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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with quota and btrfs (Rockstor forum), other sites cite the quota support in btrfs as experimental (but these might be out of date).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 ...
Short after the las reboot (the NAS was not even responding to ssh) the btrfs-cleaner restarted - taking up to 97% of CPU.
Acces to the files (via NFS) is not possible any more, even a ls never returns.
It might be related to the deletion of a snapshot (the ReadyNas-Logs were showing an according message after the reboot), but it should not be that it leaves the NAS unusable.
It never happened befor firmware 6.4.0, Usage of the NAS did not change in any way.
Unfortunately there seems to be no documentation for btrfs-cleaner and no way to find out what it's really doing ...
Hello, Netgear *knock* *knock* *knock* - any comments on this?
Regards, HansW
Well - I'm not too sure but it seems that any file-access keeps hanging and "deadlocks" with btrfs-cleaner.
The NAS did not even shutdown completely: After shutdown -r it stopped responding to ping very quickly but never switched off - and did not respond to the power-button any more.
The only way to reboot was to disconnect it from power ... :smileysad:
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