Can't send messages in persistent group chat

[tox-user]

With persistent groups it sometimes happens that I can't send messages in group chat I'm connected to. Unfortunately I don't know how to reproduce this bug and it happens randomly. I appear as online and I can message people, but I am not able to send messages to a group or groups. Normally if I lost connection to a group, I should just be reconnected, but here that never happens. The only way for me to be able to send messages again is to manually leave the group and join it again or restart the client.

[sudden6]

I could reproduce this bug and noticed that I can still receive messages of some people in the group.

[iphydf]

Closing because we got rid of the old PGC PR.

[anthonybilinski]

I just hit this issue running qTox with toxcore v0.2.9. I loaded a persistent group that I've loaded a few times before and was unable to send messages or set title. I still receive peer messages. Restarting qTox doesn't fix the issue. Other groups still work fine. There's no log on message send or title set.

Since the group seems to be stuck this way, I'd be happy to dig into what's going on with gdb if a core dev can give me some guidance.

[anthonybilinski]

We hit the same issue with a new group member, running Toxcore 0.2.9:

We have the same group chat with 3 members, A, B, and C. All three were online, but A's messages weren't delivered to B, or C, and they also didn't receive their own messages. This persisted across multiple client restarts of A.

During the chat, A saw either B or C disconnect and reconnect in the group, and B and C saw each other disconnect and reconnect in their 1-1 chat. After that point, A's messages were then delivered to A and B, but still not C.

After a while, C closed and re-opened their client, and then all of A, B, and C could see everyone's messages. @zugz this is one of the cases you asked me about on IRC IIRC. I'll reopen this issue since it's reproducible on tip and sounds like it's being looked into.

[zugz]

Thanks for reporting this. I'm currently wholly mystified, and haven't managed to reproduce the bug. Some questions to narrow down where the problem could be: Did any of the members join or leave any other groups? Which pairs of A,B,C were tox friends? Am I right to understand that during the period when A's messages weren't being sent to everyone, A nonetheless saw both B and C in the peer list for the group (except during brief disconnections)?