Re: hwclock failure in x86.git

From: Kevin Winchester
Date: Thu Jan 10 2008 - 21:04:58 EST


On Thu, 10 Jan 2008 17:13:51 -0800
"H. Peter Anvin" <hpa@xxxxxxxxx> wrote:

> Kevin Winchester wrote:
> > H. Peter Anvin wrote:
> >> Kevin Winchester wrote:
> >>> My first time building and booting the mm branch of x86.git was pretty
> >>> successful. The only error I noticed was the following in my dmesg:
> >>>
> >>> hwclock[622] general protection ip:804b226 sp:bff43e30 error:0
> >>>
> >>> I'm not sure exactly how to debug this. I could bisect, but there seems
> >>> to be some useful debug information in there, so there might be
> >>> something better to try first.
> >>>
> >> That's a userspace IP; it implies the userspace hwclock binary did
> >> something bad, or the kernel didn't permit it to do something it should
> >> have. The best thing to do would probably to strace hwclock and see
> >> what it did when it died.
> >>
> >
> > Unfortunately, but the time I can get a chance to run hwclock, the
> > problem seems to have fixed itself. I tried booting into single user
> > mode, but `/etc/init.d/hwclock.sh restart` succeeds once I have my prompt.
> >
>
> The other thing you can do is to download the debug information and
> source code for hwclock from your particular distro, and find out
> exactly what operation inside the hwclock binary is triggering the segfault.
>
> The only other option is to bisect.
>

Bisect says...

4b5ea240a0c05ff90c4959fd91f0caec7b9bef1b is first bad commit
commit 4b5ea240a0c05ff90c4959fd91f0caec7b9bef1b
Author: mboton@xxxxxxxxx <mboton@xxxxxxxxx>
Date: Wed Jan 9 13:31:11 2008 +0100

x86: ioport_{32|64}.c unification

ioport_{32|64}.c unification.

This patch unifies the code from the ioport_32.c and ioport_64.c files.

Tested and working fine with i386 and x86_64 kernels.

Signed-off-by: Miguel Botón <mboton@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

I'll take a look at the unification and see if I can see anything obvious.

--
Kevin Winchester <kjwinchester@xxxxxxxxx>
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