The problem is in TRE library, in regcomp, while compiling the regular
expression.
This is enough to trigger in R (to do this without re-boot: ulimit -v
500000 ):
> strsplit("", "\\\\)")
To repeat in TRE, one can build TRE from sources and run
> ./src/agrep "\\\\)" README.md
Tomas
On 08/17/2017 09:45 AM, Moshe Olshansky via R-devel wrote:
I tried this on a Linux (Ubuntu) server invoking R from the command line and
the result was the same, except that I could kill the R session from another
terminal window.
From: Rui Barradas <ruipbarra...@sapo.pt>
To: Chris Triggs <cm.tri...@auckland.ac.nz>; "r-devel@r-project.org"
<r-devel@r-project.org>
Cc: Thomas Lumley <t.lum...@auckland.ac.nz>
Sent: Thursday, 17 August 2017, 17:26
Subject: Re: [Rd] Problem with a regular expression.
Hello,
This seems to be serious.
RGui.exe, fresh session. I've clicked File > New Script and wrote
Oldterm <- c("A", "B", "A", "*", "B")
strsplit(Oldterm, "\\\\)" )
Ran each instruction at a time with Ctrl+r and with the strsplit call
the system froze.
Ctrl+Alt+Del didn't work, I had to go for the power switch button.
sessionInfo()
R version 3.4.1 (2017-06-30)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
Matrix products: default
locale:
[1] LC_COLLATE=Portuguese_Portugal.1252
LC_CTYPE=Portuguese_Portugal.1252
[3] LC_MONETARY=Portuguese_Portugal.1252 LC_NUMERIC=C
[5] LC_TIME=Portuguese_Portugal.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_3.4.1
Rui Barradas
Em 16-08-2017 23:31, Chris Triggs escreveu:
Hi...
I have come upon a problem with a regular expression which causes base-R to
freeze. I have reproduced the phenomenon on several machines running R under
Windows 10, and also under OSX on different Apple MACs.
The minimal example is:-
Oldterm is a vector of characters, e.g. "A", "B", "A", "*", "B"
The regular expression is "\\\\)"
The call which freezes R is
strsplit(Oldterm, "\\\\)" )
Thomas - after he had reproduced the problem - suggested that I submit it to
r-devel.
Best wishes....
Chris Triggs
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