[ports] Bug in Alpine TLS patch applied in 6.7 (ports/mail/alpine)

Hi,

I had a problem that with Thunderbird / mobile clients accessing
alpine-based imapd server (imap-uw) over SSL/TLS, eventually the imapd
server process goes into busy-loop consuming all possible CPU time.
After a while the server was crawling with some tens or hundreds of
busy-looping imapd processes.

I found out that this is caused by the TLS patch that was added in 6.7
with header "Add workarounds to fix alpine with TLSv1.3". Involving
following patch:
patch-imap_src_osdep_unix_ssl_unix_c

Removing this patch makes the problem go away. So I have to conclude
there's a problem in this patch. I suspect it may be related to
connection termination time. But I don't know enough about this TLS
implementation and API to know how to fix this.


Best regards,

- Jussi