Thunderbird freezes during sync of O365 Calendars

[gerardcanal]

Your environment

TbSync version: 4.7
EAS-4-TBSync Version: 4.7
Thunderbird version: 115.3.1
OS: Ubuntu 20.04

Expected behavior

Thunderbird should not freeze during calendar sync.

Actual behavior

Thunderbird keeps freezing when TbSync is syncing. This has happened since Thunerdbird 9x. I experience the same issue in another computer with same OS and accounts. I tried reinstalling TbSync and removing the account with no luck.

I only have an O365 account synced, so unsure if this is on TBSync or on the EAS plugin.

Steps to reproduce

Wait for the sync timeout to happen so that the calendar syncs, or perform a manual sync from the interface. It does not seem to always happen (sometimes manual sync is immediate).

When it happens, I see that one of the calendars says it's "Synchronizing (0/1)". The status is "Waiting for changes", with a countdown. It freezes during this time, also when "Waiting for acknowledgement of local changes".

Debug log sent over email.

[gerardcanal]

Hi @Micke3rd,
Where can I find that those are the latest supported versions?

As far as I can see on the Thunderbird addons page and in the manifest, the latest available version is 4.7, which states it supports until TB 115.*. Therefore, I understand that my environment should work. Even so, this has been happening for a while though (surely before 102 was released), but it seems to be worse lately.

I am unsure if the issue belongs here or in EAS-4-TBsync (as I don't know if the freeze comes from the UI or the sync plugin), this could be moved there if more suitable. The issue may be related to jobisoft/EAS-4-TbSync#245.

[Micke3rd]

sorry, you are absolutely right about the versions. I only looked at the latest release here on the site.
I use TB under Windows, where the behavior you describe does not occur.

[jobisoft]

TbSync is trying to be asynchronously, so it surprises me that it can freeze your computer. Servers may not respond directly which forces TbSync to wait for the answer, but it should not "freeze" your computer.

Could you give more details?

[gerardcanal]

Hi @jobisoft,
Thanks for the reply. To clarify, what freezes is Thunderbird's GUI, not the whole computer. What happens is that Thunderbird becomes unresponsive every certain time. When this happens, the UI does not update (doesn't show anything if I am writing a new email), clicks don't seem to get registered. After some seconds, it seems to refresh and register some of the keys/clicks.

For instance, the "new message" button will not do anything until some seconds later, and Ubuntu displays the "Thunderbird is not responding" popup. Every time this happens, TBSync is synchronising, though it does not happen every time TBSync syncs (I believe it's only the times when the long wait happens).

I have recorded a video, and I sent it over email.

[SirFritz]

This happens to me too. Happens on multiple computers both linux and windows.

Steps to reproduce

1. Ensure calendar syncing is ticked
2. Press sync now
3. Thunderbird freezes few seconds later on "Waiting for remote changes (86s)" and "0/62 items processed".

[neidert]

I have the same Problem:
I can synchronize contacts with an Outlook Exchange Server without any problems, but when synchronizing the calendar, TB (only TB, not the entire PC) freezes shortly after synchronization begins: "Waiting for remote changes (84s)" and "27/5822 items processed".

Windows 10 Version 22H2
Thunderbird 128.4.4esr (64-Bit)
TbSync Version 4.11
Provider für Exchange ActiveSync Version 4.12

Thank you for any idea or solution!

[MHReijnen]

I have the same problem as neidert on my new laptop with windows 11 23H2. My old PC with windows 10 22H2 does not have this sync problem. "2190/2240 items processed"

[Crash1602]

synchronizing the calendar, TB (only TB, not the entire PC) freezes shortly after synchronization begins: "Waiting for remote changes (84s)" and "27/5822 items processed".

Windows 11 23H2
Thunderbird 128.5.2esr (64-Bit)
TbSync Version 4.11
Provider für Exchange ActiveSync Version 4.12

I now switched to TB and I have the problem that I only get this problem with a certain calendar, 11 out of 12 calendars work without problems. That's very strange because it's nothing special. Sometimes 50 out of 158 elements are synchronized, sometimes 53, sometimes 58, in the debug log the last entry is this one and otherwise everything looks OK.

** Wed Dec 18 2024 10:23:53 GMT+0100 (Mitteleuropäische Normalzeit) **
[Timezone matched via both offsets (std:-60, dst:-120)] : Europe/Berlin

** Wed Dec 18 2024 10:23:53 GMT+0100 (Mitteleuropäische Normalzeit) **
[Processing recurrence calendar item] : Birthday John (arCPEFAGsnA0axargASEAAAAA4MWqwjxBrJwNGsTGury-RW40AAAABQpM1)

** Wed Dec 18 2024 10:23:53 GMT+0100 (Mitteleuropäische Normalzeit) **
[Timezone matched via both offsets (std:-60, dst:-120)] : Europe/Berlin

At the time 10:23:53 TB freeze and TBSync is "not responding"

The calendar entries that have been synchronized up to that point are also visible in the calendar in the bar on the right, as long as the TBSync window is open with "not responding".

I hope there is a solution for this, because the problem is the show-stopper for me at the moment :-(

[Crash1602]

The issue has been open for quite a while now, so I would like to ask whether the root cause of the problem lies with TPsync or if there is another cause for this issue?

Thanks!