Seems like gcc 4.9.0 is causing some kernel issues..

[Tim Gardner]

On 07/28/2014 03:16 AM, Matthias Klose wrote:
> Am 28.07.2014 00:08, schrieb Tim Gardner:
>> On 07/27/2014 01:46 PM, Colin Ian King wrote:
>>> FYI
>>>
>>> http://lkml.iu.edu//hypermail/linux/kernel/1407.3/00650.html
>>>
>>
>> Matthias - is this on your radar ?
>
> the full thread in all its glory can be found at
> https://lists.debian.org/debian-gcc/2014/07/msg00165.html too.
>
> Looks like 4.9.1-2 and 4.9.1-2ubuntu1 have the fix, and the thread was only
> started after it was fixed.  But good job on the press coverage.
>
> PR rtl-optimization/61801 was fixed on Jul 17, which should fix the immediate
> issue.  Reading the thread, the particular issue is not seen with -O2 which
> should be the default for Debian/Ubuntu (although I can't verify because the
> kernel build logs are again not in verbose mode).
>
> The other suggestion given in this thread was to use
> -fvar-tracking[-assignments] when using inline asm's.
>
>    Matthias
>

Looks like the archive kernel built last night (linux 3.16.0-6.11) used 
GCC: (Ubuntu 4.8.3-5ubuntu2) 4.8.3 so I guess we're OK regardless.

rtg
-- 
Tim Gardner tim.gardner at canonical.com