Merge changes I8b3e8a3b,I4976abef,I31dadb9c

* changes:
  tombstoned: silence spurious error messages.
  Actually don't start tombstoned until /data is mounted.
  debuggerd_handler: add SIGSYS to the list of handled signals.

debuggerd/include/debuggerd/handler.h

@@ -48,6 +48,7 @@ static void __attribute__((__unused__)) debuggerd_register_handlers(struct sigac
 #if defined(SIGSTKFLT)
   sigaction(SIGSTKFLT, action, nullptr);
 #endif
+  sigaction(SIGSYS, action, nullptr);
   sigaction(SIGTRAP, action, nullptr);
   sigaction(DEBUGGER_SIGNAL, action, nullptr);
 }

debuggerd/tombstoned/tombstoned.cpp

@@ -85,7 +85,13 @@ static void find_oldest_tombstone() {
     std::string path = android::base::StringPrintf("%stombstone_%02zu", kTombstoneDirectory, i);
     struct stat st;
     if (stat(path.c_str(), &st) != 0) {
-      PLOG(ERROR) << "failed to stat " << path;
+      if (errno == ENOENT) {
+        oldest_tombstone = i;
+        break;
+      } else {
+        PLOG(ERROR) << "failed to stat " << path;
+        continue;
+      }
     }
 
     if (st.st_mtime < oldest_time) {

debuggerd/tombstoned/tombstoned.rc

@@ -2,6 +2,9 @@ service tombstoned /system/bin/tombstoned
     user tombstoned
     group system
 
+    # Don't start tombstoned until after the real /data is mounted.
+    class late_start
+
     socket tombstoned_crash seqpacket 0666 system system
     socket tombstoned_intercept seqpacket 0666 system system
     writepid /dev/cpuset/system-background/tasks

rootdir/init.rc

@@ -359,9 +359,6 @@ on post-fs-data
     start vold
     installkey /data
 
-    # start tombstoned to record early-boot crashes.
-    start tombstoned
-
     # Start bootcharting as soon as possible after the data partition is
     # mounted to collect more data.
     mkdir /data/bootchart 0755 shell shell