[Bug 248008] i386 system can hang with many processes sleeping on btalloc post base r358097

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248008

--- Comment #6 from Mark Johnston <markj at FreeBSD.org> ---
Created attachment 217173
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=217173&action=edit
keg_drain patch

Here is a lightly-tested patch that will fix the hangs without adding _NOFREE
back, assuming I did not misunderstand the problem.

Rick, if you are interested in verifying that it fixes the bug, please give it
a try.  If you prefer to simply re-add _NOFREE on !UMA_MD_SMALL_ALLOC
platforms, that is ok with me too.  (i.e., feel free to add me to Reviewed
by:).

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