D54326.id.diff
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D54326.id.diff
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	diff --git a/sys/kern/kern_syscalls.c b/sys/kern/kern_syscalls.c
	--- a/sys/kern/kern_syscalls.c
	+++ b/sys/kern/kern_syscalls.c
	@@ -161,8 +161,14 @@
	{
	struct sysent *se;

	- if (offset == 0)
	- return (0); /* XXX? */
	+ if (offset == 0) {
	+ /*
	+ * Syscall #0 is reserved and is not dynamically registered.
	+ * Treat deregistration as a no-op to simplify module unload
	+ * paths.
	+ */
	+ return (0);
	+ }

	se = &sysents[offset];
	if ((se->sy_thrcnt & SY_THR_STATIC) != 0)