[Kde-pim] Help with crash from CalDav

[Volker Krause]

On Thursday 13 September 2012 09:52:18 Allen Winter wrote:
> I added a Google Calendar resource a couple days ago.
> 
> Since then, I hit the enclosed assert about once a day.
> Any Akonadi or Dav experts that can look at the code for
> akonadi_davgroupware_resource and figure out what's happening?
> 
> #2  0x00007f3c65fd7363 in qt_message_output (msgType=QtFatalMsg,
> buf=0x1dc70c8 "ASSERT failure in ResourceBase::collectionsRetrieved():
> \"Calling collectionsRetrieved() although no collection retrieval is in
> progress\", file /data/kde/trunk/KDE/kdepimlibs/akonadi/resourcebase.cpp,
> "...) at global/qglobal.cpp:2266 #3  0x00007f3c65fd74df in
> qt_message(QtMsgType, const char *, typedef __va_list_tag __va_list_tag *)
> (msgType=QtFatalMsg, msg=0x7f3c661a61b0 "ASSERT failure in %s: \"%s\", file
> %s, line %d", ap=0x7fff69fb6548) at global/qglobal.cpp:2312 #4 
> 0x00007f3c65fd7ca9 in qFatal (msg=0x7f3c661a61b0 "ASSERT failure in %s:
> \"%s\", file %s, line %d") at global/qglobal.cpp:2495 #5 
> 0x00007f3c65fd6f5b in qt_assert_x (where=0x7f3c64601f40
> "ResourceBase::collectionsRetrieved()", what=0x7f3c64601ef0 "Calling
> collectionsRetrieved() although no collection retrieval is in progress",
> file=0x7f3c646006b8

These asserts are triggered by calling methods of ResourceBase 
(collectionsRetrieved() here) that you are not allowed to call with the 
current task. If it's only happening sporadically the most likely scenario is 
that the resource ends up processing multiple tasks at the same time, e.g. 
like this:
(1) got a request to sync folders
(2) start job to retrieve folder list from backend
(3) erroneously claim you are done with that task
(4) random other request comes in and resource starts handling it 
(5) job from (2) returns some results, which are processed and passed to 
collectionsRetrieved()
(6) ResourceBase notices that you are currently not syncing collections (due 
to (3)) and thus asserts.

Since this is all asynchronously, finding (3) can be a bit cumbersome.

regards,
Volker
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