after version 7.13.1 upgrade all existing downloads stopped downloading with anynomity enabled about tribler HOT 8 OPEN

I've finally been able to reproduce this (on Windows, using main and hops=1), but it certainly took a while. Now that I had a chance to take a closer look, I'm not sure this is aTunnelCommunity issue, although considering the amount of traffic that's going through it may very well be a contributing factor.

When the downloads stop, all of the network connectivity seems to stop working as well. Circuits can't be created, peer counts in all communities drop (but not to 0), and the IPv8 socket total_down never changes (i.e., no incoming messages). Changing the hop count to 0 does work, but of course that happens outside of Python.

If the issue indeed started appearing in v7.13.1, it could be related to #7677. I wonder if anyone is experiencing similar issues on linux/mac

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I just performed a fresh install of 7.13.1 and I cannot reproduce this. Could you provide more info? In particular, it would help us if you could provide a screenshot of the Tunnels / Peers tab in the debug screen (please anonymize the IP/port/mid numbers):

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There seems to be something going wrong when creating multi-hop circuits, and I've also seen the case where less circuits are getting created than expected (which could intermittently stop a download). Also, the information in the debug panel doesn't always seem to be correct. I'll investigate this further.

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This is a lot harder to reproduce than I originally thought. I was having problems creating 3-hops circuits initially, but after waiting long enough, they would eventually appear. The slowness of multi-hop circuits isn't something we can fix obviously, as that just depends on which node you select for the next relay.

One thing that could slow down or even stop downloads is when circuits are suddenly destroyed. This can always happen, and Tribler does need to deal with this -hopefully rare- situation. So, during testing I periodically destroyed all available circuits to see if Tribler would recover, which it did.

I did notice some problems with circuit management (i.e., how many circuits are created/destroyed), which I'll fix. But I can't reproduce the case where downloads can't recover altogether. Although another user on our forum seems to experience something similar with v7.13.

If anyone can post pictures of the Tunnels / Circuits and Tunnels / Peers tabs (as described above) while they experience the problem, that would be really helpful.

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@inekestijnman @herrJones We making progress trying to fix this one.
Thank you for reporting! We now trying to switch 'reactor core' to see if that was the issue.

Coming days we should have some new stable + experimental builds to try out.
New stuff should yield a 160 Mbit/sec performance boost for anonymous downloading 😁

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It looks like a duplicate of

• #7972

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