Re: page fault in ufs_fhtovp

[Martin Husemann <martin%duskware.de@localhost>]

On Mon, May 26, 2014 at 11:39:09AM +0200, Edgar Fuß wrote:
> On a 6.1/amd64 NFS server, I got the following:
> 
> uvm_fault(0xfffffe82cd149228, 0x0, 1) -> e
> fatal page fault in supervisor mode
> trap type 6 code 0 rip ffffffff803fc5a1 cs 8 rflags 10246 cr2  c8 cpl 0 rsp 
> fffffe82aaa38660
> kernel: page fault trap, code=0
> Stopped in pid 9953.3 (nfsd) at netbsd:ufs_fhtovp+0x2e: cmpw $0,c8(%rdx)

             if ((error = VFS_VGET(mp, ufhp->ufid_ino, &nvp)) != 0) {
                     *vpp = NULLVP;
                     return (error);
             }
             ip = VTOI(nvp);
             KASSERT(ip != NULL);
-->          if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen) {

Looks like the KASSERT should have caught it (in a DIAGNOSTIC kernel).
VTOI returned NULL?

Martin