kern/116913: panic: ffs_blkfree: freeing free block

[Oliver Fromme]

Hello Remko, hello Rolf,

remko at freebsd.org wrote:
 > State-Changed-From-To: open->closed
 > [...]
 > State-Changed-Why: 
 > No longer reproducable (as per the submitter)

I assume that the submitter meant that he can no longer
reproduce it after applying the patch that he mentioned
(for sys/ufs/ffs/ffs_softdep.c).

So I think this PR should stay open until that patch (or
a better one) is comitted.

By the way, I got the same panic on a RELENG_7 machine
two days ago (without the patch).

Best regards
   Oliver

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