debuggerd: tombstone: suppress logger request for logd process

(cherry pick from 45ae446cab9cfc9b6100d91b1a37c6ad82e0cb99)

Change-Id: I619880342ee6febd1a6cc98d2a4f536120efc1c8

2 files changed, 13 insertions, 1 deletions

diff --git a/debuggerd/tombstone.cpp b/debuggerd/tombstone.cpp
index e447190..df982a9 100644
--- a/debuggerd/tombstone.cpp
+++ b/debuggerd/tombstone.cpp
@@ -210,6 +210,12 @@ static void dump_thread_info(log_t* log, pid_t pid, pid_t tid) {
       }
     }
   }
+  // Blacklist logd, logd.reader, logd.writer, logd.auditd, logd.control ...
+  static const char logd[] = "logd";
+  if (!strncmp(threadname, logd, sizeof(logd) - 1)
+      && (!threadname[sizeof(logd) - 1] || (threadname[sizeof(logd) - 1] == '.'))) {
+    log->should_retrieve_logcat = false;
+  }
 
   char procnamebuf[1024];
   char* procname = NULL;
@@ -450,6 +456,10 @@ static void dump_log_file(
   bool first = true;
   struct logger_list* logger_list;
 
+  if (!log->should_retrieve_logcat) {
+    return;
+  }
+
   logger_list = android_logger_list_open(
       android_name_to_log_id(filename), O_RDONLY | O_NONBLOCK, tail, pid);
 
diff --git a/debuggerd/utility.h b/debuggerd/utility.h
index 31684ce..82413b8 100644
--- a/debuggerd/utility.h
+++ b/debuggerd/utility.h
@@ -46,9 +46,11 @@ struct log_t{
     pid_t crashed_tid;
     // The tid of the thread we are currently working with.
     pid_t current_tid;
+    // logd daemon crash, can block asking for logcat data, allow suppression.
+    bool should_retrieve_logcat;
 
     log_t()
-        : tfd(-1), amfd(-1), crashed_tid(-1), current_tid(-1) {}
+        : tfd(-1), amfd(-1), crashed_tid(-1), current_tid(-1), should_retrieve_logcat(true) {}
 };
 
 // List of types of logs to simplify the logging decision in _LOG