Someone else reported on this list a similar sounding problem not so long ago.
The problem might be caused by manipulating a stale pointer to an R object
(that is an object that was discarded during R's garbage collection),
and troubleshooting this will likely mean running things through a C debugger.
You could try starting up you embedded R process with '--verbose' and see
if the problem happens right after garbage collection.
Without having further details on the exact code ran, it is difficult
to say more.
2008/7/14 laurent oget <[EMAIL PROTECTED]>:
> I am using rpy/R to perform linear regressions on a large number of
> datasets, in one python run, and am encountering segmentation faults after a
> large number of iteration, while handling cases which, taken on their own
> run without a problem. My intuition is that the previous iterations somehow
> corrupted the heap (or the stack). The code breaks in different places. One
> sample stack trace:
>
>
> *** caught segfault ***
> address 0x8, cause 'memory not mapped'
>
> Traceback:
> 1: unique.default(unlist(lapply(answer, length)))
> 2: unique(unlist(lapply(answer, length)))
> 3: sapply(xlev, is.null)
> 4: .getXlevels(mt, mf)
> 5: function (formula, data, subset, weights, na.action, method = "qr",
> model = TRUE, x = FALSE, y = FALSE, qr = TRUE, singular.ok = TRUE,
> contrasts = NULL, offset, ...) { ret.x <- x ret.y <- y cl <-
> match.call() mf <- match.call(expand.dots = FALSE) m <-
> match(c("formula", "data", "subset", "weights", "na.action",
> "offset"), names(mf), 0L) mf <- mf[c(1L, m)] mf$drop.unused.levels <-
> TRUE mf[[1L]] <- as.name("model.frame") mf <- eval(mf,
> parent.frame()) if (method == "model.frame") return(mf) else
> if (method != "qr") warning(gettextf("method = '%s' is not
> supported. Using 'qr'", method), domain = NA) mt <- attr(mf,
> "terms") y <- model.response(mf, "numeric") w <-
> as.vector(model.weights(mf)) if (!is.null(w) && !is.numeric(w))
> stop("'weights' must be a numeric vector") offset <-
> as.vector(model.offset(mf)) if (!is.null(offset)) { if
> (length(offset) == 1) offset <- rep(offset, NROW(y)) else
> if (length(offset) != NROW(y)) stop(gettextf("number of offsets
> is %d, should equal %d (number of observations)",
> length(offset), NROW(y)), domain = NA) } if (is.empty.model(mt))
> { x <- NULL z <- list(coefficients = if (is.matrix(y))
> matrix(, 0, 3) else numeric(0), residuals = y, fitted.values = 0
> * y, weights = w, rank = 0L, df.residual = if (is.matrix(y))
> nrow(y) else length(y)) if (!is.null(offset)) {
> z$fitted.values <- offset z$residuals <- y - offset }
> } else { x <- model.matrix(mt, mf, contrasts) z <- if
> (is.null(w)) lm.fit(x, y, offset = offset, singular.ok =
> singular.ok, ...) else lm.wfit(x, y, w, offset =
> offset, singular.ok = singular.ok, ...) } class(z) <- c(if
> (is.matrix(y)) "mlm", "lm") z$na.action <- attr(mf, "na.action")
> z$offset <- offset z$contrasts <- attr(x, "contrasts") z$xlevels <-
> .getXlevels(mt, mf) z$call <- cl z$terms <- mt if (model)
> z$model <- mf if (ret.x) z$x <- x if (ret.y) z$y <-
> y if (!qr) z$qr <- NULL
> z}("sls_1133745~dp_1133745+dp_3124901", list(dp_3124901 = c(0, 0, 0, 0, 0,
> -0.328504066972036, 0, 0, 0, 0, 0, 0, 0, -0.328504066972036, 0, 0, 0, 0, 0,
> -0.328504066972036, -0.328504066972036, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> -0.693147180559945, 0, -0.693147180559945, 0, 0, 0, -0.328504066972036, 0,
