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Forum Discussion

joki's avatar
joki
Tutor
Oct 08, 2015
Solved

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 ...
Installation & Upgrade
Performance
  • HansWeihnacht's avatar
    HansWeihnacht
    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with quota and btrfs (Rockstor forum), other sites cite the quota support in btrfs as experimental (but these might be out of date).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 ...

StephenB's avatar
StephenB
Guru - Experienced User
Oct 31, 2015

Try 6.4.1 beta, it has a fix for your issue.

HansWeihnacht's avatar
HansWeihnacht
Guide
Nov 01, 2015

Well, I'm not to keen on testing Beta-software on my data ...

 

I uploaded the img-file, rebooted ... and did not look at top :-(

After enbling quota i had a look at top and notticed up to three kworker processes using cpu at 60-90%, with wait at about 5, load netween 1.3 and 3.5.

 

I just wanted to check, what happens when I disable quota again - wich was not a so-good idea.

since then, the NAS is unreachable again (no ssh, no admin-page).

 

I'll leave it like that for the moment, hoping it cools down again (not beeing too optimistic).

 

PS: pings are answered - but I imagine, that's the NIC on its own.

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