D46400.diff
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	diff --git a/sys/riscv/riscv/vm_machdep.c b/sys/riscv/riscv/vm_machdep.c
	--- a/sys/riscv/riscv/vm_machdep.c
	+++ b/sys/riscv/riscv/vm_machdep.c
	@@ -179,6 +179,8 @@
	tf->tf_sp = STACKALIGN((uintptr_t)stack->ss_sp + stack->ss_size);
	tf->tf_sepc = (register_t)entry;
	tf->tf_a[0] = (register_t)arg;
	+ tf->tf_ra = 0; /* Tell unwinders there is no return address. */
	+ tf->tf_s[0] = 0; /* Tell unwinders there is no stack frame above. */
	return (0);
	}