On Mon, Jun 25, 2012 at 08:45:02AM -0600, Stefan Priebe - Profihost AG wrote:

quoted

Thats weird, sysrq+w should have a bunch of stacktraces but it's empty, so
unless theres a bug theres nothing blocked.  Is the box actually hung or is it
just taking forever?  Maybe try sysrq+w again to see if the one you pasted was
just a fluke?  Thanks,

This one looks better:
http://pastebin.com/raw.php?i=R4pztDRt

Ok looks like you have discard turned on.  Can you turn that off and see if you
can still reproduce the deadlock?  If so sysrq+w again, if not then I know where
to look ;).  Thanks,

Josef