Hi again I dug deeper, and I can now reproduce the crash on x86_64 as well.
It boils down to the content of dovecot-virtual. ~/.Mail/virtual$ cat test/dovecot-virtual Tous les messages OR (INTHREAD REFS YOUNGER 100) (YOUNGER 100) If I select the test folder, dovecot-imapd crashes. "OR (YOUNGER 100) (YOUNGER 100)" and "INTHREAD REFS YOUNGER 100" don't trigger it, however. Thanks -- Sylvain