On Tue, Mar 15, 2016 at 2:30 PM, Poul-Henning Kamp <p...@phk.freebsd.dk> wrote:
> --------
> In message 
> <cafgre9hqyq9tsm8pnzcazq2awkenstaelcn0vsyhg4wzk4f...@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.


> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> p...@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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