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</head><body><p>Hello.<br></p><blockquote type="cite">Vanilla Cyrus, no Xapian. I don't know how to run a debug-enable, I only know the basics :/<p>ii cyrus-imapd 2.5.10-3+deb9u1 amd64 Cyrus mail system - IMAP support</p></blockquote><p>There seems to be an open issue: <a href="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=871921">https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=871921</a><br></p><p>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?<br></p><p>How about system's ulimit? Can the cyrus user open enough files?<br></p><p>Paolo<br></p><p><br></p><p class="default-style"></p></body></html>