2 files changed, 11 insertions, 1 deletions
diff --git a/cont.c b/cont.c
index 6e8f95de54..f0b8a8a0a8 100644
--- a/cont.c
+++ b/cont.c
@@ -240,7 +240,17 @@ static inline void
 ec_switch(rb_thread_t *th, rb_fiber_t *fib)
 {
     rb_execution_context_t *ec = &fib->cont.saved_ec;
+
     ruby_current_execution_context_ptr = th->ec = ec;
+
+    /*
+     * timer-thread may set trap interrupt on previous th->ec at any time;
+     * ensure we do not delay (or lose) the trap interrupt handling.
+     */
+    if (th->vm->main_thread == th && rb_signal_buff_size() > 0) {
+        RUBY_VM_SET_TRAP_INTERRUPT(ec);
+    }
+
     VM_ASSERT(ec->fiber_ptr->cont.self == 0 || ec->vm_stack != NULL);
 }
 
diff --git a/version.h b/version.h
index ef604ffdbf..1f6410e70f 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.5.2"
 #define RUBY_RELEASE_DATE "2018-10-11"
-#define RUBY_PATCHLEVEL 99
+#define RUBY_PATCHLEVEL 100
 
 #define RUBY_RELEASE_YEAR 2018
 #define RUBY_RELEASE_MONTH 10