[ZODB-Dev] Tracking down a freeze (deadlock?)

[Florent Guillaume]

Florent Guillaume  <fg at nuxeo.com> wrote:
> Florent Guillaume <fg at nuxeo.com> wrote:
> > I'm trying to track down what looks to me like a deadlock, using Zope 
> > 2.7.4. We're using ZEO, on single processor machines. The ZEO client is 
> > configured for 4 threads.

Preliminary info: using my DeadlockDebugger
(http://www.zope.org/Members/nuxeo/Products/DeadlockDebugger)
I got this:

  File "/opt/zope/lib/python/ZPublisher/Publish.py", line 92, in publish
    object=request.traverse(path, validated_hook=validated_hook)
  File "/opt/zope/lib/python/ZPublisher/BaseRequest.py", line 231, in traverse
    object=object.__bobo_traverse__(request)
  File "/opt/zope/lib/python/ZODB/ZApplication.py", line 48, in __bobo_traverse__
    conn=db.open(version)
  File "/opt/zope/lib/python/ZODB/DB.py", line 504, in open
    c._setDB(self)
  File "/opt/zope/lib/python/Products/ZODBMountPoint/Mount.py", line 180, in _setDB
    conn._setDB(conn._db)
  File "/opt/zope/lib/python/Products/ZODBMountPoint/Mount.py", line 176, in _setDB
    self._real_setDB(odb)
  File "/opt/zope/lib/python/ZODB/Connection.py", line 257, in _setDB
    self._flush_invalidations()
  File "/opt/zope/lib/python/ZODB/Connection.py", line 552, in _flush_invalidations
    self._cache.invalidate(self._invalidated)
  File "/appli/zeo/zeocli-192.168.106.6-8080/Products/DICOD/DICODMailingList.py", line 125, in __del__
  File "/opt/zope/lib/python/ZODB/Connection.py", line 599, in setstate
    invalid = self._is_invalidated(obj)
  File "/opt/zope/lib/python/ZODB/Connection.py", line 617, in _is_invalidated
    self._inv_lock.acquire()

I can't see how this lock would not be released.
Does this ring any bell ? Note that mount points come into play...

I'm trying to get tracebacks of other deadlocks to correlate, and with
more threads.

Florent

-- 
Florent Guillaume, Nuxeo (Paris, France)   CTO, Director of R&D
+33 1 40 33 71 59   http://nuxeo.com   fg at nuxeo.com