Message-ID: <Pine.LNX.4.64.0702211331250.10793@auk.stats>
Date: 2007-02-21T13:32:10Z
From: Brian Ripley
Subject: R unstable and crashes after executing .C
In-Reply-To: <5FF3F11444E3A9439191AA1EDCB69A17B86201@icosrvmail01.ICO.SCS.local>
Please do as I suggested in my reply to your message to R-help!
And do read the posting guide and not send HMTL mail.
On Wed, 21 Feb 2007, Sole Acha, Xavi wrote:
> Dear R listers,
>
>
>
> I have developed a C function to be executed from R through the ".C" interface. After doing dyn.load, the function executes properly and I get the results. However, after executing my function, R seems to get unstable and crashes (giving a segmentation fault and exiting) whenever I try to do ANYTHING with a relatively large object (creating a new one or even just writing the name of an existing one).
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> I use R 2.4.0 under a Linux machine with 1 GB RAM. Below there is an example of execution, so you can get an idea of what is happening:
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> --------------------
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> dyn.load("my_C_module.so");
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> res <- .C("my_C_function",.....); #The function executes fine and res is ok
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> dyn.unload("my_C_module.so") #I know this isn't strictly necessary
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>
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> #Here R is still running, but when I execute:
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> m <- matrix(0,1000,100); #I try to create a new object and R crashes
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> *** caught segfault ***
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> address 0x10, cause 'memory not mapped'
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> Traceback:
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> 1: matrix(0, 1000, 100)
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> Possible actions:
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> 1: abort (with core dump)
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> 2: normal R exit
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> 3: exit R without saving workspace
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> 4: exit R saving workspace
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> --------------------
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> Although I tell R to abort and give me the core dump, it doesn't succeed in doing so.
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> I would be grateful if anyone could tell me what could be the problem with my C function that makes R behave this way?
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> Thank you very much in advance, and apologies for this long email.
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> Xavier Sol?.
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> [[alternative HTML version deleted]]
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--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595