Memory Leak on Linux

[cinderblock]

I've been running Deluged 2.0.3 on my server for a while now. I have nearly 500 torrents seeding but only a few active at a time. It's mostly stable, except every ~month I take a look and it's using 100% of available memory (32GB) and CPU.

Restarting the service brings the memory usage back down to ~400MB. However it starts growing pretty quickly. I restarted my current instance a day or two ago and it's currently using nearly 5GB. I just did a quick test and looked at the RSS memory usage across a 10 minute interval. It seems to be growing at 182 kBps. (At this rate it should only take 2 days to fill all 32GB! So clearly this 10min sample doesn't capture the whole picture...)

I have a nearly identical instance of Deluged running on the same machine for a separate network. It only runs ~50 torrents and never seems to have these memory leak problems.

[cinderblock]

I think this is actually a duplicate of #3327. I found some logs spewing out many "Unhandled error in Deferred"s that match what is described there.

[Alexey104]

This is the libtorrent issue which was finally fixed in 1.2.10: ​https://github.com/qbittorrent/qBittorrent/issues/12326

[cinderblock]

Glad to hear. What's it going to take for this to be incorporated to Deluge? Should I be able to update to latest libtorrent, reinstall deluge python3 bindings, and have it work?

[Alexey104]

Yes, just compile libtorrent with python bindings using the latest commit from 1.2(not 2.0!) branch(if your distro doesn't already provide it in the official repos), and it should solve your problem. I had been experiencing exactly the same issue that you describe, and 1.2.10 completely solved it for me.