Duplicate android entries on read-only calendars



  • Hello,

    I've recently subscribed to fastmail, and I was looking to start using their calendar (caldav) service too.
    Configured it in DavDroid (f-droid version for now), fairly straightforward, and it started syncing fine to my Android calendar (on Marshmallow, OnePlus3)

    On Fastmail I have a few calendars of my own, and a few I pull in from various sources. These always display fine on FM - no duplicate entires or anything..

    After a few days I started noticing duplicate entries in these calendars, some double, some triple, this morning quadruple.
    Removing the calendar from sync in DavDroid, refreshing the Android calendar, and then re-adding them makes the problem go away.. for a little while. I've already seen duplicate entries again on one of my calendars.

    Steps to reproduce: remove account, readd account, after a while they pop up duplicate/triplicate again


  • developer

    @devilkin I couldn't reproduce the problem. (What is "a while"? A few days?) Which events must be in the calendar? Please provide more detailed steps to reproduce, so that I can reproduce the problem (for instance, which event do I have to create etc.). Does it only happen for events with specific characteristics or for all events?

    Please provide debug info and verbose logs of a synchronization process where duplicate entries are created.



  • @rfc2822
    It seems like all events on the calendar are duplicated at that point.
    The only difference I saw was that it only happened to r/o calendars, not to the ones that FM is hosting for me directly. Also not all r/o calendars, but several.

    Debug info: https://paste.fedoraproject.org/415184/
    External log: http://www.kcore.org/tmp/davdroid-20239-20160827-150130.txt



  • Any idea what might be causing this? It keeps reoccurring. Might have to do with bad connectivity?


  • developer

    @devilkin said in Duplicate android entries on read-only calendars:

    Any idea what might be causing this? It keeps reoccurring. Might have to do with bad connectivity?

    Unfortunately, I don't have any idea. Do you have any other clients (Thunderbird, …) to test? If the problem occurs for them, too, it's probably a server problem.



  • I'm actually using Thunderbird too, and there the issue does not show up. Nor does it via a plugin for outlook :/

    EDIT: i installed another CalDav receiver (aCalDav - https://f-droid.org/repository/browse/?fdid=de.we.acaldav) next to yours on my phone. Seems to not trigger these issues.

    I'd prefer to keep using yours, as it is a lot more refined, but right now, this bug is a showstopper for me.


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