c72db5c8dc
A race in g_part_wither() can lead to I/O being performed with a freed GEOM when the device disappears. Close the race as best as we can for now, following the code patterns from g_part_ctl_destroy() and g_part_ctl_undo(). This also fixes a leak, as g_wither_geom() does not wither providers, it only orphans them, so the partition entries would never get destroyed in g_wither_washer(). Note, this is not a complete fix, it can still race with g_part_start(), the race has merely been narrowed. Reviewed by: markj Sponsored by: Dell EMC Isilon
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