Created attachment 862780 [details]
kernel crash and detail infos of the filesystem

a full btrfs balance leads reproducably to a kernel crash (on kernel
5.14.21-150400.24.28-default, 5.14.21-150400.24.18-default) and afterwards to a
readonly filesystem. A reboot is necessary to get a writable filesystem again.

Interesting is, that balances are running, if executed with steps (with musage
or dusage)
scrubs doesn't show any errors on the filesystem.

The only problem could be that internal space is almost full, if i interpret
the output correctly:
Label: 'boot1'  uuid: 42e9a4d7-878e-457a-ab99-98106b1b556c
        Total devices 1 FS bytes used 724.80MiB
        devid    1 size 1.00GiB used 927.00MiB path /dev/mapper/system-boot1
But i can't reduce the space with the incremental balances.