>Any idea what might cause blocking in down_failed?
It should be easy to get a stack trace using SGI debugger
(http://reality.sgi.com/slurn_engr/). It allows you to generate stack
traces from arbitrary processes. I have to say that having it into the
kernel wouldn't be a so bad idea... (it was GPL'd if I remeber well :).
>BTW I've seen kflushd blocked in wait_on_super once, too.
The down failed may happens if the loop file has holes for example. No
idea yet about wait_on_super deadlock though :).
Andrea Arcangeli
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