Date: Tue, 25 Oct 2005 09:33:06 +0200 From: Danny Braniss <danny@cs.huji.ac.il> To: frank@exit.com Cc: alsbergt@cs.huji.ac.il, FreeBSD-Current <current@freebsd.org> Subject: Re: Race in NFS in 6.0-RC1? Message-ID: <E1EUJIw-000KM1-UR@cs1.cs.huji.ac.il> In-Reply-To: Message from Frank Mayhar <frank@exit.com> of "Mon, 24 Oct 2005 23:34:33 MST." <1130222074.1792.13.camel@realtime.exit.com>
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> I've started using NFS in 6.0 a little more heavily lately, as since the > em(4) wedge has been fixed I can actually use it reliably. > Unfortunately there appears to be a problem. Twice, now, in less than > 24 hours the client has paniced under load. Both times it was building > OpenOffice in an NFS-mounted /usr/ports. In case it matters, it's a > soft mount from another 6.0 box over an em(4) interface with an MTU of > 9000. > > Both times it was a panic from vnlru while trying to flush a vnode and > both times it was a null-pointer dereference in nfs_putpages() at > nfs_bio.c:301. In both cases vp->v_data was null. The vnode itself > looks fine to my eyes, although there may well be FreeBSD-specific > subtleties that I'm missing. I've just entered a PR for this problem, > kern/87967. I'll keep the cores around; if anyone wants more > information from them, let me know. As may be apparent, I can reproduce > this fairly easily, although it takes a few minutes for it to trigger. > > The worrying thing about this is, in fact, its reproducibility. This looks very similar to a problem we have with a 5.4 box running samba, it has an em(4), no jumbo packets, but is heavely doing nfs - the files are on a netapp filer. the problem is not easely reprodusable, but it happens. danny
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