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Re: [igraph] IGRAPH_FINALLY_REAL error in python binding

From: Gábor Csárdi
Subject: Re: [igraph] IGRAPH_FINALLY_REAL error in python binding
Date: Wed, 11 Dec 2013 09:26:45 -0500

Hi, this should not happen and it might be an internal error in igraph.

First, I would check that the version of the C library and the Python
package matches, because that might cause funny things if it does not.

Otherwise, can you please tell us you igraph version and platform
information (OS, OS version, igraph C library version) and send some
_complete_ code that reproduces this? Thanks.

You can send it to the list, or (better) report a bug for it at



On Wed, Dec 11, 2013 at 5:15 AM, Yaohua Xiong <address@hidden> wrote:
> Hi,
> I'm relative new to the igraph lib and encounters a weird problem. The
> problem is boiled down like this:
> given following code snippet
> """
> # initialize a graph with postive attribute "imp_tt"
> for i in range(1000):
>     sp = graph.shortest_paths(sidx, tidx, weights="imp_tt")[0][0]
> """
> for a small graph of 1000+ vertices, this code snippet works perfectly.
> But for a bigger graph of 10000+ vertices the code crash with
> """
> python: igraph_error.c:173: IGRAPH_FINALLY_REAL: Assertion `no<100' failed.
> Aborted
> """
> after about 100 iterations.
> However if I delete the weights="imp_tt" part it works again.
> I searched the archive and get a sense that it involves a stack not get
> released. But then why it doesn't need to be explicitly released for the
> small graph?
> Any Ideas what's going wrong?
> Best Regards,
> Yaohua Xiong
> --
> M.Sc. Engg Yaohua Xiong
> Universität Stuttgart
> Lehrstuhl für Verkehrsplanung und Verkehrsleittechnik
> _______________________________________________
> igraph-help mailing list
> address@hidden
> https://lists.nongnu.org/mailman/listinfo/igraph-help

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