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wire 2026-10-26
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DynamicSupervisor keeps shutdown reasons, stops leaking timeout messages

By RepoJournal · Filed · About Elixir & Phoenix · Composed from the cited sources · methodology

José Valim
1 person shipped this
José Valim @josevalim 2 cited

Two commits from José Valim against elixir-lang/elixir close the same issue, tightening how DynamicSupervisor reports child exits and when timeout messages reach a caller's mailbox.

Do not discard reason in DynamicSupervisor, closes #16020 elixir-lang/elixir

by José Valim

DynamicSupervisor no longer discards the reason when a child terminates. This is a behavioral change to what your supervisor reports, so code that pattern-matched on the previously lossy shutdown reason should be re-checked before you rely on it.

Do not leak timeout messages, closes #16020 elixir-lang/elixir

by José Valim

A companion commit stops timeout messages from leaking, which matters anywhere you use receive with a timeout and expect a clean mailbox: a stale timeout message left behind is a message your next receive can match. Both commits close the same issue.

$ ls elixir/reviews/ # the step-back reads

the week in review Ecto stops caching interpolated JSON paths and splices the month in review Elixir patches JSON and URI denial-of-service bugs
Full archive → Weekly reviews →

Quick answers

What shipped in Elixir & Phoenix on October 26, 2026?
Two commits from José Valim against elixir-lang/elixir close the same issue, tightening how DynamicSupervisor reports child exits and when timeout messages reach a caller's mailbox. In total, 2 commits landed.
Who contributed to Elixir & Phoenix on October 26, 2026?
1 developer shipped this update, including José Valim.
What were the notable Elixir & Phoenix updates?
Do not discard reason in DynamicSupervisor, closes #16020 and Do not leak timeout messages, closes #16020.
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$ log Elixir & Phoenix --recent

Spec-only Elixir fixes: map_get, Process.spawn, send_after 20 shipped Elixir tightens open-map intersection in the type checker 33 shipped Ecto gains encrypted fields and HMAC, Phoenix reorders its join handshake 17 shipped LiveView refuses hostless joins, Elixir keeps BDD keys in immediates 8 shipped

$ log --all # elsewhere on the wire

Agent Security Quiet day in agent security as guard coverage reaches four clients Alignment & Post-training verl defaults Ascend RL mode, open-instruct unblocks SFT packing

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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