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diff --git a/sys/dev/hwpmc/hwpmc_x86.c b/sys/dev/hwpmc/hwpmc_x86.c
--- a/sys/dev/hwpmc/hwpmc_x86.c
+++ b/sys/dev/hwpmc/hwpmc_x86.c
@@ -107,7 +107,8 @@
return (n);
for (; n < nframes;) {
- if (pc == 0 || !PMC_IN_USERSPACE(pc))
+ /* fp == 0 is the ABI frame-chain sentinel below _start. */
+ if (pc == 0 || !PMC_IN_USERSPACE(pc) || fp == 0)
break;
*cc++ = pc; n++;

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