VFS MFC testers wanted

Kris Kennaway kris at obsecurity.org
Tue Mar 7 18:24:05 UTC 2006

On Tue, Mar 07, 2006 at 10:15:59AM -0800, David Kirchner wrote:

> Do you have a list of the PRs that this affects and/or resolves?

I don't know of any relevant PRs, but I haven't looked very hard.  The
bugs Jeff has been fixing are mostly those I've been able to reproduce
myself in testing.

> I'm curious, specifically, about kern/84589. I believe it may be
> related to snapshots in some way, but I don't know. I'm not going to
> be able to test the patch on these servers, unfortunately, as they're
> fully in production now. The servers are stable now with
> background_fsck="NO", but "YES" is still the default (last I checked).

You need to enable debugging, specifically KDB, DDB, INVARIANTS,
patch applied, as it gives more useful debugging).  Then reproduce the
deadlock condition, break to DDB and do 'show lockedvnods' and 'wh
<pid>' where <pid> are the processes listed as holding locks.

> Also: http://www.freebsd.org/releases/6.1R/todo.html
> The todo page mentions deadlocks but doesn't link to any specific
> PRs/threads that discuss them. Are these fixed with this MFC?

Some deadlocks are resolved, yes.  There are other snapshot-related
deadlocks that are not fixed with this patch, but which Jeff and
others are still working on.

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