Re: bcache hang on suspend? sometimes?

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On Tue, Aug 06, 2013 at 02:02:24PM -0700, Kent Overstreet wrote:
> On Tue, Aug 06, 2013 at 01:56:50PM -0700, Darrick J. Wong wrote:
> > Ok, I've narrowed it down a little bit --
> > 
> > It's not caused by any of the fixes that went into 3.10.[1-5].  It doesn't seem
> > to be specific to any particular storage bus, controller, disk, or even cache
> > set -- the same bcache'd usb stick will crash my laptop and not crash my test
> > box.  The 4k/512b sector thing was a red herring; you can ignore that.
> 
> Ok, that makes more sense...
> 
> > The test box is a boring old Core2 box; the laptop is an Ivy Bridge.  I'll try
> > to enable more verbose PM debugging to see if I can determine what exactly's
> > going on at sleep time.  (Again, shooting in the dark...)
> 
> I just looked at the code and it appears there was a freezer fix that
> didn't make it into 3.10 and should have. Can you try the
> bcache-for-3.11 branch and see if that fixes it? If so, I'll get that
> patch sent out for stable.

Oddly(!), setting CONFIG_INTEL_MEI=n fixed the suspend problem.  I see that mei
and ahci both wound up mapped to irq 47 on the two failing machines, which
makes me suspicious.

I'll try your branch to see if it fixes it too.

--D

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