[Bug 1163609] [NEW] pycurl FTBFS due to segfault in test suite

[Barry Warsaw]

Public bug reported:

pycurl FTBFS in Raring:

https://launchpadlibrarian.net/135742128/buildlog_ubuntu-raring-
amd64.pycurl_7.19.0-5ubuntu6_FAILEDTOBUILD.txt.gz

The problem is that the test suite runs test_internals.py, and this
segfaults.  This is easily reproducible outside the build environment
using the following code:

$ python
>>> from pycurl import CurlMulti
>>> m = CurlMulti()
>>> del m
Segmentation fault (core dumped)

Tracing through with gdb, the problem appears that calling
curl_multi_cleanup() on a CURLM* previously returned by
curl_multi_init() is what crashes.  The cleanup is called from
util_multi_close() in pycurl.c via do_multi_dealloc() but afaict, the
CURLM* handle is valid.  Or at least, it's unchanged from what
curl_multi_init() returns.  The above code is taken directly from
test_internals.py with the extraneous stuff boiled out.

# remove an invalid but closed handle
if 1:
    m = CurlMulti()
    c = Curl()
    c.close()
    m.remove_handle(c)
    del m, c

'c' isn't needed to reproduce the crash.

** Affects: pycurl (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: ftbfs

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https://bugs.launchpad.net/bugs/1163609

Title:
  pycurl FTBFS due to segfault in test suite

Status in “pycurl” package in Ubuntu:
  New

Bug description:
  pycurl FTBFS in Raring:

  https://launchpadlibrarian.net/135742128/buildlog_ubuntu-raring-
  amd64.pycurl_7.19.0-5ubuntu6_FAILEDTOBUILD.txt.gz

  The problem is that the test suite runs test_internals.py, and this
  segfaults.  This is easily reproducible outside the build environment
  using the following code:

  $ python
  >>> from pycurl import CurlMulti
  >>> m = CurlMulti()
  >>> del m
  Segmentation fault (core dumped)

  Tracing through with gdb, the problem appears that calling
  curl_multi_cleanup() on a CURLM* previously returned by
  curl_multi_init() is what crashes.  The cleanup is called from
  util_multi_close() in pycurl.c via do_multi_dealloc() but afaict, the
  CURLM* handle is valid.  Or at least, it's unchanged from what
  curl_multi_init() returns.  The above code is taken directly from
  test_internals.py with the extraneous stuff boiled out.

  # remove an invalid but closed handle
  if 1:
      m = CurlMulti()
      c = Curl()
      c.close()
      m.remove_handle(c)
      del m, c

  'c' isn't needed to reproduce the crash.

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