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    SubjectRe: [PATCH 0/5] [GIT PULL] updates for tip/tracing/ftrace

    * Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:

    > On Thu, Mar 19, 2009 at 01:21:47PM -0400, Steven Rostedt wrote:
    > >
    > > I'm still not able to reproduce, but...
    > >
    > > On Thu, 19 Mar 2009, Ingo Molnar wrote:
    > >
    > > > * Ingo Molnar <mingo@elte.hu> wrote:
    > > >
    > > > > these latest ftrace changes caused a lockup on a -tip testsystem:
    > > >
    > > > Note, even with Rusty's offstack-cpumask fix applied (in latest
    > > > -tip), i can reproduce a lockup:
    > > >
    >
    > [ . . . ]
    >
    > > This looks like it is RCU/stop_machine related. The CPU is stuck in
    > > in stop_machine? I see that rcu_torture is running. Does this go away if
    > > you turn off rcu_torture?
    >
    > Grasping at straws... Does Lai's rcu_barrier() fix help?

    which one is that?

    Ingo


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