Seems like gcc 4.9.0 is causing some kernel issues..

[Matthias Klose]

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