Btrfs warning on boot: failed to load free space cache for block group

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1

I notice there are btrfs warning during boot.

$sudo journalctl --boot | grep -i btrfs
Jan 16 23:13:51 sony.lan kernel: Btrfs loaded, crc32c=crc32c-generic
Jan 16 23:13:51 sony.lan dracut-cmdline[202]: Using kernel command line parameters: rd.driver.pre=btrfs BOOT_IMAGE=(hd0,msdos1)/boot/vmlinuz-5.10.7-200.fc33.x86_64 root=UUID=748707ec-2c07-4e24-b2d9-5d7c0386d212 ro rootflags=subvol=root
Jan 16 23:13:54 sony.lan kernel: BTRFS: device label fedora_fedora devid 1 transid 7949 /dev/sda1 scanned by systemd-udevd (270)
Jan 16 23:13:56 sony.lan kernel: BTRFS info (device sda1): disk space caching is enabled
Jan 16 23:13:56 sony.lan kernel: BTRFS info (device sda1): has skinny extents
Jan 16 23:14:10 sony.lan kernel: BTRFS info (device sda1): disk space caching is enabled
Jan 16 23:15:23 sony.lan kernel: BTRFS warning (device sda1): block group 2177892352 has wrong amount of free space
Jan 16 23:15:23 sony.lan kernel: BTRFS warning (device sda1): failed to load free space cache for block group 2177892352, rebuilding it now

I will wait for the auto rebuild to complete. Just that how can I check the rebuild progress? How long it will take?

2

Seconds.

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3

Thank you for replying.

I just finished rebooting that machine, and this time the error is gone.

4

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