[ruby-core:90676] [Ruby trunk Bug#15430][Assigned] test_fork_while_parent_locked is failing status on Ruby CI

Issue #15430 has been updated by k0kubun (Takashi Kokubun).

Status changed from Closed to Assigned

As of r66497 or r66498, some Linux environments are getting:

~~~
  1) Failure:
TestThread#test_fork_while_parent_locked [/home/hsbt/chkbuild/tmp/build/20181222T213003Z/ruby/test/ruby/test_thread.rb:1278]:
lower `nr' if SIGKILL because of RLIMIT_NPROC limit.
Expected "#<Process::Status: pid 17656 SIGKILL (signal 9)>" to be empty.
~~~

https://rubyci.org/logs/rubyci.s3.amazonaws.com/debian8/ruby-trunk/log/20181222T213003Z.fail.html.gz
https://rubyci.org/logs/rubyci.s3.amazonaws.com/centos7/ruby-trunk/log/20181222T230003Z.fail.html.gz
https://rubyci.org/logs/rubyci.s3.amazonaws.com/arch/ruby-trunk/log/20181222T210001Z.fail.html.gz

So reopening this. If it's just a bad check, please consider eliminating the check or skipping the test itself to avoid false-positive alarms.

> Btw, can we get dmesg or kernel logs from those CI machines to confirm it was OOM killer?

I don't have the access to most of RubyCI servers. Please contact @hsbt, @naruse, or possibly @akr about those servers.

----------------------------------------
Bug #15430: test_fork_while_parent_locked is failing status on Ruby CI
https://bugs.ruby-lang.org/issues/15430#change-75847

* Author: hsbt (Hiroshi SHIBATA)
* Status: Assigned
* Priority: Normal
* Assignee: normalperson (Eric Wong)
* Target version: 
* ruby -v: 
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
After r66230, TestThread#test_fork_while_parent_locked is failing status on Ruby CI.

See

* CentOS 7 https://rubyci.org/logs/rubyci.s3.amazonaws.com/centos7/ruby-trunk/log/20181217T230002Z.fail.html.gz
* Amazon Lunux 2 https://rubyci.org/logs/rubyci.s3.amazonaws.com/amazon2/ruby-trunk/log/20181218T003003Z.fail.html.gz
* Arch Linux https://rubyci.org/logs/rubyci.s3.amazonaws.com/arch/ruby-trunk/log/20181218T000002Z.fail.html.gz





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