Corruption of root fs during git bisect of drm system hang

[Markus Trippelsdorf]

On 2013.07.10 at 19:37 -0500, Stan Hoeppner wrote:
> On 7/10/2013 4:06 AM, Markus Trippelsdorf wrote:
> > While bisecting a system hang, caused by the drm gpu subsystem, my root fs got
> > corrupted:
> ...
> > My root fs lives on a small SSD:
> > 
> > /dev/root on / type xfs (rw,relatime,attr2,inode64,logbsize=256k,noquota)
> > /dev/root      xfs        30G   15G   16G  50% /
> 
> Does your SSD honor barriers and cache flushes?

Yes, I hope so:

  Enabled Supported:
     ...
     *    Mandatory FLUSH_CACHE
     *    FLUSH_CACHE_EXT

But please note that the system hang mentioned above turned out to be a
locking problem. So the SSD had plenty of time to process any out-
standing commands before reboot.

-- 
Markus