Kernel booting stuck at "CPU1: Booted secondary processor"

From: getarunks@gmail.com (Arun KS)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Kernel booting stuck at "CPU1: Booted secondary processor"
Date: Tue, 17 Mar 2015 15:14:21 +0530	[thread overview]
Message-ID: <CABOM9ZrTHhP0CJT+LhpdGsKUYme7v5yb9eKwvF=A=HEfVzRhxg@mail.gmail.com> (raw)
In-Reply-To: <CAGAs2AkU=mGxjm1sLNiSqD7yvxROUxRrqqN0z4QBrPCRkdnVvg@mail.gmail.com>

Hello Ayan,

On Tue, Mar 17, 2015 at 11:44 AM, AYAN KUMAR HALDER
<ayankumarh@gmail.com> wrote:
> Hi,
>
> I am porting kernel (3.14.22) on a custom ARM(Cortex A9 x 3) based platform.
> I was able to get it working on uniprocessor mode.
> Now I wish to get the SMP mode working as mine is Cortex A9 x3 platform.
> However, I see that the booting gets stuck after the following log:-
>
> CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
> Setting up static identity map for 0x1f9690 - 0x1f96c4
> CPU1: Booted secondary processor
>
> When I debugged it further, I found that it waits endlessly in a
> arch_spin_lock() :-
>
> while (lockval.tickets.next != lockval.tickets.owner) { // loops here
>         wfe();
>         lockval.tickets.owner = ACCESS_ONCE(lock->tickets.owner);
>     }
>
> It would be great if someone can give me pointers about how to proceed ahead.
Now that its pretty sure you are hitting a deadlock. Next step is to
understand the code and find out what is causing it.

Thanks,
Arun

>
> Regards,
> Ayan kumar Halder
>
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