netdev - Re: APIC error on 32-bit kernel

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Date:	Tue, 27 Mar 2007 14:42:20 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Jay Cliburn <jacliburn@...lsouth.net>
Cc:	netdev@...r.kernel.org
Subject: Re: APIC error on 32-bit kernel

Jay Cliburn <jacliburn@...lsouth.net> writes:

> We're trying to track down the source of a problem that occurs whenever
> the atl1 network driver is activated on a 32-bit 2.6.21-rc4 kernel.  We
> need help from netdev.
>
> We can load the driver just fine, but whenever we activate the
> network, we see APIC errors (a sample of them are shown here,
> captured from a serial console):

Do you have msi's working in 2.6.21-rc4 in the x86_64 kernel?

[snip nasty apic errors]

> The machine hangs for about 5-10 seconds, then spontaneously reboots
> without further console output.
>
> This is an Asus M2V (Via K8T890) motherboard.
>
> The problem does not occur on a 32-bit kernel if we boot with
> pci=nomsi, and it doesn't occur at all on a 64-bit kernel on the same
> motherboard.

Ok.

My first guess is going to be that something different in the 64bit
and 32bit kernels.  Either MSI support or how the MSI are setup or
some bug work around.

A lot of that code is pretty common so...

> We also do not see this problem on Intel-based motherboards, with
> either 32- or 64-bit kernels.

Can you confirm MSI is enabled in those kernels as well?

> We'd appreciate any pointers to get this solved.  Full error text,
> dmesg (with atl1 device disabled), lspci, and /proc/interrupts attached.

Thanks.

Eric
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