Hello.
Vanilla Cyrus, no Xapian. I don't know how to run a debug-enable, I only know the basics :/ii cyrus-imapd 2.5.10-3+deb9u1 amd64 Cyrus mail system - IMAP support
There seems to be an open issue: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=871921
I've seen squatter segfaulting when the index file got too large (in an older Cyrus version). Can you check how large it is? How many messages are in the mailbox/folder causing the crash?
How about system's ulimit? Can the cyrus user open enough files?
Paolo
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