Re: zfs corruption at zroot/usr/home:<0x0>

On Wed, Nov 12, 2025 at 10:25 AM Sad Clouds <cryintothebluesky@gmail.com> wrote:
>
> On Wed, 12 Nov 2025 03:58:34 +0100
> Tomek CEDRO <tomek@cedro.info> wrote:
>
> > Hello world :-)
> >
> > On 14.3-RELEASE-p5 amd64 I have encountered a kernel panic (will
> > report on bugzilla in a moment). After that I found some sites did not
> > load in a web browser, so my first guess was to try zpool status -v
> > and I got this:
> >
> > errors: Permanent errors have been detected in the following files:
> >         zroot/usr/home:<0x0>
> >
> > Any guess what does the <0x0> mean and how to fix the situation?
> > It should be a file name right?
> >
> > zpool scrub and resilver did not help :-(
> >
> > Will rolling back a snapshot fix the problem?
> >
> > Any hints appreciated :-)
> > Tomek
> >
> > --
> > CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
> >
>
> Hi, I'm not a ZFS expert, but I wonder if this error is related to some
> of the ZFS internal objects, rather than the file data blocks being
> corrupted. In which case, ZFS may not be able to correctly repair it?
>
> I'm currently evaluating ZFS on FreeBSD for some of my storage needs
> and your report is a bit concerning. Are you able to share the details
> on the I/O workloads and the storage geometry you use? Do you have more
> info on the kernel panic message or backtraces?
>
> If you put it all in the bug, then can you please share the bug ID?
>
> Thanks.

Hmm this is brand new NVME drive not really likely to fail. I have the
same problem on zraid0 (stripe) array while initially I saw the bad
file name with 3 problems (vm image) it now turned into
ztuff/vm:<0x482>. Charlie Foxtrot :-(

I also have 4x4TB HDD zraid2 array and this one was not affected.

I have some snapshots will try to revert and see if that helps. Before
that I will backup data and then try to recover what is possible after
snap rollback.

--
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info