Created attachment 812481 [details]
open_ctree_failed error on boot

Dear all,

after a recent update in openSUSE LEAP 15.1 a server failed to boot with
"open_ctree failed" (See attachment).
I was able to resolve this issue by booting into the system without the
corresponding device and run a 'btrfs device check' on that device. After that
I was able to mount the system again, but it's now horribly slow:

I have btrfs on an ARECA Hardware RAID for a 70 TiB filesystem. The system is
about 70% full.
btrfs is working ON the hardware RAID, no btrfs RAID functions are used in this
system.
The boot procedure of the filesystem failed without any useful information
(after resolving the "open_ctree" failed issue). I was able to boot into the
system by disabling the 70 TiB system in /etc/fstab.
After booting I could manually mount the system, but mounting and unmounting
took horribly long. Long as in more than 5 minutes:


    eso-storage:/ # time mount /dev/sdb1 /RAID

    real    5m37.123s
    user    0m0.001s
    sys    0m6.102


This explains, why the boot procedure fails, because it takes more than 4:30
minutes, which is displayed to be the timeout.
Still, a mount of a rather large filesystem that takes more than 5 minutes
seems to be a bit fishy.


Using openSUSE LEAP 15.1 with all installed updated on Kernel
4.12.14-lp151.28.10-default. Here are some details about the filesystems:

    /dev/sda  is the system ssd
    /dev/sdb  is the ARECA RAID

The filesystem has been created with `mkfs.btrfs` using the default settings.



# lsblk

/dev/sda1: UUID="36AC-53E1" TYPE="vfat"
PARTUUID="b45ecebb-24f0-481a-9223-a2cde070ddab"
/dev/sda2: UUID="ba1a7010-f9cd-42b3-801d-9e64f0f85352"
UUID_SUB="9b7c4815-9db1-45c5-abc3-f77287901e1f" TYPE="btrfs" PTTYPE="dos"
PARTUUID="fd92a855-ead4-491c-9f3b-e646a9020e2a"
/dev/sdb1: UUID="ef07c50a-4759-484c-930d-e8bac9f673e9"
UUID_SUB="0740289c-156b-4317-b807-d2de1906318c" TYPE="btrfs"
PARTUUID="fbe19045-6d19-4201-81b7-c908abc3cef2"

# btrfs filesystem show

Label: none  uuid: ba1a7010-f9cd-42b3-801d-9e64f0f85352
    Total devices 1 FS bytes used 3.57GiB
    devid    1 size 50.00GiB used 4.53GiB path /dev/sda2

Label: none  uuid: ef07c50a-4759-484c-930d-e8bac9f673e9
    Total devices 1 FS bytes used 76.83TiB
    devid    1 size 98.22TiB used 76.94TiB path /dev/sdb1


Greetings,
Felix