On 02/12/10 23:43, [email protected] wrote:
On Fri, Feb 12, 2010 at 11:05:18PM +0000, John Rice wrote:
The bug we are tracking (14552) is completely reproducible with PM
in the gate:
The test case below doesn't exactly match what's described in 14552.
I took a look through the symptoms in 14552, but there's no obvious
explanation for why a trip through plan_common_exception would cause
api.cancel() to never return. I took a look at api.cancel(). It looks
like changeset 1710 added a line that I removed in 1693. I'm skeptical
that this is causing your problem, but I did delete that line since I
was worried about missed wakeups.
If you delete line api.py:1747, which reads, "self.__canceling = False"
Does this change anything for you?
Changing this does not have any effect on this problem.
However changing plan_common_start to add call to self.disable_cancel()
before raise does fix the problem for me.
Padraig
- Just start PM from the gate, click on Install on the Start Page
for say Wine.
- Click on the Proceed in the WebInstall, so its now acquired the lock.
- Then go to any package in the main list, right click and select
Package Version Info.
- You will get the ImageLockedError raised and displayed to the user.
- Then try and exit PM, it will never exit as a thread has been
kicked off in main application quit to api.cancel().
I'll need to know more about what's causing this problem. How many
threads are in play here? What methods are they calling into?
I'm working on some debug tools for looking at Python cores. If you can
send me a gcore(1) of the PM when it's in this state, I might be able to
figure out what's going on. No promises, though.
It's possible that the operation you're trying to cancel is not in a
cancelable state, i.e. transport name resolution or something like that.
Until we have more information about what PM is doing, though, I'm only
guessing at what the problem could be.
-j
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