https://bugzilla.suse.com/show_bug.cgi?id=1193852
https://bugzilla.suse.com/show_bug.cgi?id=1193852#c2
--- Comment #2 from Dirk Mueller ---
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
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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