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This commit also reverts 2 previous attempts to fix this very rare race issue spanning back to 2009 62ce8538974f727778f1024d0ef9549e438704fe Patch from MOC 3a85348cdfd0fd7df63a2a150790722c2d294b36 FS-2302 mutex added around switch_xml_toxml() The real problem was switch_xml_toxml_buf() was actually temporarily modifying the xml structure being searialized to make it appaer to be a root structure then serializing it and restoring the pointers. This caused a non-threadsafe operation when some other thread was scanning the same xml structure. This patch removes the modification and instead passes a new arg to switch_xml_toxml_r indicating to treat the structure as if it were a root structure. This bug has been present since the induction of xml into FS.