Messages in this thread Patch in this message | | | Date | Wed, 27 Jan 1999 01:53:16 +0100 (CET) | From | Andrea Arcangeli <> | Subject | did you seen a process stuck in D state? if so read this (nono it's not the fix ;) |
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If you can reproduce in some way a process that get stuck in D state please apply this my patch:
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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