1 files changed, 6 insertions, 2 deletions

diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c
index 77835bc021c7..093f2ea5dd56 100644
--- a/arch/x86/kernel/stacktrace.c
+++ b/arch/x86/kernel/stacktrace.c
@@ -102,7 +102,7 @@ __save_stack_trace_reliable(struct stack_trace *trace,
         for (unwind_start(&state, task, NULL, NULL); !unwind_done(&state);
              unwind_next_frame(&state)) {
 
-                regs = unwind_get_entry_regs(&state);
+                regs = unwind_get_entry_regs(&state, NULL);
                 if (regs) {
                         /*
                          * Kernel mode registers on the stack indicate an
@@ -164,8 +164,12 @@ int save_stack_trace_tsk_reliable(struct task_struct *tsk,
 {
         int ret;
 
+        /*
+         * If the task doesn't have a stack (e.g., a zombie), the stack is
+         * "reliably" empty.
+         */
         if (!try_get_task_stack(tsk))
-                return -EINVAL;
+                return 0;
 
         ret = __save_stack_trace_reliable(trace, tsk);