Re: Three failure modes seen with -current amd64 modular kernels (somewhat lengthy)

[Paul Goyette <paul%vps1.whooppee.com@localhost>]

On Tue, 3 Nov 2015, Paul Goyette wrote:

> > I'm still trying to figure out what's going on with all three of these
> > issues, but i'm not making any progress.  I have determined that, for
> > issue #2, the problem can be masked by manually loading the nfs module,
> > preventing it from being auto-{,un}loaded as a dependency of nfsserver,
> > which in turn is a recently-introduced dependency of compat_netbsd32.
> > (This is similar to the work-around for issue #1 where manually loading
> > the mqueue module hides the issue.)  Without this dependency, the
> > compat_netbsd32 module fails to load because symbol do_nfssvc is not
> > resolved.
> >
> > If anyone has any ideas on how to make some progress, I'd be happy to
> > try them out.  At least I can recreate two of the issues in a qemu
> > environment without putting my production box at risk!
>
> Hooray!  Issue #2 (below) is resolved with the following commit
>
> 	Module Name:    src
> 	Committed By:   pgoyette
> 	Date:           Mon Nov  2 09:57:43 UTC 2015
>
> 	Modified Files:
> 	        src/sys/nfs: nfs_vfsops.c
>
> 	Log Message:
> 	Don't forget to call nfs_fini() when we're finished.  Without this,
> 	we leave a dangling pool nfsrvdescpl around.
>
>
> 	To generate a diff of this commit:
> 	cvs rdiff -u -r1.230 -r1.231 src/sys/nfs/nfs_vfsops.c
>
>
> One down, two remaining.

Perhaps with not too much surprise, this commit also seems to have
addressed my Issue #1 (crash in pool_destroy() when unloading the
mqueue module).

So it seems that the only issue remaining is the one where sysv_ipc
was getting incorrect entries on its sysctllog, and this issue has
already gone under deep cover (and can no longer be reproduced).



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| Paul Goyette     | PGP Key fingerprint:     | E-mail addresses:       |
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