Fix SDR race condition with a coarse lock. Does not address multiaccess DB races. Bug 169296.
Fix SDR race condition with a coarse lock. Does not address multiaccess DB
races. Bug 169296.

nmav/nss,ekr/nss-old,ekr/nss-old,nmav/nss,nmav/nss,nmav/nss,ekr/nss-old,ekr/nss-old,nmav/nss,ekr/nss-old,ekr/nss-old,ekr/nss-old,nmav/nss,nmav/nss