D19287.id54198.diff
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D19287.id54198.diff
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	Index: sys/kern/kern_kcov.c
	===================================================================
	--- sys/kern/kern_kcov.c
	+++ sys/kern/kern_kcov.c
	@@ -248,11 +248,16 @@
	if (index * 4 + 4 + 1 > info->entries)
	return (false);

	- buf[index * 4 + 1] = type;
	- buf[index * 4 + 2] = arg1;
	- buf[index * 4 + 3] = arg2;
	- buf[index * 4 + 4] = ret;
	- buf[0] = index + 1;
	+ while (1) {
	+ buf[index * 4 + 1] = type;
	+ buf[index * 4 + 2] = arg1;
	+ buf[index * 4 + 3] = arg2;
	+ buf[index * 4 + 4] = ret;
	+
	+ if (atomic_cmpset_64(&buf[0], index, index + 1))
	+ break;
	+ buf[0] = index;
	+ }

	return (true);
	}