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Bug #22382 ยป ractor_shareable_write_repro.rb

jamescook83 (James Cook), 09/24/2026 11:56 PM

 
# frozen_string_literal: true
require "tmpdir"

dir = Dir.mktmpdir
TRIES = 300

1.upto(TRIES) do |try|
$stderr.puts "try #{try} of #{TRIES}"
str = Ractor.make_shareable(Random.bytes(512 * 1024))
# Control: one prior write from a single Ractor prevents the crash.
File.binwrite(File.join(dir, "first"), str) if ENV["WRITE_FIRST"]

go = Process.clock_gettime(Process::CLOCK_MONOTONIC) + 0.02
12.times.map do |n|
Ractor.new(str, File.join(dir, "w#{n}"), go) do |s, path, at|
Thread.pass until Process.clock_gettime(Process::CLOCK_MONOTONIC) >= at # start together
File.binwrite(path, s)
end
end.each(&:join)

GC.start
end

puts "finished #{TRIES} tries without crashing"
    (1-1/1)