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diff --git a/sys/arm64/arm64/unwind.c b/sys/arm64/arm64/unwind.c
--- a/sys/arm64/arm64/unwind.c
+++ b/sys/arm64/arm64/unwind.c
@@ -41,7 +41,8 @@
fp = frame->fp;
- if (!kstack_contains(td, fp, sizeof(uintptr_t) * 2))
+ if (!__is_aligned(fp, sizeof(fp)) ||
+ !kstack_contains(td, fp, sizeof(fp) * 2))
return (false);
/* FP to previous frame (X29) */
diff --git a/sys/riscv/riscv/unwind.c b/sys/riscv/riscv/unwind.c
--- a/sys/riscv/riscv/unwind.c
+++ b/sys/riscv/riscv/unwind.c
@@ -47,7 +47,8 @@
fp = frame->fp;
- if (!kstack_contains(td, fp - sizeof(fp) * 2, sizeof(fp) * 2))
+ if (!__is_aligned(fp, sizeof(fp)) ||
+ !kstack_contains(td, fp - sizeof(fp) * 2, sizeof(fp) * 2))
return (false);
frame->sp = fp;

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