[ruby-core:113012] [Ruby master Bug#19546] IO::Buffer is incorrectly invoking fiber scheduler interface.

Issue #19546 has been updated by ioquatix (Samuel Williams).

Backport changed from 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN to 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED, 3.2: REQUIRED

Fixed by <https://github.com/ruby/ruby/commit/466aa8010fb49f9ec6c78ea1de4e8ca0965f4fdf>.

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Bug #19546: IO::Buffer is incorrectly invoking fiber scheduler interface.
https://bugs.ruby-lang.org/issues/19546#change-102546

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: ioquatix (Samuel Williams)
* Backport: 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED, 3.2: REQUIRED
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(Original bug report: <https://github.com/socketry/async/issues/224>)

The `IO::Buffer` implementation incorrectly calls `rb_fiber_scheduler_io_write` with the `size_t`s converted to `VALUE`s: https://github.com/ruby/ruby/blob/400ccb16eefe4e21c4e3eacab4fd0f208fc5e151/io_buffer.c#L2607

But that function expects `size_t`s: https://github.com/ruby/ruby/blob/400ccb16eefe4e21c4e3eacab4fd0f208fc5e151/scheduler.c#L542

(And probably the same for the other scheduler methods + data types.)

Fixed by <https://github.com/ruby/ruby/pull/7593>.



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