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Date: Tue, 04 Apr 2006 09:53:17 +0200
From: Philippe Gerum <rpm@xenomai.org>
MIME-Version: 1.0
Subject: Re: [Xenomai-help] Panic in rt_queue_create: bug or misuse?
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To: "Brian L." <bluczkie@domain.hid>
Cc: xenomai@xenomai.org

Brian L. wrote:
> I apologize for not including the panic here. I will be obtaining a
> serial cable tomorrow and accessing panic text should become much
> simpler. Since the panic is several screen-fulls long, even if I were
> to painstakingly type it in, it would be missing vital information.
> 
> I'm posting this now in case this is a known issue with a simple fix.
> Newsgroup history doesn't turn up any messages with rt_queue_create
> and panic in the past few months. I am running xenomai 2.1.0 on linux
> 2.6.15 with APIC disabled in kernel config on a celeron 566/440bx.
> 
> Code:
> ======
> int main() {
> RT_TASK main_task;
> RT_QUEUE queue;
> RT_MUTEX lock;
> 

    mlockall(MCL_CURRENT|...) ?

> if (0 != rt_task_shadow(&main_task,"MAIN",1,T_FPU)) {
>    die("Couldn't Shadow Main Task\n");
> }
> 
> rt_mutex_create(&lock,0);
> rt_queue_create(&queue,"log_queue",8192,100,Q_FIFO);
> ...
> }
> ======
> 
> The kernel panics and freezes the test machine in rt_queue_create. I
> will post panic text as soon as it is accessible to me. The panic
> occurs whether or not I shadow the main task and whether or not the
> mutex is named. Am I misusing an API or am I possibly looking at a
> bug?
> 
> The bottom 25 lines of the panic seem to involve a call to the ipipe
> exception handler every 6-8 lines. It doesn't look like endless
> recursion, though, so we could just be walking up an exception tree.
> I'm missing the top of the trace and the panic type because it doesn't
> get logged and I can't scroll a frozen machine.
> 
> Thanks,
> 
> Brian
> 
> _______________________________________________
> Xenomai-help mailing list
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> 


-- 

Philippe.