OK, this is my first attempt at anything really kernel related, so feel free
to flame away.
2.3.99-pre5, configured for NFS Root, mounts the / directory (according to
logs on the other machine) then Oopses with a NULL pointer dereference.
ksymoops tells me it's in xdr_decode_fhstatus. I can't figure out how this code
could work (printks are mine):
in fs/nfs/mount_clnt.c, line 120:
static int
xdr_decode_fhstatus(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res)
{
printk( "res==%lx, res->fh=%lx\n", res, res->fh ) ;
memset((u8 *)res, 0, sizeof(*res));
printk( "res==%lx, res->fh=%lx\n", res, res->fh ) ;
if ((res->status = ntohl(*p++)) == 0) {
printk( "p==%lx, ntohl(*p++)=%x\n", p, ntohl(*(p-1)) ) ;
fails---> res->fh->size = NFS2_FHSIZE;
memcpy(res->fh->data, p, NFS2_FHSIZE);
}
return 0;
}
By definition, isn't res->fh going to always be NULL? I certianly don't
understand NFS enough to make a more detailed investigation, but I'm fairly
confident on this point (just call me an idiot).
It also looks like the next function, xdr_decode_fhstatus3, may also suffer
from the same issue, be it my misunderstanding or an actual problem.
If anyone can give some insight into what should happen here, I'll
gladly put effort into it.
Find ksymoops output attached.
Humbly yours,
Ben Von Handorf
handorf@penguinpowered.com
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