From: Thomas Gleixner <tglx@linutronix.de>
To: Grant Likely <grant.likely@secretlab.ca>
Cc: LKML <linux-kernel@vger.kernel.org>,
linux-rt-users <linux-rt-users@vger.kernel.org>
Subject: Re: [ANNOUNCE] 3.6.5-rt15
Date: Thu, 15 Nov 2012 18:59:54 +0100 (CET) [thread overview]
Message-ID: <alpine.LFD.2.02.1211151858450.2701@ionos> (raw)
In-Reply-To: <CACxGe6uau6HCa3jpSzw7uwNtufCNCPN=Pt3BuoFBuNE_D7WFAw@mail.gmail.com>
On Wed, 14 Nov 2012, Grant Likely wrote:
> Hey Thomas,
>
> I get a kernel bug when going from rt14 to rt15. It appears that
> preempt_lazy on my ARM platform causes (or exposes) the following
> backtrace on boot. I'm basing this on the only relevant change between
> rt14 and rt15 is the typo fix that enables PREEMPT_LAZY. I also see
> the problem on -rt16 and -rt17.
>
> (full boot log also attached below)
>
> The actual backtrace changes every time, but it is always related to
> an rt_spin_lock() call.
>
> This is on a TI AM3894 platform which is equivalent to a TI8160
> without the DSP. The board support isn't mainlined, but there is
> nothing particularly exotic about the changes. It is primarily device
> drivers and device driver data. Cortex-A8 platform.
>
> Any thoughts on how to debug this?
Probably by staring at the patch to the ASM code in arch/arm. I bet I
messed that up somehow :)
Thanks,
tglx
prev parent reply other threads:[~2012-11-15 17:59 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-02 22:11 [ANNOUNCE] 3.6.5-rt15 Thomas Gleixner
2012-11-14 13:09 ` Grant Likely
2012-11-15 17:59 ` Thomas Gleixner [this message]
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