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 <ruipbarradas at sapo.pt>
To: Chris Triggs <cm.triggs at auckland.ac.nz>; "r-devel at
r-project.org" <r-devel at r-project.org>
Cc: Thomas Lumley <t.lumley at 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
>
>
> ??? [[alternative HTML version deleted]]
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
______________________________________________
R-devel at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
[[alternative HTML version deleted]]
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 <ruipbarradas at sapo.pt>
> To: Chris Triggs <cm.triggs at auckland.ac.nz>; "r-devel at
r-project.org" <r-devel at r-project.org>
> Cc: Thomas Lumley <t.lumley at 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
>>
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-devel at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
The issue seems related to R bug report 15012:
https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=15012
As mentioned in the comments there, a pull request to the TRE library has
recently been made, but I don't know about its status.
Daniel
________________________________________
Von: R-devel <r-devel-bounces at r-project.org> im Auftrag von Tomas
Kalibera <tomas.kalibera at gmail.com>
Gesendet: Donnerstag, 17. August 2017 10:14
An: r-devel at r-project.org
Betreff: Re: [Rd] Problem with a regular expression.
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 <ruipbarradas at sapo.pt>
> To: Chris Triggs <cm.triggs at auckland.ac.nz>; "r-devel at
r-project.org" <r-devel at r-project.org>
> Cc: Thomas Lumley <t.lumley at 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
>>
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-devel at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
______________________________________________
R-devel at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel