[lldb] [test] Make 2lwp_process_SIGSEGV test more portable

Fix 2lwp_process_SIGSEGV NetBSD core test to terminate inside regular
function rather than libc call, in order to get reproducible backtrace
on different platforms.

Differential Revision: https://reviews.llvm.org/D59177

llvm-svn: 355786

lldb/packages/Python/lldbsuite/test/functionalities/postmortem/netbsd-core/2lwp_process_SIGSEGV.c

@@ -4,9 +4,12 @@
 #include <unistd.h>
 #include <signal.h>
 
+volatile int sem = 0;
+
 static void bar() {
   char F = 'b';
-  kill(getpid(), SIGSEGV); // Frame bar
+  sem = 1;
+  while (1) continue; // Frame bar
 }
 
 static void foo(void (*boomer)()) {
@@ -28,5 +31,7 @@ int main(int argc, char **argv) {
   stack = malloc(ssize);
   _lwp_makecontext(&uc, lwp_main, NULL, NULL, stack, ssize);
   _lwp_create(&uc, 0, &lid);
+  while (sem != 1) continue;
+  kill(getpid(), SIGSEGV);
   _lwp_wait(lid, NULL);
 }

lldb/packages/Python/lldbsuite/test/functionalities/postmortem/netbsd-core/TestNetBSDCore.py

@@ -206,11 +206,10 @@ class NetBSD2LWPProcessSigCoreTestCase(NetBSDCoreCommonTestCase):
         thread = process.GetSelectedThread()
         self.assertTrue(thread)
         self.assertEqual(thread.GetThreadID(), 2)
-        self.assertEqual(thread.GetThreadID(), 2)
         self.assertEqual(thread.GetStopReason(), lldb.eStopReasonSignal)
         self.assertEqual(thread.GetStopReasonDataCount(), 1)
         self.assertEqual(thread.GetStopReasonDataAtIndex(0), signal.SIGSEGV)
-        backtrace = ["_kill", "bar", "foo", "lwp_main"]
+        backtrace = ["bar", "foo", "lwp_main"]
         self.check_backtrace(thread, filename, backtrace)
 
         # thread 1 should have the same signal
@@ -219,8 +218,7 @@ class NetBSD2LWPProcessSigCoreTestCase(NetBSDCoreCommonTestCase):
         self.assertEqual(thread.GetStopReasonDataCount(), 1)
         self.assertEqual(thread.GetStopReasonDataAtIndex(0), signal.SIGSEGV)
 
-    @skipIf  # TODO: fails with non-netbsd libc
     @skipIfLLVMTargetMissing("X86")
     def test_amd64(self):
         """Test double-threaded amd64 core dump where process is signalled."""
-        self.do_test("2lwp_process_SIGSEGV.amd64", pid=141, region_count=24)
+        self.do_test("2lwp_process_SIGSEGV.amd64", pid=665, region_count=24)