tombstoned: don't generate tombstones for native backtraces.
Previously, if an intercept ends before we ask for a file descriptor
when doing a backtrace, we'll create a tombstone file instead.
Bug: http://b/114139908
Bug: http://b/115349586
Test: debuggerd_test32
Change-Id: I23c7bb8ae5a982a4374a862d0a4f17bee03eb1d9
diff --git a/debuggerd/debuggerd_test.cpp b/debuggerd/debuggerd_test.cpp
index 388facb..bea8b43 100644
--- a/debuggerd/debuggerd_test.cpp
+++ b/debuggerd/debuggerd_test.cpp
@@ -37,6 +37,7 @@
#include <android-base/macros.h>
#include <android-base/parseint.h>
#include <android-base/properties.h>
+#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <android-base/test_utils.h>
#include <android-base/unique_fd.h>
@@ -1053,3 +1054,42 @@
ASSERT_TRUE(android::base::ReadFully(output_fd.get(), outbuf, sizeof(outbuf)));
ASSERT_STREQ("any", outbuf);
}
+
+TEST(tombstoned, interceptless_backtrace) {
+ // Generate 50 backtraces, and then check to see that we haven't created 50 new tombstones.
+ auto get_tombstone_timestamps = []() -> std::map<int, time_t> {
+ std::map<int, time_t> result;
+ for (int i = 0; i < 99; ++i) {
+ std::string path = android::base::StringPrintf("/data/tombstones/tombstone_%02d", i);
+ struct stat st;
+ if (stat(path.c_str(), &st) == 0) {
+ result[i] = st.st_mtim.tv_sec;
+ }
+ }
+ return result;
+ };
+
+ auto before = get_tombstone_timestamps();
+ for (int i = 0; i < 50; ++i) {
+ raise_debugger_signal(kDebuggerdNativeBacktrace);
+ }
+ auto after = get_tombstone_timestamps();
+
+ int diff = 0;
+ for (int i = 0; i < 99; ++i) {
+ if (after.count(i) == 0) {
+ continue;
+ }
+ if (before.count(i) == 0) {
+ ++diff;
+ continue;
+ }
+ if (before[i] != after[i]) {
+ ++diff;
+ }
+ }
+
+ // We can't be sure that nothing's crash looping in the background.
+ // This should be good enough, though...
+ ASSERT_LT(diff, 10) << "too many new tombstones; is something crashing in the background?";
+}