Andrew Morton writes:
> Mikael Pettersson <[email protected]> wrote:
> >
> > My trusty network server (440BX PentiumIII box serving NFS and News)
> > just threw the following at me:
> >
> > Bad page state at prep_new_page (in process 'python', page c10984e0)
> > flags:0x20021008 mapping:00000000 mapcount:0 count:0
> > Backtrace:
> > [<c0137555>] bad_page+0x75/0xb0
> > [<c01378aa>] prep_new_page+0x2a/0x70
> > [<c0137e60>] buffered_rmqueue+0xc0/0x1c0
> > [<c01380f0>] __alloc_pages+0xc0/0x400
> > [<c01425a9>] do_anonymous_page+0x79/0x150
> > [<c0142870>] do_no_page+0x1f0/0x360
> > [<c0142c2d>] handle_mm_fault+0x13d/0x170
> > [<c0110c92>] do_page_fault+0x2a2/0x6bf
> > [<c0111d12>] recalc_task_prio+0xc2/0x170
> > [<c026b49b>] schedule+0x31b/0x5c0
> > [<c01109f0>] do_page_fault+0x0/0x6bf
> > [<c0102dbf>] error_code+0x4f/0x54
> > Trying to fix it up, but a reboot is needed
> >
> > It's running 2.6.12-rc3 since last Friday, but had been running
> > 2.6.12-rc2 for weeks before that w/o problems. 2.4 kernels and
> > most recent 2.6 kernels have always been rock solid on it.
> >
>
> PG_swapcache is set. It wasn't set when this page was returned to the page
> allocator.
>
> > This is the first time this box has had a problem like this.
> > While I can't rule out bad memory (I'll memtest86 it when I
> > get a chance to), I'm inclined to suspect a 2.6 kernel bug.
>
> Could be a bug, but it'd be a damn unusual one. I wouldn't rule out a
> bitflip.
Confirmed, it was a HW issue. Please disregard the original problem report.
(A recent upgrade led to a combination of front side bus speed setting
and number of unregistered memory modules that the chipset couldn't quite
handle. Darn, I would have preferred it to have been a bad SIMM.)
/Mikael
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