stress2: Added a regression test

tools/test/stress2/misc/signal2.sh

@@ -0,0 +1,53 @@
+#!/bin/sh
+
+# Test scenario from:
+# Bug 265889 - sys.kern.basic_signal.trap_signal_test crashes bhyve in i386 VM 
+# Test scenario by: Li-Wen Hsu <lwhsu@FreeBSD.org>
+
+cat > /tmp/signal2.c <<EOF
+#include <stdio.h>
+#include <signal.h>
+
+#include <machine/psl.h>
+#define    SET_TRACE_FLAG(ucp)    (ucp)->uc_mcontext.mc_eflags |= PSL_T
+#define    CLR_TRACE_FLAG(ucp)    (ucp)->uc_mcontext.mc_eflags &= ~PSL_T
+
+static volatile sig_atomic_t trap_signal_fired = 0;
+
+static void
+trap_sig_handler(int signo __unused, siginfo_t *info __unused, void *_ucp)
+{
+	ucontext_t *ucp = _ucp;
+
+	if (trap_signal_fired < 9) {
+		SET_TRACE_FLAG(ucp);
+	} else {
+		CLR_TRACE_FLAG(ucp);
+	}
+	trap_signal_fired++;
+}
+
+int main() {
+	struct sigaction sa = {
+		.sa_sigaction = trap_sig_handler,
+		.sa_flags = SA_SIGINFO,
+	};
+
+	sigemptyset(&sa.sa_mask);
+	sigaction(SIGTRAP, &sa, NULL);
+
+	raise(SIGTRAP);
+
+	printf("test\n");
+}
+EOF
+cc -o /tmp/signal2 -Wall -Wextra -O0 -m32 /tmp/signal2.c || exit 1
+
+/tmp/signal2; s=$?
+for i in `jot 30`; do
+	/tmp/signal2 &
+done > /dev/null
+wait
+
+rm -f /tmp/signal2 /tmp/signal2.c
+exit $s