[Dovecot] 2.1.2 (pop3|imap)-login crash

[Luca Palazzo]

Hi Timo, hi all,
after upgrading my server (both backends and load balancer) to 2.1.2 
(from 2.0.17), I'm getting a log of login processes crashed in load 
balancer.

Log lines are like:

Mar 20 10:05:45 mailgw-lb dovecot: pop3-login: Fatal: master: 
service(pop3-login): child 27764 killed with signal 11 (core dumps disabled)
Mar 20 10:06:17 mailgw-lb dovecot: imap-login: Fatal: master: 
service(imap-login): child 28468 killed with signal 11 (core dumps disabled)

Stack trace of a crashed process is like:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1220163904 (LWP 27764)]
0xb77cd176 in ssl_proxy_is_handshaked (proxy=0x0) at ssl-proxy-openssl.c:710
710     {
(gdb) bt
#0  0xb77cd176 in ssl_proxy_is_handshaked (proxy=0x0) at 
ssl-proxy-openssl.c:710
#1  0xb77c7295 in client_get_log_str (client=0x807b830, msg=0x804e290 
"proxy(aaaaaa at dddddd.it): disconnecting x.x.x.x (Disconnected by 
server)") at client-common.c:469
#2  0xb77c73c6 in client_log (client=0x807b830, msg=0x804e290 
"proxy(aaaaaaa at dddddd.it): disconnecting x.x.x.x (Disconnected by 
server)") at client-common.c:553
#3  0xb77c9a45 in login_proxy_free_reason (_proxy=<value optimized out>, 
reason=0x804e248 "Disconnected by server") at login-proxy.c:373
#4  0xb77ca9b5 in server_input (proxy=0x0) at login-proxy.c:93
#5  0xb7793762 in io_loop_call_io (io=0x8094180) at ioloop.c:380
#6  0xb7794cc9 in io_loop_handler_run (ioloop=0x8055480) at 
ioloop-epoll.c:213
#7  0xb77936f9 in io_loop_run (ioloop=0x8055480) at ioloop.c:399
#8  0xb777e4c8 in master_service_run (service=0x80553b0, 
callback=0xb77cc110 <client_connected>) at master-service.c:544
#9  0xb77cbcee in login_binary_run (binary=0x804ad80, argc=2, 
argv=0x80551c0) at main.c:406
#10 0x08049812 in main (argc=0, argv=0x0) at client.c:303

The strange part of the story is that not all process crash. I'm trying 
to figure out if only TLS/SSL process crash.

Any idea?

Thanks

Luca