Using either the 3.91 amd64 build from the website, I compressed an ARM executable with --lzma (to get maximum compression). It then segfaults while self-decompressing.
Previously, I had encountered the same problem, but using an updated version of the lzma library helped, but it doesn't seem to help anymore.
Fixed a bug in the decompressor stub code. Changeset 2393:f05317e2e4fc at the source repository https://www.pysol.org:4443/hg/upx.hg .