Cyrmaster at 100% cpu, defunct processes, connection timeouts

Hello everybody

yesterday evening I have update a server with ubuntu 18.04 (just the routine 
security update, libc, kernel, not cyrus), and after reboot cyrus fails in 
quite strange way.

It works fine for a few minutes, but then the cyrmaster spins up to 100% cpu 
(1-core), and stops receiving new connections. Processes that exit stay in 
defunct/zombie state, and eventually all of them end up like that.

At first I suspected some SSL problems, so eptied the tls_sessions.db, even set 
tls_session_timeout: 0, tried to disable mailnotifier (I had it at log), 
enabled debug, but still can't find the problem. 

Anybody has/had the same problem and perhaps a solution?

Best regards
Vladislav Kurz
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