[issue1418] HAMMER and problem with external drive(s)

["Matthew Dillon \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

Matthew Dillon <dillon@apollo.backplane.com> added the comment:

There needs to be more context.  What's the exact console output leading up to
that debugger entry?  If there were write errors unrelated to the synchronize
cache issue then that could certain cascade into a panic.  If it just dropped
into the debugger on its own it would also have generated a Debugger message or
a panic message indicating why it did it.

I have fairly low confidence regarding USB-connected storage in general.  There
are probably bugs in the USB driver causing these problems.

-Matt

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