> On 12/19/06, Chuck Ebbert <[email protected]> wrote:
> > So an external interrupt occurred, the system tried to use interrupt
> > descriptor #39 decimal (irq 7), but the descriptor was invalid.
>
> but the irq is disabled at that time.
>
> can you use attached diff to verify if the irq is enable somehow?
But it seems interrupts are on--look at the flags:
RSP: 0018:ffffffff803cdf68 EFLAGS: 00010246
--
MBTI: IXTP
On 12/20/06, Chuck Ebbert <[email protected]> wrote:
> But it seems interrupts are on--look at the flags:
>
> RSP: 0018:ffffffff803cdf68 EFLAGS: 00010246
Yes, the IF bit is set.
maybe someone (reporters) could add !irq_disabled() and printk in
start_kernel init/main.c to see which function cause the irq get
enabled.
YH
On Wed, 20 Dec 2006 04:59:19 -0500
Chuck Ebbert <[email protected]> wrote:
> > On 12/19/06, Chuck Ebbert <[email protected]> wrote:
> > > So an external interrupt occurred, the system tried to use interrupt
> > > descriptor #39 decimal (irq 7), but the descriptor was invalid.
> >
> > but the irq is disabled at that time.
> >
> > can you use attached diff to verify if the irq is enable somehow?
>
> But it seems interrupts are on--look at the flags:
>
> RSP: 0018:ffffffff803cdf68 EFLAGS: 00010246
>
down_write()->__down_write()->__down_write_nested()->spin_unlock_irq()->dead
Could someone please test this?
--- a/lib/rwsem-spinlock.c~a
+++ a/lib/rwsem-spinlock.c
@@ -195,13 +195,14 @@ void fastcall __sched __down_write_neste
{
struct rwsem_waiter waiter;
struct task_struct *tsk;
+ unsigned long flags;
- spin_lock_irq(&sem->wait_lock);
+ spin_lock_irqsave(&sem->wait_lock, flags);
if (sem->activity == 0 && list_empty(&sem->wait_list)) {
/* granted */
sem->activity = -1;
- spin_unlock_irq(&sem->wait_lock);
+ spin_unlock_irqrestore(&sem->wait_lock, flags);
goto out;
}
@@ -216,7 +217,7 @@ void fastcall __sched __down_write_neste
list_add_tail(&waiter.list, &sem->wait_list);
/* we don't need to touch the semaphore struct anymore */
- spin_unlock_irq(&sem->wait_lock);
+ spin_unlock_irqrestore(&sem->wait_lock, flags);
/* wait to be given the lock */
for (;;) {
_
On Wed, 2006-12-20 at 02:37 -0800, Andrew Morton wrote:
> On Wed, 20 Dec 2006 04:59:19 -0500
> Chuck Ebbert <[email protected]> wrote:
>
> > > On 12/19/06, Chuck Ebbert <[email protected]> wrote:
> > > > So an external interrupt occurred, the system tried to use interrupt
> > > > descriptor #39 decimal (irq 7), but the descriptor was invalid.
> > >
> > > but the irq is disabled at that time.
> > >
> > > can you use attached diff to verify if the irq is enable somehow?
> >
> > But it seems interrupts are on--look at the flags:
> >
> > RSP: 0018:ffffffff803cdf68 EFLAGS: 00010246
> >
>
> down_write()->__down_write() -> __down_write_nested()->spin_unlock_irq()->dead
since down_write() sleeps..... what?