     Mar 28 10:04:47 auth: Panic: file http-client-request.c: line 283 (http_client_request_unref): assertion failed: (req->refcount > 0)
    

     Mar 28 10:04:47 auth: Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0(+0xe34fb) [0x7fe76e0834fb] -> /usr/lib64/dovecot/libdovecot.so.0(+0xe3597) [0x7fe76e083597] -> /usr/lib64/dovecot/libdovecot.so.0(+0x51207) [0x7fe76dff1207] -> /usr/lib64/dovecot/libdovecot.so.0(+0x4972b) [0x7fe76dfe972b] -> /usr/lib64/dovecot/libdovecot.so.0(http_client_request_destroy+0x107) [0x7fe76e02cf87] -> /usr/lib64/dovecot/libdovecot.so.0(http_client_deinit+0x4c) [0x7fe76e03b9ec] -> dovecot/auth(auth_policy_deinit+0x1e) [0x55facfdb350e] -> dovecot/auth(main+0x3e1) [0x55facfdae3c1] -> /lib64/libc.so.6(__libc_start_main+0xf3) [0x7fe76dd93413] -> dovecot/auth(_start+0x2e) [0x55facfdae57e]
    

     Mar 28 10:04:47 auth: Fatal: master: service(auth): child 31162 killed with signal 6 (core not dumped - https://dovecot.org/bugreport.html#coredumps - set /proc/sys/fs/suid_dumpable to 2)
    

     Mar 28 10:04:48 master: Info: Dovecot v2.3.3 (dcead646b) starting up for imap, pop3
    