rpi/dwc2 kernel panics

[Andre Heider]

On Wed, Feb 12, 2014 at 08:00:18PM -0700, Stephen Warren wrote:
> On 02/12/2014 11:52 AM, Andre Heider wrote:
> > Hi guys,
> > 
> > I just tried today's Linus' master (45f7fdc2ff) with usb-linus (3635c7e2d5)
> > merged on top to give the latest dwc2 fixes another try.
> > Unfortunately I'm getting various crashes on system startup. Kernel boots
> > fine, dwc2 and the integrated smsc95xx are detected, but somewhere in the
> > init sequence the system panics.
> 
> I haven't ever seen crashes like that, when running linux-next. I also
> merged those two exact commits together and didn't see any issue in 10
> boot cycles.

Same thing here with linux-next (Linux rpi 3.14.0-rc2-next-20140213-rpi).
The last traces has systemd in there, but good old sysvinit crashed
spectacular too.

> FWIW, I am running:
> * A rev2 Model B
> * Firmware commit 9c3d7b6 "Add latest linaro gcc toolchain:
> gcc-linaro-arm-linux-gnueabihf-raspbian-2012.08-20120724_linux"
> * Upstream U-Boot (very recent) and kernel
> * Using Ubuntu 13.10's packaged ARM cross-compiler

Huh, switching compilers made a difference...

I was using debian's cross compiler [0], 4.8.2, which has a couple of
patches [1].

With my old self compiled and unpatched toolchains I didn't yet get
any crashes, I tried:
binutils 2.20	+ gcc 4.4.4
binutils 2.21.1	+ gcc 4.4.7
binutils 2.23.1	+ gcc 4.7.1
binutils 2.24	+ gcc 4.7.2

but with these versions (also unpatched) I do get the crashes:
binutils 2.23.2	+ gcc 4.8.1
binutils 2.24	+ gcc 4.8.2

Which one are you using? gcc-arm-linux-gnueabi [2] or
gcc-arm-linux-gnueabihf [3]? Maybe there's a reason the former is 4.7
while the latter is 4.8?
In case you're using 4.7, care to give 4.8 a try?

In any case, I'm hesitant to blame this on a compiler bug since
booting any of those kernels with "nousb" didn't yet end is weird
panics.

Thanks,
Andre

[0] https://packages.debian.org/unstable/gcc-arm-none-eabi
[1] http://anonscm.debian.org/gitweb/?p=collab-maint/gcc-arm-none-eabi.git;a=tree;f=debian/patches
[2] http://packages.ubuntu.com/saucy/devel/gcc-arm-linux-gnueabi
[3] http://packages.ubuntu.com/saucy/devel/gcc-arm-linux-gnueabihf