Ruby Issue Tracking System

05/07/2015

04:05 PM Ruby Bug #11040: Mutex can be locked by multiple threads, causing Monitor to sometimes hang

So now that I added a patch for `lib/monitor.rb` I guess this should be assigned to Shugo Maeda (shugo) per https://bugs.ruby-lang.org/projects/ruby/wiki/MaintainersStdlib, could someone do that for me? Or should I make a new issue? jvdp (Jaap van der Plas)

04/09/2015

08:21 PM Ruby Bug #11040: Mutex can be locked by multiple threads, causing Monitor to sometimes hang

I have attached a patch for `Monitor` that should prevent this issue. jvdp (Jaap van der Plas)

04/07/2015

01:58 PM Ruby Bug #11040: Mutex can be locked by multiple threads, causing Monitor to sometimes hang

Aha, it seems that killing the thread releases the mutex lock directly, while the counter is not decreased. Is this something `Monitor` should be able to deal with? jvdp (Jaap van der Plas)

12:41 PM Ruby Bug #11040: Mutex can be locked by multiple threads, causing Monitor to sometimes hang

Attached what I think is the minimal test case. jvdp (Jaap van der Plas)

12:09 PM Ruby Bug #11040: Mutex can be locked by multiple threads, causing Monitor to sometimes hang

I attached a slightly simpler test case. jvdp (Jaap van der Plas)

12:02 PM Ruby Bug #11040 (Closed): Mutex can be locked by multiple threads, causing Monitor to sometimes hang

I have found a case where Monitor sometimes does not release the lock on its mutex where it should, because the internal counter is increased by another thread than the one holding it. From the trace it seems that `Mutex#lock` succeeds w... jvdp (Jaap van der Plas)