Hello,
looking at the journals of three different machines running btrfs on
crypt-devices on SSDs for root (dm-0 in the logs below) and other
volumes, I'm seeing space cache warnings recurring for the same blocks
over and over again. The machines are usually (re)booted once a day. See
below for excerpts from the journals of the three machines. It is
striking that these warnings seem to start somewhere around April/May. I
thought maybe it is worth pointing out before I try something else like
resetting the space cache manually. I've been using the 4.10.* series
kernel on all machines for quite a while now (it's a routinely updated
Arch Linux). Currently installed btrfs-progs are 4.10.2.
Mai 19 08:57:45 machine0 kernel: BTRFS warning (device dm-0): block
group 6471811072 has wrong amount of free space
Mai 19 08:57:45 machine0 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 6471811072, rebuilding it now
Mai 18 10:00:26 machine0 kernel: BTRFS warning (device dm-0): block
group 6471811072 has wrong amount of free space
Mai 18 10:00:26 machine0 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 6471811072, rebuilding it now
Mai 18 10:00:26 machine0 kernel: BTRFS warning (device dm-0): block
group 105256058880 has wrong amount of free space
Mai 18 10:00:26 machine0 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 105256058880, rebuilding it now
Mai 17 14:57:00 machine0 kernel: BTRFS warning (device dm-0): block
group 6471811072 has wrong amount of free space
Mai 17 14:57:00 machine0 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 6471811072, rebuilding it now
Mai 17 09:08:09 machine0 kernel: BTRFS warning (device dm-0): block
group 6471811072 has wrong amount of free space
Mai 17 09:08:09 machine0 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 6471811072, rebuilding it now
Mai 16 11:41:42 machine0 kernel: BTRFS warning (device dm-0): block
group 6471811072 has wrong amount of free space
Mai 16 11:41:42 machine0 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 6471811072, rebuilding it now
Mai 16 11:41:43 machine0 kernel: BTRFS warning (device dm-0): block
group 105256058880 has wrong amount of free space
Mai 16 11:41:43 machine0 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 105256058880, rebuilding it now
Mai 03 16:46:48 machine0 kernel: BTRFS warning (device dm-0): block
group 53179580416 has wrong amount of free space
Mai 03 16:46:48 machine0 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 53179580416, rebuilding it now
Apr 26 20:06:27 machine1 kernel: BTRFS warning (device dm-0): block
group 31159484416 has wrong amount of free space
Apr 26 20:06:27 machine1 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 31159484416, rebuilding it now
Apr 27 18:46:19 machine1 kernel: BTRFS warning (device dm-0): block
group 31159484416 has wrong amount of free space
Apr 27 18:46:19 machine1 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 31159484416, rebuilding it now
Apr 29 00:00:10 machine1 kernel: BTRFS warning (device dm-0): block
group 31159484416 has wrong amount of free space
Apr 29 00:00:10 machine1 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 31159484416, rebuilding it now
Apr 30 00:01:07 machine1 kernel: BTRFS warning (device dm-0): block
group 31159484416 has wrong amount of free space
Apr 30 00:01:07 machine1 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 31159484416, rebuilding it now
Mai 01 18:05:25 machine1 kernel: BTRFS warning (device dm-0): block
group 31159484416 has wrong amount of free space
Mai 01 18:05:25 machine1 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 31159484416, rebuilding it now
Mai 02 23:17:05 machine1 kernel: BTRFS warning (device dm-0): block
group 31159484416 has wrong amount of free space
Mai 02 23:17:05 machine1 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 31159484416, rebuilding it now
Mai 03 22:47:08 machine1 kernel: BTRFS warning (device dm-0): block
group 31159484416 has wrong amount of free space
Mai 03 22:47:08 machine1 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 31159484416, rebuilding it now
Mai 04 22:05:59 machine1 kernel: BTRFS warning (device dm-0): block
group 31159484416 has wrong amount of free space
Mai 04 22:05:59 machine1 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 31159484416, rebuilding it now
Mai 17 17:53:39 machine1 kernel: BTRFS warning (device dm-0): block
group 8610906112 has wrong amount of free space
Mai 17 17:53:39 machine1 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 8610906112, rebuilding it now
Mai 17 17:55:03 machine1 kernel: BTRFS warning (device dm-0): block
group 8610906112 has wrong amount of free space
Mai 17 17:55:03 machine1 kernel: BTRFS warning (device dm-0): failed to
load free space cache for block group 8610906112, rebuilding it now
Mai 15 07:15:56 machine2 kernel: BTRFS info (device dm-0): The free
space cache file (99006545920) is invalid. skip it
Mai 18 00:00:05 machine2 kernel: BTRFS info (device dm-0): The free
space cache file (99006545920) is invalid. skip it
Best regards
Sebastian
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