Comment # 2 on bug 1193852 from
looks like none of the btrfs lzo fixes (including memory leak fixes) have been
added to 5.14. likely candidates to fix this are 

commit ccaa66c8dd277ac02f96914168bb7177f7ea8117
Author: David Sterba <dsterba@suse.com>
Date:   Wed Oct 27 10:44:21 2021 +0200

    Revert "btrfs: compression: drop kmap/kunmap from lzo"

    This reverts commit 8c945d32e60427cbc0859cf7045bbe6196bb03d8.

    The kmaps in compression code are still needed and cause crashes on
    32bit machines (ARM, x86). Reproducible eg. by running fstest btrfs/004
    with enabled LZO or ZSTD compression.


and the followon commits from Linus Torvals and Qu Wenruo


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