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Segmentation fault with array of Fibers #3230

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dalarenal opened this issue Oct 26, 2016 · 0 comments
Closed

Segmentation fault with array of Fibers #3230

dalarenal opened this issue Oct 26, 2016 · 0 comments

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@dalarenal
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@dalarenal dalarenal commented Oct 26, 2016

fibers = []
counter = 0

loop do
  fibers << Fiber.new do
    loop do
      Fiber.yield
    end
  end

  fibers.each do |fiber|
    fiber.resume
    fibers.delete(fiber)
  end

  counter += 1
  puts "ends of loop ##{counter}"
end

The previous snippet is causing a segmentation fault using the last compiled version of mrbuy (commit: c45ed46) on Linux (Ubuntu 16.04) and MacOS (10.11.6)

...
ends of loop #1310
ends of loop #1311
ends of loop #1312
ends of loop #1313
ends of loop #1314
ends of loop #1315
ends of loop #1316
ends of loop #1317
ends of loop #1318
ends of loop #1319
ends of loop #1320
ends of loop #1321
ends of loop #1322
ends of loop #1323
[1]    12903 segmentation fault (core dumped)  bin/mruby ../failure.rb

but is working fine (without any segmentation fault) using mruby 1.2.0 (version tagged as 1.2.0)

It's also working disabling the garbage collector, with the following code:

GC.disable

fibers = []
counter = 0

loop do
  fibers << Fiber.new do
    loop do
      Fiber.yield
    end
  end

  fibers.each do |fiber|
    fiber.resume
    fibers.delete(fiber)
  end

  counter += 1
  puts "ends of loop ##{counter}"
end

I think is a garbage collector problem. I would like to know what is causing this, and if is possible to know how to fix it.

@matz matz closed this as completed in 9a12627 Oct 28, 2016
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