avoid overflow on functionality to print backtrace of safepoint straggler

Author: d-netto

src/safepoint.c

@@ -157,7 +157,7 @@ void jl_gc_wait_for_the_world(jl_ptls_t* gc_all_tls_states, int gc_n_threads)
                     uv_mutex_unlock(&safepoint_lock);
                 }
                 else {
-                    const int64_t timeout = jl_options.timeout_for_safepoint_straggler_s * 1000000000; // convert to nanoseconds
+                    const int64_t timeout = jl_options.timeout_for_safepoint_straggler_s * 1000000000LL; // convert to nanoseconds
                     int ret = 0;
                     uv_mutex_lock(&safepoint_lock);
                     if (!jl_atomic_load_relaxed(&ptls2->gc_state)) {

test/threads_exec.jl

@@ -1644,11 +1644,13 @@ end
     if isnothing(tmp_output_file)
         error("Failed to open file $tmp_output_filename")
     end
-    run(pipeline(`$(Base.julia_cmd()) --threads=4 --timeout-for-safepoint-straggler=1 -e $program`, stderr=tmp_output_file))
-    # Check whether we printed the straggler's backtrace
-    @test !isempty(read(tmp_output_filename, String))
-    close(tmp_output_file)
-    rm(tmp_output_filename)
+    for timeout in (1, 8, 64)
+        run(pipeline(`$(Base.julia_cmd()) --threads=4 --timeout-for-safepoint-straggler=$(timeout) -e $program`, stderr=tmp_output_file))
+        # Check whether we printed the straggler's backtrace
+        @test !isempty(read(tmp_output_filename, String))
+        close(tmp_output_file)
+        rm(tmp_output_filename)
+    end
 end
 
 end # main testset