2.4.36

 kernel

diff --git a/kernel/signal.c b/kernel/signal.c
index 77371a0..dff04d7 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -409,8 +409,19 @@ static int ignored_signal(int sig, struct task_struct *t)
 static void handle_stop_signal(int sig, struct task_struct *t)
 {
    switch (sig) {
-   case SIGKILL: case SIGCONT:
-      /* Wake up the process if stopped.  */
+   case SIGCONT:
+      /* SIGCONT must not wake a task while it's being traced */
+      if ((t->state == TASK_STOPPED) &&
+          ((t->ptrace & (PT_PTRACED|PT_TRACESYS)) ==
+           (PT_PTRACED|PT_TRACESYS)))
+         return;
+      /* fall through */
+   case SIGKILL:
+      /* Wake up the process if stopped.
+       * Note that if the process is being traced, waking it up
+       * will make it continue before being killed. This may end
+       * up unexpectedly completing whatever syscall is pending.
+       */
       if (t->state == TASK_STOPPED)
          wake_up_process(t);
       t->exit_code = 0;