Change how we report EAGAINs during UFFD serving

packages/orchestrator/internal/sandbox/uffd/serve.go

@@ -95,7 +95,7 @@ outerLoop:
 		buf := make([]byte, unsafe.Sizeof(userfaultfd.UffdMsg{}))
 
 		for {
-			n, err := syscall.Read(uffd, buf)
+			_, err := syscall.Read(uffd, buf)
 			if err == syscall.EINTR {
 				logger.Debug("uffd: interrupted read, reading again")
 
@@ -108,8 +108,6 @@ outerLoop:
 			}
 
 			if err == syscall.EAGAIN {
-				logger.Debug("uffd: eagain error, going back to polling", zap.Error(err), zap.Int("read_bytes", n))
-
 				// Continue polling the fd.
 				continue outerLoop
 			}