[PC-BSD Dev] More ZFS odd behaviors

Kris Moore kris at pcbsd.org
Tue Jul 9 13:05:49 PDT 2013

On 07/08/2013 20:25, Claudio L. wrote:
> Hello,
> I found another "easter egg" in the ZFS system.
> I have 7 virtual disks in .VDI (Virtualbox) format, that will crash
> the FreeBSD boot loader, even the distribution CD's are unable to boot
> if any of these disks is present on the system.
> Why or how this happened is a complete mystery.
> While testing the disk manager, I created 7 virtual disks and I added
> them to my VM for testing. I created, destroyed, exported, imported
> pools and what not multiple times.
> I rebooted many times in the last month and everything worked perfectly.
> Then I upgraded PCBSD to the latest release and rebooted. The boot
> loader stopped giving an error int13, function 42, can't use 64bit LBA.
> I inserted the PCBSD install DVD (from June, so it's not the latest),
> and surprise: it can't boot either, same error.
> If I remove all the disks except the system disk from the VM, the
> machine works fine (the DVD also boots). If I create 7 new disks, it
> works fine, but if I try to add any one of those VDI's, FreeBSD
> crashes on the boot loader.
> I guess during the update, something was written to those 7 disks that
> makes the ZFS code crash (or perhaps it's not on the disks?). All 7
> cause the same effect, but not my system disk, which is also ZFS, and
> was mounted at the same time with the others.
> I don't know the exact cause, but I think the ZFS code in the
> bootloader is the one to blame. The problem can be reproduced 100% of
> the times, I can send the .VDI files if there's someone willing to
> find and fix the problem (it's only 5MB each file, since they are
> basically empty disks).
> Claudio

I'll CC Xin on this, see if this is something he is interested in
looking at.

Kris Moore
PC-BSD Software

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