linux-kernel - Re: [lockdep] b09be676e0 BUG: unable to handle kernel NULL pointer dereference at 000001f2

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Message-ID: <20171004141555.pu7ibzydvpc52ys3@treble>
Date:   Wed, 4 Oct 2017 09:15:55 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Byungchul Park <byungchul.park@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        LKP <lkp@...org>
Subject: Re: [lockdep] b09be676e0 BUG: unable to handle kernel NULL pointer
 dereference at 000001f2

On Wed, Oct 04, 2017 at 11:20:52AM +0200, Peter Zijlstra wrote:
> On Tue, Oct 03, 2017 at 07:18:24PM +0200, Ingo Molnar wrote:
> > Yes, I'll do that tomorrow. I was always a bit unhappy about cross-release,
> > because it breaks the 'owner task owns the lock' model.
> 
> Still, you can get real deadlocks with completions...
> 
> > Plus I don't think we found that many real bugs with it
> 
> Every bug found is one less bug. It did find a few.

It also found a bunch of unwinder bugs ;-)

-- 
Josh