fix build hangs

internal/os.c

@@ -1,4 +1,5 @@
 #include "cell.h"
+#include "cell_internal.h"
 
 #include <sys/stat.h>
 #include <sys/types.h>
@@ -306,7 +307,18 @@ static JSValue js_os_rusage(JSContext *js, JSValue self, int argc, JSValue *argv
 
 JSC_SCALL(os_system,
   int err = system(str);
-  ret = number2js(js,err);
+  /* Reset actor turn timer after blocking system() call.
+     The scheduler's kill timer may have fired while system() blocked,
+     setting pause_flag = 2.  Bump turn_gen so stale timer events are
+     ignored, and clear the pause flag so the VM doesn't raise
+     "interrupted" on the next backward branch. */
+  cell_rt *crt = JS_GetContextOpaque(js);
+  if (crt) {
+    atomic_fetch_add_explicit(&crt->turn_gen, 1, memory_order_relaxed);
+    JS_SetPauseFlag(js, 0);
+    crt->turn_start_ns = cell_ns();
+  }
+  ret = number2js(js, err);
 )
 
 JSC_CCALL(os_exit,