On 2020-09-10, Jussi Laako <ju...@sonarnerd.net> wrote:
> 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
>
>

Which (if any) syspatches do you have - if not all of them, does that
help?

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