arnomi
I recently ran across a problem looking very similar to (Erlang/Elixir Interactive Shell jobs get stuck when printing to output) but regrettably it is not easily reproducible.
What we observed (running on OTP 21.1) is that if remote shells are kept connected (but unused) there is the chance that they go into a rogue mode where they start consuming a lot of CPU but without actually doing any work. We’ve traced the problem to the group.erl process which seems to be stuck in an endless loop with driver.erl. The group.erl process is receiving data (otp/lib/kernel/src/group.erl at master · erlang/otp · GitHub) and the driver is constantly sending empty messages of the form {#PID<0.73.0>, {:data, []}}. The result is that the remote shell process is taking up as much of the CPU as it can with all work spent in the more_data function while it should not be doing anything.
Does any of this sound familiar?
Where Next?
Trending in Questions
Other Trending Topics
Latest on Elixir Forum
Sponsor Spotlight
Supporting innovation across the BEAM ecosystem.
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #library
- #deployment
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #elixirconf
- #channels
- #exunit
- #code-sync
- #discussion
- #podcasts
- #javascript
- #onsite
- #dialyzer
- #docker
- #authentication
- #ai
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #elixirconf-us
- #blog-post
- #ecto-query
- #elixir-ls
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #elixirconf-eu
- #processes
- #security
- #api
- #forms
- #performance
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Elixir, Erlang & BEAM conferences from Code Sync. Next: ElixirConf EU 2027
Master modern tools, write cleaner code, and tackle real-world challenges.
**Building the future of software with AI, trust, and human connection.**
The deployment platform built for Elixir: PaaS ease, VPS control.
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"
Showing Posts 1 to 4- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
hubertlepicki
I have reported the problem you are referencing on https://bugs.erlang.org and it is probably best place to reach out the Erlang team as it seems like another bug you found
arnomi
Could you send me the ticket number for this? I did a search earlier and couldn’t find anything related.
hubertlepicki
ckhrysze
I may have run into the same thing, but also can’t reliably reproduce. If anyone else can, the new ticket number is: