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Re: kern/42228: Kernel deadlock prevents further file system access
The following reply was made to PR kern/42228; it has been noted by GNATS.
From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
Cc: kern-bug-people%NetBSD.org@localhost, gnats-admin%NetBSD.org@localhost,
Subject: Re: kern/42228: Kernel deadlock prevents further file system access
Date: Sun, 25 Oct 2009 15:15:07 +0100
On Sun, Oct 25, 2009 at 02:05:03PM +0000, Matthias Scheler wrote:
> > > The function after "namei" differs from case to case. Examples are
> > > vn_open() or do_sys_stat().
> > this looks a lot like the ffs VOP_RENAME race issue.
> Is there a patch available which I can try out?
A first try has been posted to tech-kern but unfortunably it's buggy
(and makes things worse, we now have "looking against myself" panics).
> And I don't understand
> why that would happen frequently on one of my 24/7 NetBSD 5.0_STABLE
> systems but not on the other, they both use FFS. Is it e.g. more likely
> to happen on systems with multiple CPU cores?
Yes, multiple CPUs will make things worse, as does using WAPBL
(WAPBL is unusable for me on systems using rsync for example).
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
NetBSD: 26 ans d'experience feront toujours la difference
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