linux-kernel - Re: 2.6.27-rc4: lots of 'in_atomic():1, irqs

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Message-ID: <20080829074739.GN20055@kernel.dk>
Date:	Fri, 29 Aug 2008 09:47:39 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Neil Brown <neilb@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, jurriaan <thunder7@...all.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.27-rc4: lots of 'in_atomic():1, irqs_disabled():0' with   software-raid1

On Fri, Aug 29 2008, Neil Brown wrote:
> On Thursday August 28, akpm@...ux-foundation.org wrote:
> > 
> > I'm curious about how this happened.
> > 
> > afaict from reading the code, this:
> > 
> > 	rcu_read_lock();
> > 	might_sleep();
> > 	rcu_read_unlock();
> > 
> > will warn if CONFIG_PREEMPT_RCU=n but won't warn if
> > CONFIG_PREEMPT_RCU=y.  If correct, that's a nasty trap.
> > 
> > Is that what you did?
> 
> Uhm..
> $ grep PREEMPT /home/src/md-x86-64/.config
> CONFIG_PREEMPT_NONE=y
> # CONFIG_PREEMPT_VOLUNTARY is not set
> # CONFIG_PREEMPT is not set
> $ grep DEBUG_SPIN /home/src/md-x86-64/.config
> CONFIG_DEBUG_SPINLOCK=y
> CONFIG_DEBUG_SPINLOCK_SLEEP=y
> $ grep RCU /home/src/md-x86-64/.config
> CONFIG_CLASSIC_RCU=y
> # CONFIG_RCU_TORTURE_TEST is not set
> 
> This definitely doesn't report an error if I put "might_sleep" inside 
> rcu_read_lock.  I tried to figure out why but got lost.

:/

> BTW, I need the following to get current -git to compile.
> 
> NeilBrown
> 
> Author: NeilBrown <neilb@...e.de>
> Date:   Tue Aug 19 11:59:37 2008 +1000
> 
>     Fix compile error in security
> 
> diff --git a/include/linux/security.h b/include/linux/security.h
> index 2ee5ecf..0cc23a1 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -1757,7 +1757,7 @@ static inline int security_ptrace_may_access(struct task_struct *child,
>  
>  static inline int security_ptrace_traceme(struct task_struct *child)
>  {
> -	return cap_ptrace_traceme(parent);
> +	return cap_ptrace_traceme(child);
>  }
>  
>  static inline int security_capget(struct task_struct *target,

That has been fixed in the tree for over a week, I think you need to
update :-)

-- 
Jens Axboe

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