Re: [tip:core/rcu] rcu: Remove lockdep annotations from RCU's_notrace() API members

From: Ingo Molnar
Date: Wed Aug 26 2009 - 14:40:30 EST

* Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> wrote:

> On Wed, Aug 26, 2009 at 10:49:38AM +0200, Ingo Molnar wrote:
> >
> > * tip-bot for Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> wrote:
> >
> > > Commit-ID: 06e799764eb7c2e4640888d438c3524d756613e1
> > > Gitweb:
> > > Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
> > > AuthorDate: Tue, 25 Aug 2009 18:53:37 -0700
> > > Committer: Ingo Molnar <mingo@xxxxxxx>
> > > CommitDate: Wed, 26 Aug 2009 09:45:41 +0200
> > >
> > > rcu: Remove lockdep annotations from RCU's _notrace() API members
> >
> > I'm afraid this does not solve the problem either - the attached
> > config crashes too. Does it boot for you? It should boot fine on
> > most 64-bit x86 systems.
> OK, got my hands on a 64-bit x86 system, building. When I did
> "make oldconfig" on the attached config file, I ended up with the
> following diffs. If there is some other command I should use,
> please let me know. Otherwise, will let you know how this goes.

Have you tried it on tip/master + tip/core/rcu? make oldconfig works
fine with that here.

But ... here's something you wont like: just to make sure i sent you
the right config [i made mistakes there in the past] i picked a
64-bit system (a different one from the one that triggered the
crash), built the config with latest tip/master (80c161b, using gcc
4.3.2) plus tip/core/rcu (06e7997) git-merged in:

git checkout -b tmp tip/master
git merge tip/core/rcu

and booted it - and that did not produce any lockups. So you might
not be able to reproduce it :-/ I've re-merged core/rcu into
tip/master, maybe my tests can find another config that reproduces
the crash better. Please disregard this bugreport until i've found
that one.

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