Re: btrfs fails to mount on kernel 5.11.4 but works on 5.10.19

[Norbert Preining <norbert@preining.info>]

Hi

(please cc)

thanks for your email. First some additional information. Since this
happened I searched and realized that there seem to have been a problem
with 5.12-rc1, which I tried for short time (checking whether AMD-GPU
hangs are fixed). Now I read that -rc1 is a btrfs-killer. I have swap
partition, not swap file, and 64G or RAM, so normally swap is not used,
though.

Then for your email:

On Mon, 08 Mar 2021, Wang Yugui wrote:
> If this is a boot btrfs filesystem, please try to mount it manually with
> a live linux with the kernel 5.11.4?

Hmmm, good idea, but how do I get a live system with that kernel? Not
that I know any having this as default by now.

I have booted systemrescue and run now
	btrfsck --check-data-csum
to see whether there are some other errors.

> When a boot btrfs filesystem with multiple disks, I have a question for
> a little long time.

What kind of problems do you see?

> If some but not all of the disks are scaned, systemd will try to mount
> it? and then btrfs mount will try to wait other disks to be scaned?

Hmm, but nothing has changed in the underlying boot configuration
(Debian/sid). Same system only kernel changes.

(Please cc)

Thanks and all the best

Norbert

> > not sure this is the right mailing list, but I cannot boot into 5.11.4 
> > it gives me
> > 	devid 9 uui .....  
> > 	failed to read the system array: -2
> > 	open_ctree failed
> > (only partial, typed in from photo)
> > 
> > OTOH, 5.10.19 boots without a hinch
> > $ btrfs fi show /
> > Label: none  uuid: 911600cb-bd76-4299-9445-666382e8ad20
> >         Total devices 8 FS bytes used 3.28TiB
> >         devid    1 size 899.01GiB used 670.00GiB path /dev/sdb3
> >         devid    2 size 489.05GiB used 271.00GiB path /dev/sdd
> >         devid    3 size 1.82TiB used 1.58TiB path /dev/sde1
> >         devid    4 size 931.51GiB used 708.00GiB path /dev/sdf1
> >         devid    5 size 1.82TiB used 1.58TiB path /dev/sdc1
> >         devid    7 size 931.51GiB used 675.00GiB path /dev/nvme2n1p1
> >         devid    8 size 931.51GiB used 680.03GiB path /dev/nvme1n1p1
> >         devid    9 size 931.51GiB used 678.03GiB path /dev/nvme0n1p1
> > 
> > That is a multi disk array with all data duplicated data/sys:
> > 
> > $ btrfs fi us -T /
> > Overall:
> >     Device size:                   8.63TiB
> >     Device allocated:              6.76TiB
> >     Device unallocated:            1.87TiB
> >     Device missing:                  0.00B
> >     Used:                          6.57TiB
> >     Free (estimated):              1.03TiB      (min: 1.03TiB)
> >     Free (statfs, df):             1.01TiB
> >     Data ratio:                       2.00
> >     Metadata ratio:                   2.00
> >     Global reserve:              512.00MiB      (used: 0.00B)
> >     Multiple profiles:                  no
> > 
> >                   Data      Metadata System               
> > Id Path           RAID1     RAID1    RAID1     Unallocated
> > -- -------------- --------- -------- --------- -----------
> >  1 /dev/sdb3      662.00GiB  8.00GiB         -   229.01GiB
> >  2 /dev/sdd       271.00GiB        -         -     1.55TiB
> >  3 /dev/sde1        1.58TiB  7.00GiB         -   241.02GiB
> >  4 /dev/sdf1      701.00GiB  7.00GiB         -   223.51GiB
> >  5 /dev/sdc1        1.57TiB 10.00GiB         -   241.02GiB
> >  7 /dev/nvme2n1p1 675.00GiB        -         -   256.51GiB
> >  8 /dev/nvme1n1p1 673.00GiB  7.00GiB  32.00MiB   251.48GiB
> >  9 /dev/nvme0n1p1 671.00GiB  7.00GiB  32.00MiB   253.48GiB
> > -- -------------- --------- -------- --------- -----------
> >    Total            3.36TiB 23.00GiB  32.00MiB     3.21TiB
> >    Used             3.27TiB 15.70GiB 528.00KiB            
> > $
> > 
> > Is there something wrong with the filesystem? Or the kernel?
> > Any hint how to debug this?

--
PREINING Norbert                              https://www.preining.info
Fujitsu Research Labs  +  IFMGA Guide + TU Wien + TeX Live + Debian Dev
GPG: 0x860CDC13   fp: F7D8 A928 26E3 16A1 9FA0 ACF0 6CAC A448 860C DC13