Index: sched.c
===================================================================
RCS file: /var/cvs/linux/kernel/sched.c,v
retrieving revision 1.1.1.1.2.37
diff -u -r1.1.1.1.2.37 sched.c
--- sched.c 1999/01/07 11:57:23 1.1.1.1.2.37
+++ sched.c 1999/01/08 10:41:53
@@ -22,6 +22,10 @@
* current-task
*/
+/*
+ * Debug down() code. Copyright (C) 1999 Andrea Arcangeli
+ */
+
#include <linux/mm.h>
#include <linux/kernel_stat.h>
#include <linux/fdreg.h>
@@ -893,12 +897,27 @@
tsk->state = TASK_RUNNING; \
remove_wait_queue(&sem->wait, &wait);
+void generate_oops (struct semaphore *sem)
+{
+ sema_init(sem, 9876);
+ wake_up(&sem->wait);
+}
+
void __down(struct semaphore * sem)
{
DOWN_VAR
+ struct timer_list timer;
+ init_timer (&timer);
+ timer.expires = jiffies + HZ*20;
+ timer.data = (unsigned long) sem;
+ timer.function = (void (*)(unsigned long)) generate_oops;
+ add_timer(&timer);
DOWN_HEAD(TASK_UNINTERRUPTIBLE)
schedule();
+ if (atomic_read(&sem->count) == 9876)
+ *(int *) 0 = 0;
DOWN_TAIL(TASK_UNINTERRUPTIBLE)
+ del_timer(&timer);
}
int __down_interruptible(struct semaphore * sem)
After 20 sec of deadlock you should see an Oops on the screen. Please
filter the oops throught ksymoops and give us the kernel trace of the
deadlocked process.
I just asked this to some guy but I had no reply so far.
Andrea Arcangeli
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