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	kcsan_md_unwind(void)			kcsan_md_unwind(void)
	{			{
	#ifdef DDB			#ifdef DDB
	c_db_sym_t sym;			c_db_sym_t sym;
	db_expr_t offset;			db_expr_t offset;
	const char *symname;			const char *symname;
	#endif			#endif
	struct unwind_state frame;			struct unwind_state frame;
	uintptr_t sp;
	int nsym;			int nsym;

	__asm __volatile("mov %0, sp" : "=&r" (sp));

	frame.sp = sp;
	frame.fp = (uintptr_t)__builtin_frame_address(0);			frame.fp = (uintptr_t)__builtin_frame_address(0);
	frame.pc = (uintptr_t)kcsan_md_unwind;			frame.pc = (uintptr_t)kcsan_md_unwind;
	nsym = 0;			nsym = 0;

	while (1) {			while (1) {
	if (!unwind_frame(curthread, &frame))			if (!unwind_frame(curthread, &frame))
	break;			break;
	if (!INKERNEL((vm_offset_t)frame.pc))			if (!INKERNEL((vm_offset_t)frame.pc))
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