IndexError: pop from empty list

[Klaus59]

Zum Reproduzieren

Während der Ausführung von GET auf /attachment/ticket/52684/ hat Trac einen internen Fehler gemeldet.

(Bitte geben Sie hier weitere Details an)

Anfrageparameter:

{u'action': u'new', 'path': u'52684/', 'realm': u'ticket'}

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:49.0) Gecko/20100101 Firefox/49.0

Systeminformationen

Systeminformation nicht verfügbar

Aktive Plugins

Plugininformation nicht verfügbar

Python-Zurückverfolgungsinformationen

Traceback (most recent call last):
  File "/var/www/trac/virtualenv/lib/python2.7/site-packages/trac/web/main.py", line 562, in _dispatch_request
    dispatcher.dispatch(req)
  File "/var/www/trac/virtualenv/lib/python2.7/site-packages/trac/web/main.py", line 269, in dispatch
    iterable=chrome.use_chunked_encoding)
  File "/var/www/trac/virtualenv/lib/python2.7/site-packages/trac/web/chrome.py", line 1115, in render_template
    encoding='utf-8')
  File "/usr/lib/python2.7/dist-packages/genshi/core.py", line 184, in render
    return encode(generator, method=method, encoding=encoding, out=out)
  File "/usr/lib/python2.7/dist-packages/genshi/output.py", line 58, in encode
    for chunk in iterator:
  File "/usr/lib/python2.7/dist-packages/genshi/output.py", line 350, in __call__
    for kind, data, pos in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/output.py", line 829, in __call__
    for kind, data, pos in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/output.py", line 669, in __call__
    for kind, data, pos in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/output.py", line 774, in __call__
    for kind, data, pos in chain(stream, [(None, None, None)]):
  File "/usr/lib/python2.7/dist-packages/genshi/output.py", line 594, in __call__
    for ev in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/core.py", line 289, in _ensure
    for event in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/core.py", line 289, in _ensure
    for event in stream:
  File "/var/www/trac/virtualenv/lib/python2.7/site-packages/trac/web/chrome.py", line 1321, in _strip_accesskeys
    for kind, data, pos in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/core.py", line 289, in _ensure
    for event in stream:
  File "/var/www/trac/virtualenv/lib/python2.7/site-packages/trac/web/chrome.py", line 1310, in _generate
    for kind, data, pos in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/core.py", line 289, in _ensure
    for event in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/core.py", line 289, in _ensure
    for event in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/filters/transform.py", line 706, in _unmark
    for mark, event in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/filters/transform.py", line 1101, in __call__
    for mark, event in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/filters/transform.py", line 118, in __iter__
    event = self.stream.next()
  File "/usr/lib/python2.7/dist-packages/genshi/filters/transform.py", line 734, in __call__
    for mark, event in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/filters/transform.py", line 702, in _mark
    for event in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/template/base.py", line 618, in _include
    for event in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/template/markup.py", line 378, in _match
    ctxt, start=idx + 1, **vars):
  File "/usr/lib/python2.7/dist-packages/genshi/template/markup.py", line 378, in _match
    ctxt, start=idx + 1, **vars):
  File "/usr/lib/python2.7/dist-packages/genshi/template/markup.py", line 326, in _match
    for event in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/template/base.py", line 558, in _flatten
    for kind, data, pos in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/core.py", line 289, in _ensure
    for event in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/path.py", line 588, in _generate
    subevent = next()
  File "/usr/lib/python2.7/dist-packages/genshi/template/base.py", line 618, in _include
    for event in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/template/markup.py", line 315, in _strip
    event = next()
  File "/usr/lib/python2.7/dist-packages/genshi/template/base.py", line 558, in _flatten
    for kind, data, pos in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/core.py", line 289, in _ensure
    for event in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/path.py", line 588, in _generate
    subevent = next()
  File "/usr/lib/python2.7/dist-packages/genshi/template/base.py", line 618, in _include
    for event in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/template/markup.py", line 315, in _strip
    event = next()
  File "/usr/lib/python2.7/dist-packages/genshi/template/base.py", line 558, in _flatten
    for kind, data, pos in stream:
  File "/usr/lib/python2.7/dist-packages/genshi/filters/i18n.py", line 178, in _generate
    for event in msgbuf.translate(gettext(msgbuf.format())):
  File "/usr/lib/python2.7/dist-packages/genshi/filters/i18n.py", line 1051, in translate
    events = self.events[order].pop(0)
IndexError: pop from empty list

[neverpanic (Clemens Lang)]

dummy file to test attaching files

[neverpanic (Clemens Lang)]

That URL works fine for me. I cannot reproduce the problem.

[neverpanic (Clemens Lang)]

Problem found, it happens when the German locale is selected. Workaround: Set Trac to english in ​https://trac.macports.org/prefs/language. I'll look into the details.

[neverpanic (Clemens Lang)]

See

• ​https://trac.edgewall.org/wiki/TracFaq?version=21#Q:WhydoIseeIndexError:popfromemptylistwhentryingtoaddanattachment
• ​https://trac.edgewall.org/ticket/11184
• ​https://genshi.edgewall.org/ticket/566
• ​https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=775746

So it seems this bug affects us because Debian hasn't backported the fix into their current stable version, which we use as the source for genshi. I'll switch to a separate newer genshi installation with the fix.

[neverpanic (Clemens Lang)]

There is no new Genshi release with the fix. The latest releases are currently 0.6.1 and 0.7, both of which suffer from the problem.

I downgraded to Genshi 0.6.0, which solves the issue. Thank you for the report.