Messages in this thread Patch in this message |  | | | Date | Tue, 22 May 2012 10:03:20 -0700 | | From | Tejun Heo <> | | Subject | Re: Linux 3.4 released |
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On Tue, May 22, 2012 at 06:52:49PM +0200, Jörg-Volker Peetz wrote: > I tried the above patch but was not able to see a line beginning with "XXX", not > on the text-console nor in any log-file. After the hard-lock, I can see only the > console-screen which now changed slightly: > > BUG: Unable to handle kernel NULL pointer dereference at 0000000000000008 > IP: [<ffffffff8103ed60>] delayed_work_timer_fn+0x30/0x60
Oh, &cwq->wq is at offset 8 so cwq should have been -8. Maybe I'm just confused. Can you please try the following instead?
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 5abf42f..14babfe 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1096,10 +1096,16 @@ queue_work_on(int cpu, struct workqueue_struct *wq, struct work_struct *work) } EXPORT_SYMBOL_GPL(queue_work_on); +#include <linux/uaccess.h> static void delayed_work_timer_fn(unsigned long __data) { struct delayed_work *dwork = (struct delayed_work *)__data; struct cpu_workqueue_struct *cwq = get_work_cwq(&dwork->work); + unsigned long v; + + if (probe_kernel_read(&v, &cwq->wq, sizeof(v))) + printk("XXX delayed_work_timer_fn: cwq %p, fn=%pf\n", + cwq, dwork->work.func); __queue_work(smp_processor_id(), cwq->wq, &dwork->work); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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