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btrfs-cleaner frequently stuck at 100% CPU after 6.4.0 upgrade
Since I upgraded my RN102 to 6.4.0 last night I frequently have trouble reaching the admin interface, and my laptop has reported not being able to reach Time Machine. When I login by ssh and use ...
It seems like I found a way to get rid of the hanging btrfs-cleaner: After switching off quota
btrfs quota disable /data
btrfs-cleaner did never show up again (in top).
(After booting I usualy had about a minute to issue the command before btrfs-cleaner did spawn and prevented the command to respond.)
I did not intentionally enable quota - i guess it was enabled by default.
Good luck,
HansW
PS: Maybe the problem is known by Netgear - in their "FAQs on recently released firmware 6.4.0" (see link on top of page) they talk about "... this is likely due to the ReadyNAS performing a quota check".
Some websites also describe problems with quota and btrfs (Rockstor forum), other sites cite the quota support in btrfs as experimental (but these might be out of date).
I did not extensive testing after diabling quota that way - I'm happy that I can acces my files again ...
Did it remove a bunch of your old snapshots? If you have snapshots and Smart Snapshot Management cleans up these snapshots, btrfs-cleaner will be busy wiping away those snapshots. In 6.4.0, we upgrade to the latest version of snapshots (which is why you can't downgrade from 6.4.0), so this could also be related.
Is there any way to turn on logging for btrfs-cleaner to find out what it's up to? As it is, I don't know why it seems to be taking longer than before since my usage profile hasn't changed that much since upgrading...
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