From: Dave Jones <davej@redhat.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Richard Guy Briggs <rgb@redhat.com>,
Eric Paris <eparis@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Oleg Nesterov <oleg@redhat.com>,
Paul McKenney <paulmck@linux.vnet.ibm.com>
Subject: Re: [PATCH] context_tracking: Restore previous state in schedule_user
Date: Wed, 3 Dec 2014 19:30:24 -0500 [thread overview]
Message-ID: <20141204003024.GA17665@redhat.com> (raw)
In-Reply-To: <CALCETrXbEheevmNKsuEd0NEpCrDz06W5z_OphMOUHqT7qNUTyA@mail.gmail.com>
On Wed, Dec 03, 2014 at 04:04:31PM -0800, Andy Lutomirski wrote:
> On Wed, Dec 3, 2014 at 3:58 PM, Frederic Weisbecker <fweisbec@gmail.com> wrote:
> > On Wed, Dec 03, 2014 at 03:18:41PM -0800, Andy Lutomirski wrote:
> >> It appears that some SCHEDULE_USER (asm for schedule_user) callers
> >> in arch/x86/kernel/entry_64.S are called from RCU kernel context,
> >> and schedule_user will return in RCU user context. This causes RCU
> >> warnings and possible failures.
> >>
> >> This is intended to be a minimal fix suitable for 3.18.
> >>
> >> Reported-by: Dave Jones <davej@redhat.com>
> >> Cc: Oleg Nesterov <oleg@redhat.com>
> >> Cc: Frédéric Weisbecker <fweisbec@gmail.com>
> >> Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
> >> Signed-off-by: Andy Lutomirski <luto@amacapital.net>
> >
> > Ah, we sent it about at the same time :-)
> >
> > Might be too late for 3.18 though because it's not a regression.
Wait, so how come that trace didn't start showing up until recently ?
Dave
next prev parent reply other threads:[~2014-12-04 0:30 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-03 18:19 audit: rcu_read_lock() used illegally while idle Dave Jones
2014-12-03 19:29 ` Paul E. McKenney
2014-12-03 20:06 ` Andy Lutomirski
2014-12-03 20:19 ` Dave Jones
2014-12-03 20:38 ` Andy Lutomirski
2014-12-03 22:08 ` Frederic Weisbecker
2014-12-03 22:12 ` Andy Lutomirski
2014-12-03 23:49 ` Frederic Weisbecker
2014-12-03 23:18 ` [PATCH] context_tracking: Restore previous state in schedule_user Andy Lutomirski
2014-12-03 23:26 ` Andy Lutomirski
2014-12-03 23:31 ` Dave Jones
2014-12-03 23:58 ` Frederic Weisbecker
2014-12-04 0:04 ` Andy Lutomirski
2014-12-04 0:30 ` Dave Jones [this message]
2014-12-04 0:38 ` Andy Lutomirski
2014-12-04 1:13 ` Frederic Weisbecker
2014-12-03 23:37 ` [PATCH v2] " Andy Lutomirski
2014-12-03 23:50 ` Paul E. McKenney
2014-12-04 0:01 ` Frederic Weisbecker
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