Re: bcache hang on suspend? sometimes?

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.