Thanks. Running now in our dev environment, no crash so far.
I would attach a patch that works against the 4.3 branch, but Github won't allow me to attach .patch files (and no .txt neither, because I don't have write access to the repository).

So this is the plain text patch, that works for us:

index 40e89d3..15c0fb3 100644
--- a/modules/dmq_usrloc/usrloc_sync.c
+++ b/modules/dmq_usrloc/usrloc_sync.c
@@ -197,14 +197,14 @@ void usrloc_get_all_ucontact(dmq_node_t* node)
         memcpy( &aorhash, cp, sizeof(aorhash));
         cp = (char*)cp + sizeof(aorhash);

+       r = 0;
+       ptr = 0;
         res = dmq_ul.get_urecord_by_ruid(_d, aorhash, &ruid, &r, &ptr);
-        aor = r->aor;
-        if (res > 0) {
-            LM_DBG("'%.*s' Not found in usrloc\n", aor.len, ZSW(aor.s));
-            dmq_ul.release_urecord(r);
-            dmq_ul.unlock_udomain(_d, &aor);
+       if (res < 0) {
+            LM_DBG("'%.*s' Not found in usrloc\n", ruid.len, ZSW(ruid.s));
             continue;
         }
+        aor = r->aor;
         LM_DBG("- AoR: %.*s  AoRhash=%d  Flags=%d\n", aor.len, aor.s, aorhash, flags);

         while (ptr) {

—
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