linux-kernel - Re: Crash in -next due to 'MIPS: Move FP usage checks into protected_{save, restore}_fp

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Message-ID: <20150727194401.GC14674@roeck-us.net>
Date:	Mon, 27 Jul 2015 12:44:01 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Paul Burton <paul.burton@...tec.com>
Cc:	linux-next@...r.kernel.org, Ralf Baechle <ralf@...ux-mips.org>,
	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org
Subject: Re: Crash in -next due to 'MIPS: Move FP usage checks into
 protected_{save, restore}_fp_context'

On Mon, Jul 27, 2015 at 11:04:42AM -0700, Paul Burton wrote:
> On Mon, Jul 27, 2015 at 10:46:22AM -0700, Guenter Roeck wrote:
> > On Mon, Jul 27, 2015 at 10:21:42AM -0700, Paul Burton wrote:
> > > On Mon, Jul 27, 2015 at 08:06:52AM -0700, Guenter Roeck wrote:
> > > > On Wed, Jul 15, 2015 at 09:09:18AM -0700, Guenter Roeck wrote:
> > > > > Hi,
> > > > 
> > > > > my qemu test for mipsel crashes with next-20150715 as follows.
> > > > > 
> > > > ping ... problem is still seen as of next-20150727.
> > > 
> > > Hi Guenter,
> > > 
> > > Apologies for the delay. Could you share your affected kernel
> > > configuration & which userland you're running?
> > > 
> > > I've just tested with a malta_defconfig kernel & a buildroot based
> > > initramfs without problems, and things are also fine on my physical
> > > MIPSr6 setups. If you have any directions with which I can reproduce
> > > this problem that would be great.
> > > 
> > This is with qemu in little endian mode. Big endian works fine.
> 
> Yup, I was using little endian in both cases. malta_defconfig is little
> endian - sadly use of the el suffix is pretty inconsistent...
> 

Hi Paul,

some more data:

I tried with mipsel64, using malta_defconfig from 4.2-rc4 as starting point.
Same failure. All releases from 3.2 up to 4.2-rc4 pass the test, linux-next
as of today fails.

Here is the log:

http://server.roeck-us.net:8010/builders/qemu-mipsel64-next/builds/0/steps/qemubuildcommand/logs/stdio

I pushed the initramfs, configuration, and test script into rootfs/mipsel64
of https://github.com/groeck/linux-build-test.

Guenter
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