Issue #9649 has been updated by Hans de Graaff. File threadsafe-ruby21.txt added I can also reproduce this with ruby 2.1 (note that it may take a couple of test runs of the threadsafe test suite to trigger this). ---------------------------------------- Backport #9649: Segfault running thread_safe torture tests under Ruby 2.0 https://bugs.ruby-lang.org/issues/9649#change-53565 * Author: Charles Nutter * Status: Closed * Priority: Normal * Assignee: ---------------------------------------- We received the following report on the thread_safe project: https://github.com/headius/thread_safe/issues/32 It does not appear that any extension code is involved in the backtrace, so I believe the most likely scenario is that the problem lies in MRI. I have not received any reports of segfaults other than this one. ---Files-------------------------------- threadsafe-ruby21.txt (32.8 KB) -- https://bugs.ruby-lang.org/