System hang when mounting btrfs

Asked May 12 '17 at 13:43

Active May 15 '17 at 06:55

Viewed 724 times

I have a btrfs filesystem that includes 3 disks in raid0:

 # btrfs fi show /dev/sdb1 
 Label: 'disco_backup'  uuid: 10726648-202c-4792-82d4-5d0911cce762
         Total devices 3 FS bytes used 8.05TiB
         devid    1 size 3.64TiB used 3.64TiB path /dev/sdb1
         devid    2 size 2.73TiB used 2.73TiB path /dev/sdd1
         devid    3 size 1.82TiB used 1.82TiB path /dev/sdc1

I uses it as backup. I have a subvolume for the backup and each new backup is a snapshot of the previous one and is updated by rsync.

The filesystem was nearly full. I deleted some snapshots but the disk space was not updated. Then I enabled quotas on the disk for viewing the used space:

# btrfs quota enable /mnt/bacup

When I did this after a few minutes the system hanged (I think due to out of memory). After this, I has not been able to mount the disk. Every time I try to mount it the system hangs.

I added many swap space (300Gb) but it stills hang when mounting. I tried running btrfsck but it does not report errors.

Kernel 4.4.59

btrfs-progs 4.4.1

Any help please?

edited May 15 '17 at 06:55

asked May 12 '17 at 13:43

user3099887

This is really a bad asked question, with no information about the distribution and used kernel version whatsoever. – Marc Stürmer May 13 '17 at 09:06
Added version info Kernel 4.4.59 btrfs-progs 4.4.1 – user3099887 May 15 '17 at 06:55
Try using a decent kernel like 4.10 at least, Btrfs had a nasty quota bug in those lower kernel versions and look for yourself how it turns out. – Marc Stürmer May 27 '17 at 08:36
No screenshots of your terminals. Copy the text to the question and use the code formatting option. – kasperd May 28 '17 at 17:55
@MarcStürmer Do you have any links to that quota bug? Think I might be running into it. – antonagestam Sep 26 '18 at 19:35

System hang when mounting btrfs

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