“CalendarStorageException: Empty result from content provider when adding event”

[navid-zamani]

Since there is no place to report bugs, I’m forced to post this here in a free format:

I get the above mentioned error when trying to sync.
I suspect it was caused by a bug in Lightning, but I switched to KOrganzizer as a result and it lets me edit and save the event just fine, which I did, to make sure the event on the Radicale server was valid. Lightning is fine with it now too (but I set it to read-only there, to avoid Lightning messing up some more).

I’ve added the debug info ZIP below, and also added the ICS file from the server to it.
davx5-debug.zip
Everything starting with “My…” is anonymized manually.

I am unable to find anything wrong with the ICS file, and since KOrganizer, Radicale, Thunderbird and an online validator handle it fine now, but DAVx⁵ (or more correctly, Android’s calendar provider or something) does not, all I can do it post it here and hope somebody more experienced can see what’s wrong.

It’s bad because I can’t use my calendar on my phone because of it right now. :/

[rfc2822]

Since there is no place to report bugs, I’m forced to post this here in a free format:

And yet here are you are, reporting. What do you mean with a "free format"? And who forces you to do anything? (There's also https://www.davx5.com/support)

I could reproduce your problem with an Android 14 emulator and our Radicale test server. The system adb logs show this calendar provider error:

09-10 20:01:13.609  5715  5955 D ical4android: [BatchOperation] Committing 10 operations:
09-10 20:01:13.610  5715  5955 D ical4android: [BatchOperation] #0: ContentProviderOperation(type=insert uri=content://com.android.calendar/events?account_name=test&account_type=bitfire.at.davdroid&caller_is_syncadapter=true values={organizer=test, duration=P1D, sync_data1=d8844933d1c58bd1b853a0d305a1aad6d5b1c76e0c20511e2f31c242e50bc4fb, sync_data2=1, sync_data3=0, sync_data4=null, description=null, allDay=1, exdate=20210129T000000Z,20210212T000000Z,20210226T000000Z,20210423T000000Z,20210430T000000Z,20210501T000000Z,20210507T000000Z,20210521T000000Z,20210528T000000Z,20210604T000000Z,20210611T000000Z,20210618T000000Z,20210619T000000Z,20210625T000000Z,20210702T000000Z,20210716T000000Z,20210723T000000Z,20210730T000000Z,20210806T000000Z,20210813T000000Z,20210820T000000Z,20210827T000000Z,20210903T000000Z,20210910T000000Z,20210911T000000Z,20210917T000000Z,20211001T000000Z,20211008T000000Z,20211015T000000Z,20211029T000000Z,20211112T000000Z,20211113T000000Z,20211119T000000Z,20211126T000000Z,20211203T000000Z,20211204T000000Z,20211210T000000Z,20211224T000000Z,20220107T000000Z,20220114T000000Z,20220115T000000Z,20220121T000000Z,20220128T000000Z,20220204T000000Z,20220218T000000Z,20220225T000000Z,20220304T000000Z,20220311T000000Z,20220325T000000Z,20220408T000000Z,20220422T000000Z,20220429T000000Z,20220506T000000Z,20220520T000000Z,20220527T000000Z,20220610T000000Z,20220617T000000Z,20220624T000000Z,20220701T000000Z,20220708T000000Z,20220715T000000Z,20220722T000000Z,20220729T000000Z,20220805T000000Z,20220812T000000Z,20220819T000000Z,20220825T000000Z,20220826T000000Z,20220902T000000Z,20220909T000000Z,20220923T000000Z,20220930T000000Z,20221007T000000Z,20221028T000000Z,20221104T000000Z,20221111T000000Z,20221118T000000Z,20221125T000000Z,20221202T000000Z,20221209T000000Z,20221216T000000Z,20221230T000000Z,20230106T000000Z,20230113T000000Z,20230120T000000Z,20230127T000000Z,20230203T000000Z,20230210T000000Z,20230217T000000Z,20230224T000000Z,20230303T000000Z,20230310T000000Z,20230316T000000Z,20230317T000000Z,20230323T000000Z,20230324T000000Z,20230331T000000Z,20230407T000000Z,20230414T000000Z,20230421T000000Z,20230428T000000Z,20230505T000000Z,20230512T000000Z,20230519T000000Z,20230526T000000Z,20230602T000000Z,20230609T000000Z,20230616T000000Z,20230623T000000Z,20230630T000000Z,20230706T000000Z,20230707T000000Z,20230714T000000Z,20230818T000000Z, exrule=null, accessLevel=3, hasAttendeeData=0, uid2445=9e2cd7fc-bf69-4035-a149-bec9aae8df15, eventLocation=null, dirty=0, dtend=null, eventStatus=1, rdate=20230908T000000Z,20210724T000000Z,20210911T000000Z,20211009T000000Z,20211113T000000Z,20211204T000000Z,20220115T000000Z,20220219T000000Z,20220825T000000Z,20220908T000000Z,20220925T000000Z,20221006T000000Z,20230223T000000Z,20230316T000000Z,20230323T000000Z,20230706T000000Z,20230713T000000Z, rrule=FREQ=WEEKLY;BYDAY=TH, title=#MyEvent, eventTimezone=UTC, calendar_id=7, _sync_id=72d5edffca44a48a4d630b7caf95dc527bbddfa4.ics, eventColor_index=null, deleted=0, dtstart=1694131200000, availability=1})
