Re: kern/48027: nfsserver module doesn't work

[Paul Goyette <paul%whooppee.com@localhost>]

On Mon, 8 Jul 2013, David Holland wrote:

> Ah.
>
> That is odd - given that the only way you should be getting SIGSYS is
> if the nfssvc() syscall doesn't get installed, and that happens as
> basically the first step in the module initialization. (Which is
> supposed to be called whether or not the code is compiled in or loaded
> on the fly.)
>
> And if there's something it depends on that's missing, in the builtin
> case that ought to just result in link failure.

Yes, I agree.

> Are you sure it loads/attaches successfully? If it starts to load and
> then unloads itself for some kind of error, it will uninstall the
> syscall and then nfsd won't go.

I noticed that the module initialization code doesn't check for an error 
return from syscall_establish().  Also the termination code doesn't look 
at the error return from syscall_disestablish().  Given that I've seen 
at least one kernel crash triggered directly from modunload(8), I do 
suspect this code.

> My inclination would be to add some printfs in that initialization
> code to see where it does and doesn't get.

Yes, that's the next step.  I've been trying to monitor progress via 
syslog() calls in userland nfsd, but now need more granularity/detail.

>  >  Note that everything "used to work" just fine on 6.99.17.  It has
>  >  only broken since I updated to 6.99.23
>
> Maybe someone broke module initialization.

Well, I have lots of other modules loaded, without any issues, so I 
don't think that the module infrastruture is broken.  Just something 
wrong with this one.



-------------------------------------------------------------------------
| Paul Goyette     | PGP Key fingerprint:     | E-mail addresses:       |
| Customer Service | FA29 0E3B 35AF E8AE 6651 | paul at whooppee.com    |
| Network Engineer | 0786 F758 55DE 53BA 7731 | pgoyette at juniper.net |
| Kernel Developer |                          | pgoyette at netbsd.org  |
-------------------------------------------------------------------------