On 07/18/2014 08:55 AM, Paul E. McKenney wrote: > On Fri, Jul 18, 2014 at 07:17:17AM -0400, Sasha Levin wrote: >> > On 07/14/2014 06:06 AM, Paul E. McKenney wrote: >>> > > From: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx> >>> > > >>> > > RCU currently uses for_each_possible_cpu() to spawn rcuo kthreads, >>> > > which can result in more rcuo kthreads than one would expect, for >>> > > example, derRichard reported 64 CPUs worth of rcuo kthreads on an >>> > > 8-CPU image. This commit therefore creates rcuo kthreads only for >>> > > those CPUs that actually come online. >>> > > >>> > > Reported-by: derRichard >>> > > Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> >> > >> > Hey Paul, >> > >> > Me again. :) >> > >> > It seems that this patch moved thread initialization to a point way >> > too early during boot, before rest_init() which initializes kthreadd_task >> > runs, so creating a new kthread triggers a NULL ptr deref: > This should be fixed by commit 918179699e4a in -rcu. My guess is that > you are instead using commit c6e2955266d14, which, said to say, made it > into -next yesterday. :-( > > If my guess is wrong, please let me know! Your guess is correct. I'll wait for the next -next tree and retry. Thanks, Sasha -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
