gp := getg().m.curg

	// Block signals during a fork, so that the child does not run
	// a signal handler before exec if a signal is sent to the process
	// group. See issue #18600.
	gp.m.locks++
	sigsave(&gp.m.sigmask)
	sigblock(false)

	// This function is called before fork in syscall package.
	// Code between fork and exec must not allocate memory nor even try to grow stack.

	// on binaries that we are going to run and then delete.
	// There's no point in doing work on such a binary.
	// Worse, opening the binary for write here makes it
	// essentially impossible to safely fork+exec due to a fundamental
	// incompatibility between ETXTBSY and threads on modern Unix systems.
	// See golang.org/issue/22220.
	// We still call updateBuildID to update a.buildID, which is important