D60132.diff
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	diff --git a/sys/riscv/include/pcpu.h b/sys/riscv/include/pcpu.h
	--- a/sys/riscv/include/pcpu.h
	+++ b/sys/riscv/include/pcpu.h
	@@ -47,7 +47,8 @@
	uint32_t pc_pending_ipis; /* IPIs pending to this CPU */ \
	uint32_t pc_hart; /* Hart ID */ \
	uint64_t pc_clock; \
	- char __pad[48] /* Pad to factor of PAGE_SIZE */
	+ uintptr_t pc_canary; \
	+ char __pad[40] /* Pad to factor of PAGE_SIZE */

	#ifdef _KERNEL

	diff --git a/sys/riscv/include/proc.h b/sys/riscv/include/proc.h
	--- a/sys/riscv/include/proc.h
	+++ b/sys/riscv/include/proc.h
	@@ -34,6 +34,7 @@
	struct mdthread {
	int md_spinlock_count; /* (k) */
	register_t md_saved_sstatus_ie; /* (k) */
	+ register_t md_canary; /* (k) */
	};

	struct mdproc {
	diff --git a/sys/riscv/riscv/genassym.c b/sys/riscv/riscv/genassym.c
	--- a/sys/riscv/riscv/genassym.c
	+++ b/sys/riscv/riscv/genassym.c
	@@ -75,6 +75,7 @@

	ASSYM(PC_CURPCB, offsetof(struct pcpu, pc_curpcb));
	ASSYM(PC_CURTHREAD, offsetof(struct pcpu, pc_curthread));
	+ASSYM(PC_CANARY, offsetof(struct pcpu, pc_canary));

	ASSYM(TD_PCB, offsetof(struct thread, td_pcb));
	ASSYM(TD_FLAGS, offsetof(struct thread, td_flags));
	@@ -82,6 +83,7 @@
	ASSYM(TD_PROC, offsetof(struct thread, td_proc));
	ASSYM(TD_FRAME, offsetof(struct thread, td_frame));
	ASSYM(TD_MD, offsetof(struct thread, td_md));
	+ASSYM(TD_MD_CANARY, offsetof(struct thread, td_md.md_canary));
	ASSYM(TD_LOCK, offsetof(struct thread, td_lock));

	ASSYM(TF_SIZE, TF_SIZE);