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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with quota and btrfs (Rockstor forum), other sites cite the quota support in btrfs as experimental (but these might be out of date).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 ...
Same here with me. System: ReadyNAS 102 It might be the first reboot after the update. Uptime 2:08 hrs, load average: 8.45, 9.00, 9.97 Top shows "120:18.59 btrfs-cleaner" - quite a long time for a single process. Hoping it's not "cleaning" all my 2x3TB HDDs ;-) Admin page keeps reloading (constantly posting to "ddbroker") Copying to the NAS ("cp" over NFS4) is not returning (canelled). Directory listing in several directories either (not over NFS, not locally). The syslogs showing quite often "readynasd[3359]: thread create fail, errno=12" I will leave it running, checking tomorrow whether "btrfs-cleaner" calmed down.
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