Re: timing bug in clone() ?

Helge Deller wrote:
> Help !
> 
> I'm trying to find the reason, why the program below segfaults on parisc.
> if you change the "#if 0" to "#if 1", then it works without segfaulting.
> 
> To me it seems we have some kind of race in the linux kernel, e.g.
> thread exits, wants to notify parent, but parent hasn't returned from clone() call... ?!?
> 
> Any ideas ?

We have some other problems that may be related to this. It might be a
race in how signals are delivered. We hit some problems with multiple
threads that seems somewhat similar.  See thread_test2.c in our
userspace cvs repo. It *might* be the same problem.

Sorry I don't have any ideas what the real problem is. I tried to debug
this a bit but reach any conclusions. It might be because our fork() is
quite slow because of all the cache flushing.

randolph