Add stack trace coverage to MTE tests.

It's impractical to test the contents of the stack trace, but we
should at least test that *a* stack trace is present, which would
have caught the bug fixed by r.android.com/1306754 .

Bug: 135772972
Change-Id: Ic5e0b997caa53c7eeec4e5185df5c043c9d4fe3d
diff --git a/debuggerd/debuggerd_test.cpp b/debuggerd/debuggerd_test.cpp
index 25417a9..9d7658e 100644
--- a/debuggerd/debuggerd_test.cpp
+++ b/debuggerd/debuggerd_test.cpp
@@ -379,7 +379,12 @@
   ConsumeFd(std::move(output_fd), &result);
 
   ASSERT_MATCH(result, R"(signal 11 \(SIGSEGV\), code 9 \(SEGV_MTESERR\))");
-  ASSERT_MATCH(result, R"(Cause: \[MTE\]: Use After Free, 0 bytes into a 16-byte allocation)");
+  ASSERT_MATCH(result, R"(Cause: \[MTE\]: Use After Free, 0 bytes into a 16-byte allocation.*
+
+allocated by thread .*
+      #00 pc)");
+  ASSERT_MATCH(result, R"(deallocated by thread .*
+      #00 pc)");
 #else
   GTEST_SKIP() << "Requires aarch64 + ANDROID_EXPERIMENTAL_MTE";
 #endif
@@ -410,7 +415,10 @@
   ConsumeFd(std::move(output_fd), &result);
 
   ASSERT_MATCH(result, R"(signal 11 \(SIGSEGV\))");
-  ASSERT_MATCH(result, R"(Cause: \[MTE\]: Buffer Overflow, 0 bytes right of a 16-byte allocation)");
+  ASSERT_MATCH(result, R"(Cause: \[MTE\]: Buffer Overflow, 0 bytes right of a 16-byte allocation.*
+
+allocated by thread .*
+      #00 pc)");
 #else
   GTEST_SKIP() << "Requires aarch64 + ANDROID_EXPERIMENTAL_MTE";
 #endif
@@ -441,7 +449,10 @@
   ConsumeFd(std::move(output_fd), &result);
 
   ASSERT_MATCH(result, R"(signal 11 \(SIGSEGV\), code 9 \(SEGV_MTESERR\))");
-  ASSERT_MATCH(result, R"(Cause: \[MTE\]: Buffer Underflow, 4 bytes left of a 16-byte allocation)");
+  ASSERT_MATCH(result, R"(Cause: \[MTE\]: Buffer Underflow, 4 bytes left of a 16-byte allocation.*
+
+allocated by thread .*
+      #00 pc)");
 #else
   GTEST_SKIP() << "Requires aarch64 + ANDROID_EXPERIMENTAL_MTE";
 #endif