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["Olivier Dony \(OpenERP\)" <885682@xxxxxxxxxxxxxxxxxx>]

** Summary changed:

- [Trunk] Re-Entrant lock deadlock in upgrade_module
+ [Trunk] Windows-specific random deadlock in upgrade_module

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https://bugs.launchpad.net/bugs/885682

Title:
  [Trunk] Windows-specific random deadlock in upgrade_module

Status in OpenERP Server:
  New

Bug description:
  Hi.

  I'm using OpenERP Trunk (updated at the begining of the week) and I
  encounter a deadlock problem with threads. The bug is not easy to
  reproduce, because it's kind of random. The better I found to trigger
  it is to install/uninstall the same module different times.

  I looked into the code with pdb, and found that the block line is this
  one [1]:

  openerp/module/registry.py:
      with cls.registries_lock:

  I enabled the debug on the lock (passing verbose=True to the RLock
  constructor). Here is a "normal" output :

  netrpc-client-127.0.0.1:51862: <_RLock owner='netrpc-client-127.0.0.1:51862' count=1>.acquire(1): initial success
  netrpc-client-127.0.0.1:51862: <_RLock owner='netrpc-client-127.0.0.1:51862' count=2>.acquire(1): recursive success
  netrpc-client-127.0.0.1:51862: <_RLock owner='netrpc-client-127.0.0.1:51862' count=1>.release(): non-final release
  netrpc-client-127.0.0.1:51862: <_RLock owner=None count=0>.release(): final release

  But when there is the deadlock, I only get this output, before the
  server stop to respond :

  netrpc-client-127.0.0.1:51872: <_RLock owner='netrpc-client-127.0.0.1:51872' count=1>.acquire(1): initial success
  netrpc-client-127.0.0.1:51872: <_RLock owner='netrpc-client-127.0.0.1:51872' count=2>.acquire(1): recursive success

  I don't understand why it doesn't work because we can see that is has
  been release correctly just before (here, the output is from the same
  instance).

  Notes :

  - I couldn't trigger the bug on Linux, everything seems ok. But
  running the server on windows make this happen almost everytime. I
  don't really understand why, but I'm not an expert.

  - I was using the GTK Client

  - Using Python 2.6, with all libs installed manually using pip and
  .exe distributions.

  Thanks for working on this !

  [1] http://bazaar.launchpad.net/~openerp/openobject-
  server/trunk/view/head:/openerp/modules/registry.py#L149

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