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Forum Discussion
joki
Oct 08, 2015Tutor
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 ...
- Oct 21, 2015
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with quota and btrfs (Rockstor forum), other sites cite the quota support in btrfs as experimental (but these might be out of date).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 ...
nybblesandbytes
Dec 07, 2015Star
Apparently 6.4.1 is now out and has fixed this issue...
Airat
Dec 23, 2015Aspirant
Upgraded to 6.4.1
Btrfscleaner stopped using 100% cpu but now I have kworker/u4:4 using 98% or more
And one of the volumes shows Calculating instead of free space
- nybblesandbytesDec 23, 2015Star
Hi Airat,
Sorry to hear that...
6.4.1 also fixed my btrfs-cleaner issue, but I have not encountered the kworker process issue that you are having...
So far, 6.4.1 seems stable on my side, but I am keeping an eye on it and will watch the kworker process as well.
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