mariadb-backup segfault on 10.4.8 and 11.4.2 (11.4.7 is fine), under Alpine 3.20

So, first off compiling under Alpine using musl instead of libc requires a few trivial patches (attached).

Secondly, running under 10.11.7 works 100%, no issues. It seems whatever changes were introduced in 10.11.8 break mariadb-backup. I'll try bisect and figure out which commit it was.

Testing on 10.11.7 vs. 10.11.8 is probably the easiest. I've attached the patches for these, the MaraiDB patches are versioned, there is one LFS64 patch that changes between 10.11 and 11.4.

Backtrace attached bt.txt.

Possibly also related to this report against the official Alpine repo 11.4.2 ... https://lists.alpinelinux.org/~alpine/devel/%3CCAKzsc6fAuXaOX4ptx8MacfycGo3RjATcwyv6vEgKKOBdB%3DU9rw%40mail.gmail.com%3E