include/linux/sched.h |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff -puN include/linux/sched.h~put_task_struct-debug include/linux/sched.h
--- 25/include/linux/sched.h~put_task_struct-debug	2003-06-05 18:50:53.000000000 -0700
+++ 25-akpm/include/linux/sched.h	2003-06-05 18:50:53.000000000 -0700
@@ -457,12 +457,17 @@ struct task_struct {
 
 	unsigned long ptrace_message;
 	siginfo_t *last_siginfo; /* For ptrace use.  */
+	long debug;
 };
 
 extern void __put_task_struct(struct task_struct *tsk);
 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
-#define put_task_struct(tsk) \
-do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
+#define put_task_struct(tsk)					\
+	do {							\
+		BUG_ON((tsk)->debug == 0x6b6b6b6b);		\
+		if (atomic_dec_and_test(&(tsk)->usage))		\
+			__put_task_struct(tsk);			\
+	} while (0)
 
 /*
  * Per process flags

_