Messages in this thread | | | Date | Wed, 19 Mar 2014 16:47:05 +0100 | From | Peter Zijlstra <> | Subject | Re: Tasks stuck in futex code (in 3.14-rc6) |
| |
On Wed, Mar 19, 2014 at 08:56:19PM +0530, Srikar Dronamraju wrote: > There are 332 tasks all stuck in futex_wait_queue_me(). > I am able to reproduce this consistently. > > Infact I can reproduce this if the java_constraint is either node, socket, system. > However I am not able to reproduce if java_constraint is set to core.
What's any of that mean?
> I ran git bisect between v3.12 and v3.14-rc6 and found that > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b0c29f79ecea0b6fbcefc999e70f2843ae8306db > > commit b0c29f79ecea0b6fbcefc999e70f2843ae8306db > Author: Davidlohr Bueso <davidlohr@hp.com> > Date: Sun Jan 12 15:31:25 2014 -0800 > > futexes: Avoid taking the hb->lock if there's nothing to wake up > > was the commit thats causing the threads to be stuck in futex. > > I reverted b0c29f79ecea0b6fbcefc999e70f2843ae8306db on top of v3.14-rc6 and confirmed that > reverting the commit solved the problem.
Joy,.. let me look at that with ppc in mind.
| |