[Rd] Intermittent crashes with inset `[<-` command

[Rui Barradas]

Hello,

I can also reproduce this, R 3.5.2 on Ubuntu 18.04 LTS.


First run gives error after 148.

After 148:

Error in `[<-`(x, y == "a", x[y == "b"]) :
   substituto tem comprimento zero
Execução interrompida

Translation:

replacement has length zero
Execution stopped


Second run gives a different error, I changed the script to start with a 
sessionInfo() instruction, everything else is the same as in the OP.

After 180:

  *** caught segfault ***
address 0x700000002, cause 'memory not mapped'
An irrecoverable exception occurred. R is aborting now ...


Several runs with or without the sessionInfo() always give the two 
different errors above.

The sessionInfo() was the following.

sessionInfo()
R version 3.5.2 (2018-12-20)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 18.04.1 LTS

Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.7.1
LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.7.1

locale:
  [1] LC_CTYPE=pt_PT.UTF-8       LC_NUMERIC=C
  [3] LC_TIME=pt_PT.UTF-8        LC_COLLATE=pt_PT.UTF-8
  [5] LC_MONETARY=pt_PT.UTF-8    LC_MESSAGES=pt_PT.UTF-8
  [7] LC_PAPER=pt_PT.UTF-8       LC_NAME=C
  [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=pt_PT.UTF-8 LC_IDENTIFICATION=C

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

loaded via a namespace (and not attached):
[1] compiler_3.5.2


Hope this helps,

Rui Barradas


Às 08:46 de 27/02/2019, Serguei Sokol escreveu:
> On 26/02/2019 05:18, Brian Montgomery via R-devel wrote:
>> The following code crashes after about 300 iterations on 
>> my x86_64-w64-mingw32 machine on R 3.5.2 --vanilla.
>> Others have duplicated this 
>> (see https://github.com/tidyverse/magrittr/issues/190 if necessary), 
>> but I don't know how machine/OS-dependent it may be.
> It crashes too on my Mageia6 (RPM based Linux distribution):
>   184 185 186 187
>   *** caught segfault ***
> address 0x700000002, cause 'memory not mapped'
> 
> Possible actions:
> 1: abort (with core dump, if enabled)
> 2: normal R exit
> 3: exit R without saving workspace
> 4: exit R saving workspace
> 
> The crash can happen at different moments, sometimes after i=187 like in 
> the example above, sometimes after i=915. The error is not always 
> segfault. It can also be
> 
> 915 Error in `[<-`(x, y == "a", x[y == "b"]) : replacement has length zero
> 
> or
> 
> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Error in 
> `[<-`(x, y == "a", x[y == "b"]) :
>    types (de raw a integer) incompatibles dans l'ajustement 
> d'affectation de type
> 
> (sorry, this crash was in french locale)
> 
> Hoping this helps.
> Serguei.
> 
>  >  sessionInfo()
> R version 3.5.2 (2018-12-20)
> Platform: x86_64-pc-linux-gnu (64-bit)
> Running under: Mageia 6
> 
> Matrix products: default
> BLAS/LAPACK: /home/opt/OpenBLAS/lib/libopenblas_sandybridge-r0.3.3.so
> 
> locale:
> [1] C
> 
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods base
> 
> loaded via a namespace (and not attached):
> [1] compiler_3.5.2
> 
>> If it doesn't crash for you, please try increasing the length of the x 
>> vector.
>>
>> Substituting the commented-out line for the one below it works 
>> correctly (prints out 1:1000 and ends normally) every time.
>>
>> x <- 1:200000
>> y <- rep(letters[1:5], length(x) / 5L)
>> for (i in 1:1000) {
>>    # x[y == 'a'] <- x[y == 'b']
>>    x <- `[<-`(x, y == 'a', x[y == 'b'])
>>    cat(i, '')
>> }
>> cat('\n')
>>
>> The point of using this syntax is to make it work better with pipes, 
>> but the errors occur without pipes or magrittr.
>>
>> Thank you for your help!
>>
>> ______________________________________________
>> R-devel using r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
> 
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