Add more debug output to crash site.

Where is it being called from?

1 files changed, 9 insertions, 2 deletions

diff --git a/kernel/sched_gsn_edf.c b/kernel/sched_gsn_edf.c
index 3f74296784..fc05daf114 100644
--- a/kernel/sched_gsn_edf.c
+++ b/kernel/sched_gsn_edf.c
@@ -198,7 +198,12 @@ static noinline void unlink(struct task_struct* t)
 {
         cpu_entry_t *entry;
 
-        BUG_ON(!t);
+        if (unlikely(!t)) {
+                TRACE_BUG_ON(!t);
+                TRACE("called from: %p (%p)\n", __builtin_return_address(0),
+                      __builtin_return_address(1));
+                return;
+        }
 
         if (t->rt_param.linked_on != NO_CPU) {
                 /* unlink */
@@ -375,8 +380,10 @@ static reschedule_check_t gsnedf_scheduler_tick(void)
 }
 
 /* caller holds gsnedf_lock */
-static void job_completion(struct task_struct *t)
+static noinline void job_completion(struct task_struct *t)
 {
+        BUG_ON(!t);
+
         sched_trace_job_completion(t);
 
         TRACE_TASK(t, "job_completion().\n");