From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Miles Lane <miles.lane@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.36-git11 -- kernel/pid.c:419 invoked rcu_dereference_check() without protection!
Date: Mon, 8 Nov 2010 13:08:41 -0800 [thread overview]
Message-ID: <20101108210841.GK4032@linux.vnet.ibm.com> (raw)
In-Reply-To: <AANLkTikuOr_MygyDZdmxZaEkRoF8L6tL5Ks5a5w=SMM1@mail.gmail.com>
On Mon, Nov 08, 2010 at 04:00:51PM -0500, Miles Lane wrote:
> Great! Works here. :-)
Thank you for testing it, Miles!
Thanx, Paul
> On Sun, Nov 7, 2010 at 1:47 PM, Paul E. McKenney
> <paulmck@linux.vnet.ibm.com> wrote:
> > On Fri, Oct 29, 2010 at 01:22:28AM -0400, Miles Lane wrote:
> >> [ INFO: suspicious rcu_dereference_check() usage. ]
> >> ---------------------------------------------------
> >> kernel/pid.c:419 invoked rcu_dereference_check() without protection!
> >>
> >> other info that might help us debug this:
> >>
> >>
> >> rcu_scheduler_active = 1, debug_locks = 1
> >> 1 lock held by ureadahead/943:
> >> #0: (tasklist_lock){.+.+..}, at: [<ffffffff810ec497>]
> >> sys_ioprio_set+0x8e/0x2aa
> >>
> >> stack backtrace:
> >> Pid: 943, comm: ureadahead Not tainted 2.6.36-git11 #8
> >> Call Trace:
> >> [<ffffffff8105d335>] lockdep_rcu_dereference+0x9d/0xa5
> >> [<ffffffff8104c825>] find_task_by_pid_ns+0x3f/0x58
> >> [<ffffffff8104c85b>] find_task_by_vpid+0x1d/0x1f
> >> [<ffffffff810ec4c6>] sys_ioprio_set+0xbd/0x2aa
> >> [<ffffffff813547a3>] ? trace_hardirqs_on_thunk+0x3a/0x3f
> >> [<ffffffff81002aab>] system_call_fastpath+0x16/0x1b
> >
> > Could you please try the patch from Sergey Senozhatsky, currently
> > in -mm, that may be found at http://lkml.org/lkml/2010/10/29/168?
> >
> > Thanx, Paul
> >
prev parent reply other threads:[~2010-11-08 21:08 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-29 5:22 2.6.36-git11 -- kernel/pid.c:419 invoked rcu_dereference_check() without protection! Miles Lane
2010-11-07 18:47 ` Paul E. McKenney
2010-11-08 21:00 ` Miles Lane
2010-11-08 21:08 ` Paul E. McKenney [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20101108210841.GK4032@linux.vnet.ibm.com \
--to=paulmck@linux.vnet.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=miles.lane@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.