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diff --git a/sys/dev/hwpmc/hwpmc_mod.c b/sys/dev/hwpmc/hwpmc_mod.c
--- a/sys/dev/hwpmc/hwpmc_mod.c
+++ b/sys/dev/hwpmc/hwpmc_mod.c
@@ -4367,6 +4367,12 @@
break;
error = copyout(&pa, arg, sizeof(pa));
+ /*
+ * The caller never learns the ID of an unpublished PMC; do
+ * not leave it (and the row it holds) behind.
+ */
+ if (error != 0)
+ (void)pmc_do_op_pmcrelease(pa.pm_pmcid);
}
break;

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