Re: [Plplot-general] Segfault

[Werner S. <sm...@ia...>]

Hi Torquil,

same problem for me here - I'll have a look into this.

Thanks,
Werner

On 01.02.2008, at 15:28, Torquil Macdonald S=F8rensen wrote:

> Hello, just disregard this if it is the same as the other thread =20
> with a
> segfault and if it does not provide any more information.
>
> I get a segfault I get when running the C-example no.1 with the "-=20
> save"
> option:
>
> x01c -dev xwin -np -save 1.psc
>
> If I comment out plend() in the example, it works fine. I'm using =20
> todays SVN
> version, built with debugging symbols. The examples are also built =20
> with
> debugging, but gdb gives me no output more than:
>
> Program received signal SIGSEGV, Segmentation fault.
> 0xb7cdd33c in free () from /lib/i686/cmov/libc.so.6
>
> Valgrind gives lots of output, but it is the last one that seems most
> interesting:
>
> =3D=3D32061=3D=3D Invalid free() / delete / delete[]
> =3D=3D32061=3D=3D    at 0x402465C: free (vg_replace_malloc.c:323)
> =3D=3D32061=3D=3D    by 0x40417EF: c_plend1 (plcore.c:1823)
> =3D=3D32061=3D=3D    by 0x40411FB: c_plend (plcore.c:1759)
> =3D=3D32061=3D=3D    by 0x804904D: main (x01c.c:210)
> =3D=3D32061=3D=3D  Address 0x430d4f8 is 0 bytes inside a block of size =
=20
> 131,072 free'd
> =3D=3D32061=3D=3D    at 0x402465C: free (vg_replace_malloc.c:323)
> =3D=3D32061=3D=3D    by 0x40417EF: c_plend1 (plcore.c:1823)
> =3D=3D32061=3D=3D    by 0x8048F3B: main (x01c.c:184)
>
> There seems to be some problem with freeing memory. It looks like =20
> the error
> message in sec.4.3.4 in the valgrind manual, here:
>
> http://valgrind.org/docs/manual/mc-manual.html#mc-manual.errormsgs
>
>> =46rom what I can understand (which may be wrong) it is related to =20=

>> freeing the
> memory for plsc->plbuf_buffer, but after looking through the code I =20=

> think it
> will be too complicated for me to track down the error.
>
> Best regards,
> Torquil S=F8rensen
>
> =
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--
Dr. Werner Smekal
Institut fuer Allgemeine Physik
Technische Universitaet Wien
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Austria

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