"There was an error displaying this diff"

[Illya Broder]

HI.

I'm getting this error along with "filedescriptor out of range in select()"

If I click on the "details" option it displays the following 

How do I solve this.

Regards,
Illya

raceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/ReviewBoard-2.5.6.1-py2.6.egg/reviewboard/reviews/views.py", line 179, in build_diff_comment_fragments
    comment.interfilediff)
  File "/usr/lib/python2.6/site-packages/ReviewBoard-2.5.6.1-py2.6.egg/reviewboard/diffviewer/diffutils.py", line 497, in get_last_line_number_in_diff
    f = get_file_from_filediff(context, filediff, interfilediff)
  File "/usr/lib/python2.6/site-packages/ReviewBoard-2.5.6.1-py2.6.egg/reviewboard/diffviewer/diffutils.py", line 481, in get_file_from_filediff
    request=request)
  File "/usr/lib/python2.6/site-packages/ReviewBoard-2.5.6.1-py2.6.egg/reviewboard/diffviewer/diffutils.py", line 429, in populate_diff_chunks
    chunks = list(generator.get_chunks())
  File "/usr/lib/python2.6/site-packages/ReviewBoard-2.5.6.1-py2.6.egg/reviewboard/diffviewer/chunk_generator.py", line 756, in get_chunks
    for chunk in super(DiffChunkGenerator, self).get_chunks(cache_key):
  File "/usr/lib/python2.6/site-packages/ReviewBoard-2.5.6.1-py2.6.egg/reviewboard/diffviewer/chunk_generator.py", line 107, in get_chunks
    large_data=True)
  File "/usr/lib/python2.6/site-packages/Djblets-0.9.3-py2.6.egg/djblets/cache/backend.py", line 295, in cache_memoize
    compress_large_data))
  File "/usr/lib/python2.6/site-packages/Djblets-0.9.3-py2.6.egg/djblets/cache/backend.py", line 249, in cache_memoize_iter
    items = items_or_callable()
  File "/usr/lib/python2.6/site-packages/Djblets-0.9.3-py2.6.egg/djblets/cache/backend.py", line 292, in <lambda>
    lambda: [lookup_callable()],
  File "/usr/lib/python2.6/site-packages/ReviewBoard-2.5.6.1-py2.6.egg/reviewboard/diffviewer/chunk_generator.py", line 106, in <lambda>
    lambda: list(self.get_chunks_uncached()),
  File "/usr/lib/python2.6/site-packages/ReviewBoard-2.5.6.1-py2.6.egg/reviewboard/diffviewer/chunk_generator.py", line 763, in get_chunks_uncached
    new = get_patched_file(old, self.filediff, self.request)
  File "/usr/lib/python2.6/site-packages/ReviewBoard-2.5.6.1-py2.6.egg/reviewboard/diffviewer/diffutils.py", line 232, in get_patched_file
    return patch(diff, buffer, filediff.dest_file, request)
  File "/usr/lib/python2.6/site-packages/ReviewBoard-2.5.6.1-py2.6.egg/reviewboard/diffviewer/diffutils.py", line 147, in patch
    stdout, stderr = p.communicate(diff)
  File "/usr/lib64/python2.6/subprocess.py", line 691, in communicate
    return self._communicate(input)
  File "/usr/lib64/python2.6/subprocess.py", line 1211, in _communicate
    rlist, wlist, xlist = select.select(read_set, write_set, [])
ValueError: filedescriptor out of range in select(

[Christian Hammond]

Hi Illya,

Hmm, that's an interesting one. This is coming from within Python itself, and I've never seen it before. It almost seems like it wasn't able to get a file handle, or keep it open, for reading/writing.

I just checked online, and it looks to be a bug in Python 2.6, which is horribly end-of-lifed (so is Python 2.7, but you can't run Review Board on Python 3 yet):

https://access.redhat.com/errata/RHSA-2011:0027

"Prior to Python 2.7, programs that used "ulimit -n" to enable communication with large numbers of subprocesses could still monitor only 1024 file descriptors at a time, which caused an exception: ValueError: filedescriptor out of range in select()"

Review Board 2.5 is also end-of-life'd, by the way. I'd suggest moving to Python 2.7 and Review Board 3.0.x, if possible. Review Board 3.0.x requires Python 2.7.

Review Board 4 is entering beta soon, and will be compatible with Python 2.7 and 3.6+.

Christian

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