At Tue, 11 Apr 2000 12:37:18 -0600,
Ian S. Nelson <ian.nelson@xxxxxxxxxxxx> wrote:
>
>
> How do I submit bugs?
just send it to the list at the moment.
> I've been hammering on XFS and it works great until I export it and
> start hammering on it over NFS. It pretty regularly causes a kernel
> panic or some distortion of data. Files aren't read properly, can't
> remove directories, things like that. I suspect this may not be a
> "supported configuration" yet but I was doing concurrent kernel
> compiles to stress it out and I wanted to do a few more, only CPU cycles
> were starting to be the limiting factor (thus NFS and another CPU seemed
> to make sense) It seems like something is getting confused, perhaps NFS
> takes a short cut through the VFS layer that XFS doesn't know about or
> something like that.
>
> pagebuf_get(..) is where the panic occurs, "kernel can't handle
> NULL pointer exception"
>
> I looked at the pagebuf_get source and the first thing that jumped out
> to me was that the comment says ip can can be NULL but it's never
> checked to see if it's NULL, it's just dereferenced. So that kind of
> looks like a bug, I'm not familiar enough with the code to tell what
> the proper fix is though. Just returning probably isn't the best
> solution.
> I put some printk statments (if (ip==NULL) printk(...); ) in to try and
> pin down where it was but they never wrote anything out, it just drops
> into kdb.
>
Send the back trace.
I'm probably chasing the same bug right now.
Where was this comment about ip possibly being null.
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