Re: [BUG 3.12.rc4] Oops: unable to handle kernel paging requestduring shutdown

From: Ingo Molnar
Date: Sat Oct 26 2013 - 07:43:33 EST

* Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:

> On Fri, Oct 25, 2013 at 11:23 AM, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> >
> Yes, but nobody has actually been able to trigger it with those.
> It's pretty rare, and the debug options are so expensive that they
> aren't reasonable to enable generally...
> So we need to try to figure out how to trigger it, or narrow
> things down some way..

If it's timing then maybe the 1 seconds delay isn't enough
(especially if it's boot related, where we have a couple of delays
already) - the patch below triples it.

(If the bug goes away due to some other side effect then this patch
won't make a difference to reproducability.)



diff --git a/lib/kobject.c b/lib/kobject.c
index 084f7b1..124188f 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -595,7 +595,7 @@ static void kobject_release(struct kref *kref)
pr_info("kobject: '%s' (%p): %s, parent %p (delayed)\n",
kobject_name(kobj), kobj, __func__, kobj->parent);
INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);
- schedule_delayed_work(&kobj->release, HZ);
+ schedule_delayed_work(&kobj->release, 3*HZ);
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