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

[Guenter Roeck <linux@roeck-us.net>]

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