Re: 3.18.9-rt4 kernel panic - Was: 3.18.9-rt4

[Joakim Hernberg <jhernberg@alchemy.lu>]

On Sat, 14 Mar 2015 10:43:36 +0100
Ralf Mardorf <ralf.mardorf@rocketmail.com> wrote:

> On Fri, 13 Mar 2015 22:30:41 +0100, Ralf Mardorf wrote:
> >all kernels >= 3.14.34-rt31 I tested, don't finish startup on my
> >machine [1]. This are the last messages of startups for 4 different
> >startups for 3.18.9-rt4.
> >
> >Picture URLs:
> >http://picpaste.com/3.18.9-rt4.x86_64.end_of_startup_2.jpg
> >http://picpaste.com/3.18.9-rt4.x86_64.end_of_startup_3.jpg
> >http://picpaste.com/3.18.9-rt4.x86_64.end_of_startup_4.jpg
> >http://picpaste.com/3.18.9-rt4.x86_64.end_of_startup_5.jpg
> >
> >The last kernel I tested that does work is 3.14.28-rt25.
> 
> Hi,
> 
> this morning the messages finished with a kernel panic.
> 
> Picture URL:
> http://picpaste.com/3.18.9-rt4.x86_64.end_of_startup_6.jpg

Let me try to add some information that I think might be relevant to
the problem.

I remember that you had boot problems a while ago, together
with a couple of other AMD cpu users.  IIRC it just affected a few
specific AMD cpus.  AFAIK, you could not succesfully boot any kernel
starting with with 3.12.6-rt9, and I have another report from another
afflicted user saying that the boot problem was fixed by reverting:

timers-do-not-raise-softirq-unconditionally.patch
timer-Raise-softirq-if-there-s-irq_work.patch
timer-rt-Always-raise-the-softirq-if-there-s-irq_wor.patch

This might be significant, as these patches are in play again, at
least on 3.18-rt.

Try to revert those patches and see if the kernel can boot.

-- 

   Joakim