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Bug #19853

closed

Segfault when calling `system` from a non-blocking fiber

Added by rmosolgo (Robert Mosolgo) about 1 year ago. Updated about 1 year ago.

Status:
Closed
Target version:
-
ruby -v:
ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x86_64-darwin22]
[ruby-core:114568]

Description

Hi! I'm trying to improve my Ruby library to support transfer-based fibers (https://github.com/rmosolgo/graphql-ruby/pull/4322). To test parallel I/O, I'm using system("sleep #{duration}"), but this causes a segfault sometimes. I'd love to find a way to keep developing this feature but I'm not sure where to go next.

I have attached a script which replicates the bug and I have attached the full segfault error dump. I encountered this error by running:

ruby fiber_bug.rb 2>out.txt

Does that help debug? Please let me know if I can provide anything else that'd be helpful.


Files

out.txt (121 KB) out.txt Output on my machine when the segfault comes up rmosolgo (Robert Mosolgo), 08/28/2023 04:04 PM
fiber_bug.rb (624 Bytes) fiber_bug.rb Script to replicate this problem rmosolgo (Robert Mosolgo), 08/28/2023 04:05 PM

Updated by ioquatix (Samuel Williams) about 1 year ago

  • Assignee set to ioquatix (Samuel Williams)

Thanks, I'll take a look.

Updated by ioquatix (Samuel Williams) about 1 year ago

I could reproduce the error with the native backends, but not the pure Ruby backend. That means it's a bug with io-event gem. I'll probably move the issue there once I have time to investigate fully.

> IO_EVENT_SELECTOR=Select ./test.rb
Starting...
{"data"=>{"v1"=>0.5, "v2"=>0.5}}
Ended
[:duration, 0.603101918]

Using a native selector fails with a segfault.

Updated by ioquatix (Samuel Williams) about 1 year ago

https://github.com/ruby/ruby/pull/8315 fixes the segfault and turns it into a TypeError.

Updated by ioquatix (Samuel Williams) about 1 year ago

  • Status changed from Open to Closed
  • Backport changed from 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN to 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED

Updated by nagachika (Tomoyuki Chikanaga) about 1 year ago

  • Backport changed from 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED to 3.0: DONTNEED, 3.1: REQUIRED, 3.2: DONE

ruby_3_2 9cd28caa7cc3b0d987db7c1231fe101fb3b27399 merged revision(s) 901b6d9c5025a30b3d7a5ed0a2c00baf9cfb061d.

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