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Document Ruby bug #21195 in the README #1189

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petergoldstein merged 2 commits into from
Oct 4, 2026
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Document Ruby bug #21195 in the README #1189

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Document Ruby bug #21195 in the README
petergoldstein Oct 4, 2026
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Add PR number to changelog entry
petergoldstein Oct 4, 2026
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5 changes: 5 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -4,6 +4,11 @@ Dalli Changelog
Unreleased
==========

Notes:

- Document [Ruby bug 21195](https://bugs.ruby-lang.org/issues/21195), a VM crash (`[BUG] rb_sys_fail_path_in(io_fillbuf, ...) - errno == 0`) when a socket read using `IO#timeout` is interrupted by a signal, in the README (#1189)
- Affects Ruby 3.3.0–3.3.7 and 3.4.0–3.4.2; fixed in 3.3.8 and 3.4.3

Development:

- Fix flaky failover tests (#1184)
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10 changes: 10 additions & 0 deletions README.md
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Expand Up @@ -24,6 +24,16 @@ latest release. Earlier 1.6.x servers are not supported: the meta protocol
rejects unknown flags outright, so features added after a server's release fail
with `CLIENT_ERROR invalid flag` rather than degrading.

### Known Ruby issue: crash on an interrupted socket read

Dalli sets socket timeouts with `IO#timeout`. Ruby 3.3.0–3.3.7 and 3.4.0–3.4.2 have a bug ([Ruby #21195](https://bugs.ruby-lang.org/issues/21195)) where a timed read interrupted by a signal aborts the whole process:

```
[BUG] rb_sys_fail_path_in(io_fillbuf, fd:N ) - errno == 0
```

The crash is inside Ruby itself, so it can't be rescued. It's fixed in Ruby 3.3.8 and 3.4.3. If you see this crash, upgrade to one of those versions or later.

## Configuration Options

### Namespace
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