Re: Disk partitions disappear when mounting others

On Sun, Dec 25, 2022 at 09:32:55AM -0700, Warner Losh wrote:
> On Sun, Dec 25, 2022, 1:02 AM Alexey Dokuchaev <danfe@freebsd.org> wrote:
> > ...
> > The problem is that once I mount my old FreeBSD partition, e.g.
> > /dev/ada0s2a, those LVM nodes are gone, logging this:
> >
> >   GEOM_LINUX_LVM: disk pv0 already initialised in fedora
> >   GEOM_LINUX_LVM: Disk diskid/DISK-XXXXXXX1s4+00000001 removed from pv0.
> >   GEOM_LINUX_LVM: Device linux_lvm/fedora-swap removed.
> >   GEOM_LINUX_LVM: Device linux_lvm/fedora-home removed.
> >   GEOM_LINUX_LVM: Device linux_lvm/fedora-root removed.
> >
> > If I unmount /dev/ada0s2a and mount any Fedora's partition, then I can
> > longer access other slices as there's only /dev/ada0 remains; ``gpart
> > show'' also does not list them, but only those under diskid/DISK-XXXXXXX1.
> >
> > Why is this happening?  What should I fix to stop my partitions from
> > disappearing and reappearing?
> 
> Something has them open. My guess is the Linux lvm geom provider opens too
> many things. It's been standard geom behavior to remove the other device
> aliases in /dev when one is open.

Well, yeah, but it's weird to see that on a detached harddrive.  It's not
like it's still opened under another operating system, I'm simply mounting
existing partitions one by one to move my data to a new SSD.

> Though the problem may be in tasting during open since gpart list shows
> them gone.

I've found out that putting either geom_linux_lvm_load="YES" or kern.geom.
label.disk_ident.enable=0 in /boot/loader.conf remedies the problem.  Just
in case someone encounters the same issue.  When I was still booting off
this disk, I had geom_linux_lvm_load="YES" so that's probably why it did
not bite me before.

./danfe