Nicolai Stevens writes:
> > Assuming you need the RAID more than you need
> > softdeps, a workaround is to just turn off softdeps.
> 
> I would if I knew for certain it would work.  The
> audit-trail of the PR suggests that it also crashes
> with softdeps disabled.
>
> Is there anything else tunable (sysctl's, etc..) that
> might make this problem less frequent?

Others have had luck with turning off softdeps and patching
sys/uvm/uvm_page.c so that it has:

 uvmexp.reserve_kernel = 128;

instead of:

 uvmexp.reserve_kernel = 5;

Each case is going to be slightly different, based on RAID params, 
etc., but if you're seeing lots of panics, it's probably worth the 
effort to try it.

Later...

Greg Oster