Excerpts from David Sterba's message of 2011-02-18 12:43:15 -0500:

[ great analysis, thanks so much ]

> 
> Could be, that any of the devices from 'head' list does not satisfy condition
> on line 619, but it cannot be the first device, as !latest_transid would
> work. There is only one device, /dev/sdb, latest_bdev is set and later on
> set on line 660.
> 
> /me sees no more options
> 
> Meanwhile I've tried it myself and the error does not happen here, with
> head at 795abaf1e4e185 (.38-rc4-178-g795abaf). I'll try it with latest -rc5.
> 
> > > [  605.110089] PGD 277d70067 PUD 277e0a067 PMD 0 
> > > [  605.110247] Oops: 0000 [#1] SMP 

Are there any more kernel messages involved before the oops starts?  It
really feels like we're failing to open the block device somehow inside
the btrfs scanning code.

-chris
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