[Rd] R on Windows crashes when using certain characters in strings in data frames (PR#14125)

From: <karl_at_huftis.org>
Date: Thu, 10 Dec 2009 10:20:09 +0100 (CET)


Full_Name: Karl Ove Hufthammer
Version: 2.10.0
OS: Windows XP
Submission from: (NULL) (93.124.134.66)

I have found a rather strange bug in R 2.10.0 on Windows, where the choice of characters used in a string make R crash (i.e., Windows shows a dialogue saying that the application has a problem, and must be closed).

I can reproduce the bug on two separate systems running Windows XP, and with both R 2.10.0 and the latest R.2.10.1 RC.

The following commands trigger the crash for me:

n=1e5
k=10
x=sample(k,n,replace=TRUE)
y=sample(k,n,replace=TRUE)

xy=paste(x,y,sep=" ")
z=sample(n)
d=data.frame(xy,z)

The last step takes very long time, and R crashes before it's finished. Note that if I reduce n, the problem disappears. Also, if I change the (a multiplication symbol) to a x (a letter), the problem also disappears (and the last command takes almost no time to run).

I originally discovered this (or a related?) bug while using 'unique' on a data frame similar to the 'd' data frame defined above, where R would often, but not always, crash.

> sessionInfo()
R version 2.10.0 (2009-10-26)
i386-pc-mingw32

locale:
[1] LC_COLLATE=Norwegian-Nynorsk_Norway.1252
[2] LC_CTYPE=Norwegian-Nynorsk_Norway.1252
[3] LC_MONETARY=Norwegian-Nynorsk_Norway.1252
[4] LC_NUMERIC=C
[5] LC_TIME=Norwegian-Nynorsk_Norway.1252

attached base packages:
[1] stats graphics grDevices utils datasets methods base



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