Merge pull request #69636 from al45tair/eng/PR-117900760-5.9

[Backtracing][Linux] Handle inaccessible memory properly in Docker.

Author: al45tair

stdlib/public/runtime/CrashHandlerLinux.cpp

@@ -668,7 +668,7 @@ memserver_read(void *to, const void *from, size_t len) {
       memcpy(to, from, len);
       return len;
     } else {
-      return 1;
+      return -1;
     }
   }
 }