My dovecot have crashed twice in last month:

System is FC4 AMD64 2.6.11-1.1369_FC4

/var/log/messages pop3-login[9545]: segfault at 0000000000000000 rip 0000003bb6d009e0 rsp 00007fffff813720 error 6 /var/log/dovecot dovecot: Feb 24 23:17:47 Error: child 9545 (login) killed with signal 11 dovecot: Feb 24 23:17:47 Error: Login process died too early - shutting down File system type is XFS, dovecot version is dovecot-1.0.beta3