Macvlan call traces are usually the result of dockers with a custom IP address, more info here.
For better stability also a good idea to respect max AMD officially supported RAM speed for your config, which is 1333Mhz, not 1600.
You need to use the latest beta, it can be download from here:
https://s3.amazonaws.com/dnld.lime-technology.com/next/unRAIDServer-6.9.0-beta29-x86_64.zip
Do you mean newer kernel/tools than this beta?
df is still working correctly for me:
Filesystem Size Used Avail Use% Mounted on
/dev/sdf1 1.4T 3.6M 930G 1% /mnt/cache
And now the newer btrfs tools in beta29 also support raid5/6:
btrfs fi usage -T /mnt/cache
Overall:
Device size: 1.36TiB
Device allocated: 17.06GiB
Device unallocated: 1.35TiB
Device missing: 0.00B
Used: 288.00KiB
Free (estimated): 930.15GiB (min: 700.11GiB)
Data ratio: 1.50
Metadata ratio: 2.00
Global reserve: 3.25MiB (used: 0.00B)
Multiple profiles: no
df reports the correct used and free space for every possible combination (AFAIK) except raid1 with an odd number of devices, but that's a btrfs bug and should be fixed in the near future.
There was no parity.
That's not the problem, problem is that Unraid rejects the disk after a reboot, and worse than that partition is invalid and disk can't be mounted again, it's easy to reproduce if you do the steps I outlined above.
You can use the invalid slot command if you have a spare disk of the same size or larger, I can post the instructions for that.
If you can't do it in the GUI disable array auto-start by editing disk.cfg on your flash drive (config/disk.cfg) and changing startArray="yes" to "no".
By using the new config with the "trust parity" option, this assuming nothing changed on the array since you added the new parity, still:
because of mounting the array without it, even if no data was changed.
You shouldn't have done that, it's not possible to successfully sync parity with a failing disk, and now old parity won't be 100% in sync, but it's still your best bet, do a new config with it, check parity is already valid, then do the parity swap.