linux-kernel - Re: 2.6.18-rt1

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Message-id: <200609201436.47042.gene.heskett@verizon.net>
Date:	Wed, 20 Sep 2006 14:36:46 -0400
From:	Gene Heskett <gene.heskett@...izon.net>
To:	linux-kernel@...r.kernel.org, paulmck@...ibm.com
Cc:	Daniel Walker <dwalker@...sta.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <johnstul@...ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: 2.6.18-rt1

On Wednesday 20 September 2006 14:25, Paul E. McKenney wrote:
>On Wed, Sep 20, 2006 at 10:41:58AM -0700, Daniel Walker wrote:
>> On Wed, 2006-09-20 at 10:38 -0700, Paul E. McKenney wrote:
>> > On Wed, Sep 20, 2006 at 10:00:38AM -0700, Daniel Walker wrote:
>> > > On Wed, 2006-09-20 at 12:50 -0400, Gene Heskett wrote:
>> > > >   LD      .tmp_vmlinux1
>> > > >
>> > > > kernel/built-in.o(.text+0x16f25): In function `hrtimer_start':
>> > > > : undefined reference to `hrtimer_update_timer_prio'
>> > > >
>> > > > make: *** [.tmp_vmlinux1] Error 1
>> > > >
>> > > > about half way thru the normal time.  config attached.  I don't
>> > > > think hires timers are enabled.
>> > > >
>> > > > Comments?
>> > >
>> > > Fix attached.
>> > >
>> > > Daniel
>> >
>> > Compiles for me with this patch.  Will try it out on a couple of
>> > machines.
>>
>> Ingo actually updated with a similar fix , in
>>
>> http://people.redhat.com/~mingo/realtime-preempt/patch-2.6.18-rt2
>
>OK, using that instead.
>
>I get the following at startup, which probably means that I need to use
>some machine other than a NUMA-Q.  Trying a different machine...
>
>      Thanx, Paul
>
>BUG: unable to handle kernel NULL pointer dereference at virtual address
> 00000000 printing eip:
>c01151ff
>*pde = 34d21001
>*pte = 00000000
>stopped custom tracer.
>Oops: 0000 [#1]
>PREEMPT SMP
>Modules linked in:
>CPU:    2
>EIP:    0060:[<c01151ff>]    Not tainted VLI
>EFLAGS: 00010246   (2.6.18-rt2-autokern1 #1)
>EIP is at __wake_up_common+0x10/0x55
>eax: 00000000   ebx: 00000001   ecx: c113629c   edx: 00000000
>esi: c113629c   edi: c113629c   ebp: dff25f34   esp: dff25f24
>ds: 007b   es: 007b   ss: 0068   preempt: 00000001
>Process softirq-timer/2 (pid: 27, ti=dff24000 task=dff20e30
> task.ti=dff24000) Stack: 00000000 00000000 c113629c 00000001 dff25f60
> c0115267 c113629c 00000006 00000001 00000001 00000000 00000006 00000007
> dffd5e40 c1136270 c1136240 c012ecf6 00000000 00000001 c11360e4 00000001
> 00000000 dff12000 c043b2c0 Call Trace:
> [<c0115267>] __wake_up+0x23/0x52
> [<c012ecf6>] hrtimer_run_queues+0xf6/0x10f
> [<c0123db3>] run_timer_softirq+0x13b/0x31b
> [<c011fba0>] ksoftirqd+0xff/0x194
> [<c011faa1>] ksoftirqd+0x0/0x194
> [<c012beee>] kthread+0x82/0xa7
> [<c012be6c>] kthread+0x0/0xa7
> [<c0101031>] kernel_thread_helper+0x5/0xb
>---------------------------
>
>| preempt count: 00000001 ]
>| 1-level deep critical section nesting:
>
>----------------------------------------
>.. [<c02fd493>] .... __spin_lock_irqsave+0xe/0x35
>.....[<00000000>] ..   ( <= _stext+0x3feffd68/0x41)
>
>Code: 45 14 00 00 00 00 8b 45 08 83 ca 01 89 55 0c 8b 40 04 89 45 08 5d
> e9 62 e2 ff ff 55 89 e5 57 56 53 50 8b 7d 08 8b 5d 10 8b 57 20 <8b> 02
> 89 45 f0 8d 47 20 39 c2 74 31 8b 72 f4 8d 42 f4 ff 75 18 EIP:
> [<c01151ff>] __wake_up_common+0x10/0x55 SS:ESP 0068:dff25f24

That looks like the chorus of the song I saw when it crashed on boot, 
pretty darned close to identical.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Yahoo.com and AOL/TW attorneys please note, additions to the above
message by Gene Heskett are:
Copyright 2006 by Maurice Eugene Heskett, all rights reserved.
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