linux-kernel - Re: 3.5-rc6 printk formatting problem during oom-kill.

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Message-ID: <1341865916.6118.25.camel@joe2Laptop>
Date:	Mon, 09 Jul 2012 13:31:56 -0700
From:	Joe Perches <joe@...ches.com>
To:	Kay Sievers <kay@...y.org>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartmann <greg@...ah.com>
Subject: Re: 3.5-rc6 printk formatting problem during oom-kill.

On Mon, 2012-07-09 at 20:48 +0200, Kay Sievers wrote:
> On Mon, 2012-07-09 at 20:27 +0200, Kay Sievers wrote:
> > On Mon, Jul 9, 2012 at 8:03 PM, Dave Jones <davej@...hat.com> wrote:
> > > I noticed that the format of the oom-killer output seems to have changed, and
> > > now it spews stuff like..
> > >
> > > [49461.758070] lowmem_reserve[]:
> > > [49461.758071]  0
> > > [49461.758071]  2643
> > > [49461.758071]  3878
> > > [49461.758072]  3878
> > > [49461.758072]
> > > [49461.758072] Node 0
> > 
> > > Does the oom-killer code need modifying, or the printk code ?
> > > I know there's been some regressions in this area recently, but this is still
> > > happening on the current tree (8c84bf4166a4698296342841a549bbee03860ac0)
> > 
> > This likely fixes it:
> >   http://git.kernel.org/?p=linux/kernel/git/kay/patches.git;a=blob;f=kmsg-merge-cont.patch;hb=HEAD
> > 
> > Let me check if it does, and if I can reproduce it.
> 
> It looks fine here with the above mentioned patch:
> [    0.000000] lowmem_reserve[]:
> [    0.000000]  0
> [    0.000000]  0
> [    0.000000]  0
> [    0.000000]  0
> [    0.000000] 
> [    0.000000] DMA: 
> [    0.000000] 1*4kB 
> [    0.000000] 0*8kB 
> [    0.000000] 0*16kB 
> [    0.000000] 1*32kB 
> [    0.000000] 2*64kB 
> [    0.000000] 1*128kB 
> [    0.000000] 1*256kB 
> [    0.000000] 0*512kB 
> [    0.000000] 1*1024kB 
> [    0.000000] 1*2048kB 
> [    0.000000] 3*4096kB 
> [    0.000000] = 15908kB
> 
> becomes:
> [    0.000000] lowmem_reserve[]: 0 0 0 0
> [    0.000000] DMA: 1*4kB 0*8kB 0*16kB 1*32kB 2*64kB 1*128kB 1*256kB 0*512kB 1*1024kB 1*2048kB 3*4096kB = 15908kB

Hi Kay.

That single patch doesn't apply cleanly to Linus'
8c84bf4166a4698296342841a549bbee03860ac0

What else is necessary?

Your tree seems to have a collection of random patches.

It might be useful to clone Linus' tree and produce a
branch with all the necessary printk patches in it so
someone else could pull it.

cheers, Joe

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