[Bug 216731] [patch] if_lagg.c: Boot hang due to LOR in lagg initialization

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216731

            Bug ID: 216731
           Summary: [patch] if_lagg.c: Boot hang due to LOR in lagg
                    initialization
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: fbsd at opal.com
          Keywords: patch

Created attachment 179534
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=179534&action=edit
Patch to drop and re-aquire lock

Discussed in freebsd-wireless, here:
https://lists.freebsd.org/pipermail/freebsd-wireless/2016-December/007391.html

FreeBSD 11.0 occasionally hangs during boot due to a LOR between if_lagg.c and
if_re.c.  The attached patch drops one of the locks in if_lagg.c before calling
the lower driver's initialization, then re-acquires the lock after.

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