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Forum Discussion
btrfs-cleaner always stuck at 100% CPU after 6.4.0 upgrade
Hello, After 6.4.0 upgrade btrfs-cleaner process always uses 100% cpu even after many uptime hours. SMB shares are ok (but slow) Frontview times out after authentication. Top command (ssh i...
I'm also unable to use the NAS, although it appears to be fully booted. I just ssh'd in to check it out. Indeed, btrfs-cleaner is (apparently) hard at work.
In my case, if I wait for about 90 minutes after boot, the NAS becomes usable again. I suspect the btrfs-cleaner process will not be active at that point. I will confirm in about an hour (hopefully).
UPDATE: As suspected, when btrfs-cleaner stopped, the NAS became fully usable. Also, I did an immediate reboot to see if btrfs-cleaner would go wild again - it didn't. The NAS seems to be working normally for now.
Thanks for the info, I have had the box with the cleaner stopped but as soon as I touch the filesystem it's off again. It must think I'm really dirty to need to spend all day cleaning. I have about 6TB of data.
I'm trying to clean up and delete old snapshots but ever one I delete freezes my NAS for a good 10 minutes +
I'm not seeing that same symptom, where touching the filesystem sets off btrfs-cleaner again. I've been using the NAS all morning (since btrfs-cleaner stopped) without incident. I'm keeping an eye on a running top command, just to see if it pops in there again, but so far it's OK.
This wouldn't be the first time I had the NAS go from unusable to usable since 6.4.0. I've had it do this a few times now. This time is different, however; it's remained usable through reboot. I did try the USB recovery and that kept it from happening through one reboot. I want to reboot again, to see if it continues to be usable, but I have work to do, so that will have to wait until later today.
@I wrote:
I want to reboot again, to see if it continues to be usable, but I have work to do, so that will have to wait until later today.
So I booted it up this morning, as per usual. btrfs-cleaner is at it again and the NAS is unusable... again.
Finally I think my btrfs-cleaner has stopped.
It could just be because I had 5TB of data that it took ages to munge through, or it could be the fact that I deleted all my snapshots that has stopped it. Maybe we just need to be a little more patient?
This upgrade is giving me a terrible headache. Is there a way to disable btrfs-cleaner temporarily until there is a fix?
The NAS is completely useless now, especially for NFS conntections to my VMware cluster. NFS is unavailable most of the time during the cleaner causing my VM's to remount filesystems read-only.
Please fix this as soon as possible Netgear!
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