Date: Tue, 15 Mar 2016 14:41:14 -0700 From: Neel Natu <neelnatu@gmail.com> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: Re: -current host, 10.1 client loops Message-ID: <CAFgRE9HFVZFdA9f6itRQQAnKWvXPJi8ukFyhPxxsnNYk=d1pmg@mail.gmail.com> In-Reply-To: <23329.1458077441@critter.freebsd.dk> References: <20918.1458052609@critter.freebsd.dk> <CAFgRE9HQyq9tsM8PNzCAzQ2AwKenstaELcn0VsYHG4wzK4fXsA@mail.gmail.com> <23329.1458077441@critter.freebsd.dk>
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Hi, On Tue, Mar 15, 2016 at 2:30 PM, Poul-Henning Kamp <phk@phk.freebsd.dk> wrote: > -------- > In message <CAFgRE9HQyq9tsM8PNzCAzQ2AwKenstaELcn0VsYHG4wzK4fXsA@mail.gmail.com> > , Neel Natu writes: > >>Also, if it is possible to reproduce with a single vcpu then it will >>help when analyzing the output of ktrdump. > > Well, on the gutfeeling that it might help I gave a '-c 1' and that > seems to prevent the problem from happening so I could get my builds > done. > > So some kind of synchronization issue maybe ? > Yes, that might be possible. A couple of suggestions to narrow it down further: - try to reproduce with 2 or 4 vcpus (3 cpus is probably not a well tested configuration) - try to reproduce with the ahci-hd device emulation instead of virtio-blk. If this problem is reproducible then I am happy to work with you to get to the bottom of this. best Neel > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > phk@FreeBSD.ORG | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence.
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