Bug #21400: rb_bug() hit when killing current root fiber on non-main thread

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: 3.5.0dev
• Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN

[luke-gru (Luke Gruber)]

This following code hits an rb_bug:

Thread.new { Fiber.current.kill }.join

Normally fibers gracefully handle this case by terminating and switching to another fiber, but if there is no other fiber it raises the FIBER_FATAL_FIBER_KILLED error and this is not caught by the starting thread, resulting in a bug.

[luke-gru (Luke Gruber)]

I created a PR: https://github.com/ruby/ruby/pull/13526

• Status changed from Open to Closed

Applied in changeset git|54ef6c312a2154f26e971af9e4a483d5d377730e.

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[Bug #21400] Fix rb_bug() when killing current root fiber in non-main thread (#13526)

Fixes the following:

Thread.new { Fiber.current.kill }.join