RE: [Bug 7505] Linux-2.6.18 fails to boot on AMD64 machine

[Zhang, Yanmin]

>>-----Original Message-----
>>From: Andrew Morton [mailto:akpm@xxxxxxxx]
>>Sent: 2006年12月20日 18:38
>>To: Chuck Ebbert
>>Cc: Yinghai Lu; ard@xxxxxxxxxxxxxxx; take@xxxxxxxxx; agalanin@xxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; bugme-daemon@xxxxxxxxxxxxxxxxxxx;
>>Eric W. Biederman; Zhang, Yanmin
>>Subject: Re: [Bug 7505] Linux-2.6.18 fails to boot on AMD64 machine
>>
>>On Wed, 20 Dec 2006 04:59:19 -0500
>>Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx> wrote:
>>
>>> > On 12/19/06, Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx> wrote:
>>> > > So an external interrupt occurred, the system tried to use interrupt
>>> > > descriptor #39 decimal (irq 7), but the descriptor was invalid.
>>> >
>>> > but the irq is disabled at that time.
>>> >
>>> > can you use attached diff to verify if the irq is enable somehow?
>>>
>>> But it seems interrupts are on--look at the flags:
>>>
>>>         RSP: 0018:ffffffff803cdf68  EFLAGS: 00010246
>>>
>>
>>down_write()->__down_write()->__down_write_nested()->spin_unlock_irq()->dead
>>
>>Could someone please test this?
I couldn't reproduce it on my EM64T machine. I instrumented function start_kernel and
didn't find irq was enabled before calling init_IRQ. It'll be better if the reporter could
instrument function start_kernel to capture which function enables irq.
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