

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Re: heap_free fatal error [message #62137 is a reply to message #61845]

Tue, 26 August 2008 15:26

lambda.knight
Messages: 1
Registered: August 2008

Junior Member

Hey, guys,

This problem is due to a stack overflow in the code that cleans up the
heap. I submitted a fix and it should show up in a future version. A
quick band-aid until then is to increase the stack size for IDL. On
*nix systems, that's usually done with the "ulimit" command. On
Windows, I think you can do it with "editbin.exe". Here's a webpage
that has a little bit more detail on how to increase the stack size:
http://www.cs.nyu.edu/exact/core/doc/stackOverflow.txt

Unfortunately, this work around isn't a complete fix. You can still
run into this problem, but it will take a much larger object to hit
it. On OS X, setting the stack size to the maximum let me run the
OP's code with n=149000l.

Mark Eret
ITT Visual Information Solutions

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