linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <547e96e0.d3518c0a.41af.7747@mx.google.com>
Date:	Wed, 3 Dec 2014 02:51:39 -0200
From:	Dâniel Fraga <fragabr@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Tejun Heo <tj@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On Tue, 2 Dec 2014 20:14:52 -0800
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> What is *really* suspicious is a series of "git bisect good" with no
> "bad"s anywhere. Which is exactly what we see at the end of the
> bisect.
> 
> So might I ask you to try starting from this point again (this is why
> the bisect log is so useful - no need to retest the above part, you
> can just mindlessly do that sequence by hand without testing), and
> starting with this commit:
> 
> > # good: [47dfe4037e37b2843055ea3feccf1c335ea23a9c] Merge branch
> > 'for-3.17' of
> > git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup git bisect
> > good 47dfe4037e37b2843055ea3feccf1c335ea23a9c

> Of course, bugs can come in from anywhere, so it *could* be the
> tracing one, and it *could* be the merge commit, but my gut just
> screams that you probably missed one bad kernel, and marked it good.
> And it's really that very first one (ie commit
> 47dfe4037e37b2843055ea3feccf1c335ea23a9c) that contains most of the
> actually suspect code, so I'd really like you to re-test that one a
> lot before you call it "good" again.
> 
> Humor me.
> 
> I added Tejun to the Cc, just because I wanted to give him a heads-up
> that I am tentatively starting to blame him in my dark little mind..

	:)

	I understand Linus. I'll try the 47dfe4037 commit you
suggested harder and I'll return tomorrow.  

-- 
Linux 3.16.0-00409-gb8c0aa4: Shuffling Zombie Juror
http://www.youtube.com/DanielFragaBR
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