btrfs fail [reboot fixed it]

[jesnow]

Hi Everybody:

I came back to one of my systems after a long absence, and was happily updating it when I discovered that my /home partition was mounted ro. How strange! dmesg was showing a lot of errors "parent transid verify failed", so I tried to unmount it and remount it rw, and the result is "Remounting read-write after error is not allowed". /dev/sda2 is my root partition, so no problem there. I'm not doing anything wild with device spanning or raid or anything, it's just a single partition.

Like this:

[grknight]

N.B. I am not a btrfs expert and am only repeating from searches and documentation.

This is a serious error.

Some suggestions, including the former BTRFS wiki, say to use mount -o ro,usebackuproot,remount /home (or -o ro,remount,rescue on a kernel 5.9 or newer) if it is anywhere near recoverable. If so, then it may be possible to mount rw.

Failing that, there is btrfs check or btrfs rescue. Please read about these before doing anything

In any case, all operations should be preceded by a full backup as there is corruption and the potential of loss of data doing anything (even in ro).

[jesnow]

Fortunately, this particular machine has no critical data on it, I keep all my data on my server, backed up. This machine is a client I use to display things on my conference room big screen monitor.

I could lose /home entirely and not care. The disk may be bad -- that ssd was a really peculiar on that I got for $20 but is slow as mud. I will try to btrfs rescue it when it's done updating, many thanks. When mounted ro, it looks like everything is there.

Cheers,
Jon.

[jesnow]

Well, a reboot fixed it. I think.

I rebooted after the system update and got:

[Zucca]

I'd make a backup now. At least backup .config or whatever may your $XDG_CONFIG_HOME be.
_________________
..: Zucca :..

[jesnow]

Yes of course. I think possibly this SSD is wonky. It has no data on it, it is a client-only system.

Thanks!
Jon.