dd: vm_fault: pager read error

[grarpamp]

On Sun, Oct 8, 2017 at 3:05 PM, Eugene Grosbein <eugen at grosbein.net> wrote:
> The problem is known and already fixed. You should upgrade.

Was there a ticket and revision number to look into that?
Because this issue is still present in 11.1 and r324300.

When booting either from usb...

- Mounting ada0s1a read-only on /mnt, and giving the same
dd, still produces "Device not configured" upon an ls -R /mnt.
A umount clears that condition. Repeat.

- After triggering it read-only, but not unmounting to clear
it, a mount -uw panics the box.

- Giving the dd in unmounted state appears to be ok.


Another issue:

debugflags=16, manpage say 'allow[s]...write[ing]...sectors... to
mounted [read-write?] disk [the aforesaid mounted partition on it?]".
The manpage is unclear there. Also geom(8) does not display
that actual rank status info, ie: "Rank 1 provider". IMO, 16 should
"allow [all] foot shooting".
So mode 16 appears to be broken because the dd is denied,
even though the dd is NOT writing to the read-write mounted
s1a partition itself (which should be allowed even if it were),
but is seeking over past it.