> 0, 0, 0, 0, 0, 0, 0, 0, -0.328504066972036, -0.328504066972036, 0, 0, 0, 0,
> 0, -0.693147180559945, 0, 0, 0, 0, -0.693147180559945, 0,
> -0.693147180559945, -0.693147180559945, 0, 0, 0, 0, 0, 0, 0,
> -0.248461359298500, 0, -0.248461359298500, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> -0.693147180559945, 0, 0, 0, -0.248461359298500, 0, 0, -0.248461359298500,
> 0, 0, -0.693147180559945, 0, 0, 0, 0, 0, 0), sls_1133745 =
> c(7.3487612610094, 7.30613534736707, 8.00046685932928, 7.39499697533915,
> 7.34321275228777, 7.88963522981753, 7.22973732372956, 8.18020882367827,
> 7.91558910409137, 7.26812538738378, 7.25818677308703, 7.3498801314529,
> 7.31767047076391, 7.65018297965786, 7.90898624450853, 8.19434808229588,
> 8.21457885218454, 7.3641669547084, 7.35953128995355, 7.7040815977251,
> 7.2031227430099, 7.31216649861154, 7.19473710631952, 7.29547045158008,
> 7.35154326140946, 7.17917838793797, 8.36984796851258, 7.1754285028756,
> 8.12093952739025, 7.687240693355, 7.2225733180656, 7.36405924490386,
> 7.3452615426351, 7.25804588634565, 7.23995411189234, 7.21269261931628,
> 7.3210695020337, 7.8386981421886, 7.373405696737, 7.17968137538913,
> 7.82070844738252, 7.43464714668485, 7.25244367037469, 7.23292820385588,
> 7.33945977029367, 7.2810277192681, 7.34753163260778, 7.94492823905035,
> 7.87310661464411, 7.14571650431343, 7.1568316491227, 8.04067559226017,
> 7.16502195742237, 7.27351582356697, 7.28802564845575, 8.77370188389706,
> 7.3224047480958, 6.4802899305943, 7.2810277192681, 7.26784638120198,
> 7.35638204246829, 7.20306320059336, 7.15358357480953, 8.01940553608164,
> 8.78195611526034, 7.24723014605046, 7.319056656224, 7.24884540813453,
> 7.25487774291456, 7.211054762329, 8.21131456124779, 7.19920773459773,
> 7.9786879985435, 7.28814186671376, 7.27840117311202, 7.2972806890663,
> 8.14356390282749, 7.34424090367824, 7.32067255061534, 7.34136070803461,
> 7.76719625525884, 7.20539015753155, 7.19294925869672, 8.12521670148863,
> 7.3678032648606, 7.32193563210652, 7.16022459567817, 7.34345210203388,
> 8.11895788519276, 7.81886461055585, 7.76421532379024, 7.93634917049156,
> 7.20526391225165, 7.2842720651344, 7.28607526956675, 7.29555188093676,
> 7.19784694602772, 7.18371895847972, 7.21964936074816, 7.87895077602558,
> 7.26955407354936), dp_1133745 = c(-0.223143551314210, 0, -0.287682072451781,
> 0, 0, -0.116533816255952, 0, -0.223143551314210, -0.116533816255952, 0, 0,
> 0, 0, -0.116533816255952, -0.116533816255952, -0.223143551314210,
> -0.287682072451781, 0, 0, -0.116533816255952, 0, 0, 0, 0, 0, 0,
> -0.287682072451781, 0, -0.287682072451781, -0.116533816255952, 0, 0, 0, 0,
> 0, 0, 0, -0.116533816255952, 0, 0, -0.248461359298500, 0, 0, 0, 0, 0, 0,
> -0.116533816255952, -0.116533816255952, 0, 0, -0.287682072451781, 0, 0, 0,
> -0.400477566597125, 0, 0, 0, 0, 0, 0, 0, -0.248461359298500,
> -0.400477566597125, 0, 0, 0, 0, 0, -0.287682072451781, 0,
> -0.287682072451781, 0, 0, 0, -0.223143551314210, 0, 0, 0,
> -0.116533816255952, 0, 0, -0.223143551314210, 0, 0, 0, 0,
> -0.287682072451781, -0.248461359298500, -0.116533816255952,
> -0.287682072451781, 0, 0, 0, 0, 0, 0, 0, -0.116533816255952, 0)))
>
>
> would anybody have a hint on how to troubleshoot this?
>
> Thanks,
>
> Laurent
>
>
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