[Re: [ltp] kernel: memory.c:83: bad pmd]

Jim Peden linux-thinkpad@linux-thinkpad.org
Fri, 03 Jan 2003 13:47:26 -0700

My A20 had two 256meg sticks of memory. I pulled one and rebooted ..... n=
luck. I pulled that one and replaced it with the other one. Bingo! It wor=
but not before my first hard drive had had one to many fsck's die in the
middle of scanning the disk. :( So I'm re-installing now. The other drive=

worked fine. I did a couple of runs on it that would have sent the kernel=

screaming into a panic. =


Vivek <vivek@etla.org> wrote:
> On Fri, 3 Jan 2003, Jim Peden wrote:
> =

> > Hi All,
> >
> > I have an A20 Thinkpad running Redhat 7.2 (linux-2.4.7-10). Just last=

> > night I started getting this error: "kernel: memory.c:83: bad pmd". T=
> > the I get a kernel panic and so on. It has been running 7.2 for month=
> > with a problem. I started thinking it was the hard drive. I had an ol=
> > Redhat 6.2 hard driving I had pulled out of my thinkpad, the hard dri=
> > that came with the Thinkpad. I installed the old drive and I get the =
> > thing.
> >
> > Does anyone have ANY clues on this one???????
> =

> Well, a quick dive into the kernel source turns up the fact that the
> pmd functions are to do with page tables: I reckon ( and a quick trawl
> via google of the lkml seems to back this up ) that you may have some
> bad memory there.
> =

> Do you have some other memory you can swap in to check this?
> =

> Also, you can boot up the machine, shut down all the services you
> don't need (X, any databases or webservers, the network and so on),
> and see if you can get through 3 or 4 consecutive kernel compiles
> with "make -j 2 bzImage" w/o triggering a panic : If you can, it
> probably isn't a memory problem.
> =

> =

> -- =

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