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fread on particular file crashes R #2167

HughParsonage opened this issue May 17, 2017 · 1 comment

fread on particular file crashes R #2167

HughParsonage opened this issue May 17, 2017 · 1 comment


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@HughParsonage HughParsonage commented May 17, 2017

I have a particular file which when passed to the current fread crashes R. Not reproducible on CRAN 1.10.4 but reproducible on the version at 6019cfb . Very similar files do not have this problem.

The file is a csv (renamed to .txt to upload).


fread('10237-rsession-aborted.txt', verbose = TRUE)

Input contains no \n. Taking this to be a filename to open
NAstrings = [<<NA>>]
None of the NAstrings are numeric (such as '-9999').
`filename` argument given, attempting to open a file with such name
File opened, size 0.000003 GB.
Memory mapping ... ok
Detected eol as \r\n (CRLF) in that order, the Windows standard.
Positioned on line 1 starting: <<row_n,lat,lon,id,place_id,refe>>
Detecting sep ...
  sep==','(ascii 44)  with 9 lines of 8 fields using quote rule 0
Detected 8 columns on line 1. This line is either column names or first data row (first 30 chars): <<row_n,lat,lon,id,place_id,refe>>
All the fields on line 1 are character fields. Treating as the column names.
Number of sampling jump points = 1 because 2757 bytes from row 1 to eof / (2 * 2757 jump0size) == 0


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@MichaelChirico MichaelChirico commented Jun 3, 2017

Confirming a segfault on current dev: "built 2017-06-03 02:37:39 UTC; travis"

Can add that this works:

fread('head -n 1 ~/Downloads/10237-ression-aborted.txt')
# Empty data.table (0 rows) of 8 cols: row_n,lat,lon,id,place_id,reference...

But even with 2 rows same issue:

fread('head -n 2 ~/Downloads/10237-ression-aborted.txt')

#  *** caught segfault ***
# address 0x7fe98f43fa70, cause 'memory not mapped'

@mattdowle mattdowle added this to the v1.10.6 milestone Jun 7, 2017
mattdowle added a commit that referenced this issue Jun 7, 2017
Fix OOB array access to pow10lookup. Closes #2167
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