09-10 20:01:13.610  5715  5955 D ical4android: [BatchOperation] #1: ContentProviderOperation(type=insert uri=content://com.android.calendar/reminders?account_name=test&account_type=bitfire.at.davdroid&caller_is_syncadapter=true values={method=1, event_id=android.content.ContentProviderOperation$BackReference@659274b, minutes=-540})
09-10 20:01:13.610  5715  5955 D ical4android: [BatchOperation] #2: ContentProviderOperation(type=insert uri=content://com.android.calendar/extendedproperties?account_name=test&account_type=bitfire.at.davdroid&caller_is_syncadapter=true values={name=categories, value=MyCategory, event_id=android.content.ContentProviderOperation$BackReference@cf0c528})
09-10 20:01:13.611  5715  5955 D ical4android: [BatchOperation] #3: ContentProviderOperation(type=insert uri=content://com.android.calendar/extendedproperties?account_name=test&account_type=bitfire.at.davdroid&caller_is_syncadapter=true values={name=vnd.android.cursor.item/vnd.ical4android.unknown-property, value=["CREATED","20230907T152831Z"], event_id=android.content.ContentProviderOperation$BackReference@3865241})
09-10 20:01:13.611  5715  5955 D ical4android: [BatchOperation] #4: ContentProviderOperation(type=insert uri=content://com.android.calendar/extendedproperties?account_name=test&account_type=bitfire.at.davdroid&caller_is_syncadapter=true values={name=vnd.android.cursor.item/vnd.ical4android.unknown-property, value=["X-MOZ-GENERATION","106"], event_id=android.content.ContentProviderOperation$BackReference@c8703e6})
09-10 20:01:13.611  5715  5955 D ical4android: [BatchOperation] #5: ContentProviderOperation(type=insert uri=content://com.android.calendar/extendedproperties?account_name=test&account_type=bitfire.at.davdroid&caller_is_syncadapter=true values={name=vnd.android.cursor.item/vnd.ical4android.unknown-property, value=["X-MOZ-LASTACK","20230830T193312Z"], event_id=android.content.ContentProviderOperation$BackReference@290ed27})
09-10 20:01:13.612  5715  5955 D ical4android: [BatchOperation] #6: ContentProviderOperation(type=insert uri=content://com.android.calendar/extendedproperties?account_name=test&account_type=bitfire.at.davdroid&caller_is_syncadapter=true values={name=vnd.android.cursor.item/vnd.ical4android.unknown-property, value=["X-MOZ-SNOOZE-TIME-1623369600000000","20210611T180538Z"], event_id=android.content.ContentProviderOperation$BackReference@3210bd4})
09-10 20:01:13.612  5715  5955 D ical4android: [BatchOperation] #7: ContentProviderOperation(type=insert uri=content://com.android.calendar/extendedproperties?account_name=test&account_type=bitfire.at.davdroid&caller_is_syncadapter=true values={name=vnd.android.cursor.item/vnd.ical4android.unknown-property, value=["X-MOZ-SNOOZE-TIME-1637884800000000","20211127T213418Z"], event_id=android.content.ContentProviderOperation$BackReference@a4d17d})
09-10 20:01:13.612  5715  5955 D ical4android: [BatchOperation] #8: ContentProviderOperation(type=insert uri=content://com.android.calendar/extendedproperties?account_name=test&account_type=bitfire.at.davdroid&caller_is_syncadapter=true values={name=vnd.android.cursor.item/vnd.ical4android.unknown-property, value=["X-MOZ-SNOOZE-TIME-1639094400000000","20211212T234456Z"], event_id=android.content.ContentProviderOperation$BackReference@1af7872})
09-10 20:01:13.613  5715  5955 D ical4android: [BatchOperation] #9: ContentProviderOperation(type=insert uri=content://com.android.calendar/extendedproperties?account_name=test&account_type=bitfire.at.davdroid&caller_is_syncadapter=true values={name=vnd.android.cursor.item/vnd.ical4android.unknown-property, value=["X-MOZ-SNOOZE-TIME-1639699200000000","20220102T091215Z"], event_id=android.content.ContentProviderOperation$BackReference@89534c3})
09-10 20:01:13.613  5715  5955 D ical4android: [BatchOperation] Running 10 operations (0 .. 9)
!!! → 09-10 20:01:13.617  3167  3303 W RecurrenceProcessor: DateException with r=FREQ=WEEKLY;WKST=MO;BYDAY=TH rangeStart=135795834880 rangeEnd=9223372036854775807
!!! → 09-10 20:01:13.617  3167  3303 W CalendarProvider2: Could not calculate last date.

