More coverage in backtrace.c

src/common/backtrace.c

@@ -109,8 +109,10 @@ log_backtrace(int severity, int domain, const char *msg)
 
   tor_log(severity, domain, "%s. Stack trace:", msg);
   if (!symbols) {
+    /* LCOV_EXCL_START -- we can't provoke this. */
     tor_log(severity, domain, "    Unable to generate backtrace.");
     goto done;
+    /* LCOV_EXCL_STOP */
   }
   for (i=0; i < depth; ++i) {
     tor_log(severity, domain, "    %s", symbols[i]);
@@ -173,8 +175,10 @@ install_bt_handler(void)
 
   for (i = 0; trap_signals[i] >= 0; ++i) {
     if (sigaction(trap_signals[i], &sa, NULL) == -1) {
+      /* LCOV_EXCL_START */
       log_warn(LD_BUG, "Sigaction failed: %s", strerror(errno));
       rv = -1;
+      /* LCOV_EXCL_STOP */
     }
   }
 

src/test/test_bt.sh

@@ -8,4 +8,6 @@ export ASAN_OPTIONS="handle_segv=0:allow_user_segv_handler=1"
 "${builddir:-.}/src/test/test-bt-cl" assert 2>&1 | "${PYTHON:-python}" "${abs_top_srcdir:-.}/src/test/bt_test.py" || exitcode="$?"
 "${builddir:-.}/src/test/test-bt-cl" crash  2>&1 | "${PYTHON:-python}" "${abs_top_srcdir:-.}/src/test/bt_test.py" || exitcode="$?"
 
+"${builddir:-.}/src/test/test-bt-cl" none || exitcode="$?"
+
 exit ${exitcode}