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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with quota and btrfs (Rockstor forum), other sites cite the quota support in btrfs as experimental (but these might be out of date).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 ...
This has started happening with my RN316, also after the 6.4.0 upgrade. In my case, the activity seems to be triggered by any attempt to use the Plex server app, although that could also be coincidental. Logging in with ssh, top shows btrfs-cleaner maxed out at 99/100%, starving any other processes of CPU time. Admin page becomes unresponsive, and attempts to contact the plex app stall. A few times it has died down by itself after 5/10 minutes or so, twice it's gone on for a lot longer and I've given up and rebooted. It has happened at various times of the day, late evening, now happening before lunch.
Even if the process is going through and cleaning up after snapshots, should it really be able to max out the CPU, and prevent other processes from running?
Cheers,
Andrew
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