[DRE-maint] Bug#1078431: ruby-concurrent: flaky autopkgtest on arm64: Attempt to unlock a mutex which is locked by another thread/fiber

[Paul Gevers]

Source: ruby-concurrent
Version: 1.2.3-2
Severity: serious
User: debian-ci at lists.debian.org
Usertags: flaky

Dear maintainer(s),

I looked at the results of the autopkgtest of your package because it 
was blocking migration of gcc-14. I noticed that it regularly fails (I 
tested on arm64: 3/10).

Because the unstable-to-testing migration software now blocks on
regressions in testing, flaky tests, i.e. tests that flip between
passing and failing without changes to the list of installed packages,
are causing people unrelated to your package to spend time on these
tests.

Don't hesitate to reach out if you need help and some more information
from our infrastructure.

Paul

https://ci.debian.net/packages/r/ruby-concurrent/testing/arm64/50327775/

413s      5.2) Failure/Error: subject.put(:foo)
413s
413s           ThreadError:
413s             Attempt to unlock a mutex which is locked by another 
thread/fiber
413s           # 
/usr/share/rubygems-integration/all/gems/rspec-support-3.13.1/lib/rspec/support/reentrant_mutex.rb:42:in 
`exit'
413s           # 
/usr/share/rubygems-integration/all/gems/rspec-support-3.13.1/lib/rspec/support/reentrant_mutex.rb:27:in 
`synchronize'
413s           # 
/usr/share/rubygems-integration/all/gems/rspec-core-3.13.0/lib/rspec/core/memoized_helpers.rb:178:in 
`block in fetch_or_store'
413s           # org/jruby/RubyHash.java:1441:in `fetch'
413s           # 
/usr/share/rubygems-integration/all/gems/rspec-core-3.13.0/lib/rspec/core/memoized_helpers.rb:177:in 
`fetch_or_store'
413s           # 
/usr/share/rubygems-integration/all/gems/rspec-core-3.13.0/lib/rspec/core/memoized_helpers.rb:343:in 
`block in let'
413s           # 
./spec/concurrent/channel/buffer/unbuffered_spec.rb:239:in `block in Buffer'
413s           # ./spec/support/example_group_extensions.rb:34:in `block 
in in_thread'
413s
413s Finished in 4 minutes 15.7 seconds (files took 8.1 seconds to load)
413s 2941 examples, 5 failures, 11 pending
413s
413s Failed examples:
413s
413s rspec ./spec/concurrent/channel/buffer/unbuffered_spec.rb:235 # 
Concurrent::Channel::Buffer::Unbuffered#next returns Concurrent::NULL, 
false when closed and no items remain
413s rspec ./spec/concurrent/channel/buffer/unbuffered_spec.rb:186 # 
Concurrent::Channel::Buffer::Unbuffered#next blocks when no putting and 
returns <item>, true when one arrives
413s rspec ./spec/concurrent/channel/buffer/unbuffered_spec.rb:205 # 
Concurrent::Channel::Buffer::Unbuffered#next returns <item>, true when 
there are multiple putting
413s rspec ./spec/concurrent/channel/buffer/unbuffered_spec.rb:221 # 
Concurrent::Channel::Buffer::Unbuffered#next returns <item>, true when 
closed and last item
413s rspec ./spec/concurrent/channel/buffer/unbuffered_spec.rb:235 # 
Concurrent::Channel::Buffer::Unbuffered#next returns Concurrent::NULL, 
false when closed and no items remain
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