[Bug 252375] kernel panic during reboot "softdep_waitidle: work added after flush"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252375

--- Comment #2 from Kirk McKusick <mckusick at FreeBSD.org> ---
(In reply to Konstantin Belousov from comment #1)

I concur with your analysis. The unlocking can allow other operations to happen
which could cause new work to show up. My take would be to just delete the
KASSERT and let the function loop again. In theory the change could happen more
than SU_WAITIDLE_RETRIES (20) times, but even in that scenario softdep_waitidle
will simply return EBUSY which can be handled at a higher level. Alternatively
we could test for this condition and decrement the loop variable to give it an
extra run around the loop, but that seems to be over-thinking the problem.

Do you agree with this assessment?

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