Seems to come from here: https://cs.android.com/android/platform/superproject/main/+/main:packages/providers/CalendarProvider/src/com/android/providers/calendar/CalendarProvider2.java;l=3255;drc=97b2d1432b7ed532acb6020534f0e5321e712873

Which means that we would have to dig through calculateLastDate to find why Android doesn't like your event …

Seems to come from here: https://cs.android.com/android/platform/superproject/main/+/main:frameworks/opt/calendar/src/com/android/calendarcommon2/RecurrenceProcessor.java;l=1100;drc=7bb1f3b0ebe44e28fbd3e34da7e6995d0c7a2d82, i.e. dig through all the expand() and getLastOccurrence() methods … 😄

Follow up in bitfireAT/ical4android#113

[navid-zamani]

And yet here are you are, reporting.

Well, yes, I could also go piss in your tea, but I suspect you’d prefer if I used your toilet. But if the toilet is locked up with a big arrow pointing me to use the tea kettle, I at least want to give you the courtesy to announce what I am going to do, before doing as requested. 😁

In other words: I feel uneasy about wasting your time with such an informal way of reporting bugs. That’s all.

So with “free format” I merely mean that it lets people write whatever, and not adhere to good bug reporting standards (e.g. reproducability), which will result in wasting time with bad bug reports, and hence ultimately cause me to harm your project, which harms me too. Something I do not want. Hence the “forced” part and grumpy start. :)

And worst of all: I have to waste your time to just explain myself to you with this answer here now.

[rfc2822]

And worst of all: I have to waste your time to just explain myself to you with this answer here now.

You don't have to do anything. Please feel free to not contact us or post in discussions if you don't feel comfortable with it. By the way the same applies here, I'm replying to your request completely voluntarily (but maybe I'll discontinue doing so). No force anywhere. 😃

[navid-zamani]

Interesting, as Lightning failed at the exaxt same problem AFAIcan tell.

[navid-zamani]

I'm replying to your request completely voluntarily (but maybe I'll discontinue doing so). No force anywhere. 😃

Precisely. That is why I value your time and effort and do not want to waste it. ^^
(I have no money to donate, and all I can offer is rare muscadine grapes, apples or juneberries as much as you can eat for anyone in Cologne in season on a Sunday. At least until my own software project is ready. :)

Have a nice night.