WWW in Editor causes Hard Lock

I'm getting an issue every couple of hours.

If I'm in the Editor and I press play, approximately 1% of the time (maybe less, it's very rare) I get an infinite loop freeze.

There errors reported are:

pthread_getschedparam(thread, &policy, &param)
UnityEngine.WWW:.ctor(String)

and

m_DefaultPriority == 0
UnityEngine.WWW:.ctor

I am loading a number of textures using coroutines in parralel. I can't seem to find an instigator, as it happens on player start(within the first couple frames of intialization) on random occasions.

I catch errors in the WWW class, however it does not reach those.

I'm curious if this is a bug or if I could be doing something incorrect with the WWW class. I can't see the internals and I can't really debug what those errors could mean the issue is (I don't touch threadPriority).

Curious if anyone at Unity could give me a push in the right direction.

 

Update: It seems to be more prone to crashing when stopped and started quickly.

 

Apologies for necrothreading, but I have almost the same effect, for almost the same reasons in unity 4.5 on a mac. It seems like the www class is to blame, but I can't catch any errors, it seems very random.
For me, it is coupled with:

!m_Running && "Thread shouldn't be running anymore"