Consider handling Queue Mutex PoisonErrors

[koenw]

These can only occur if the thread holding the lock crashes, which should ofc not happen but if it happens the application would just deadlock for eternity which is not very helpful. Since properly recovering from such an error can be complex and difficult (like making sure the crashed process is really not around anymore) I think even just printing a message that the look has been poisoned and the application is now hanging would already greatly benefit some future person troubleshooting this potential hang.