I'm not sure it's a neomutt bug or openbsd specific.
It can be reproduced reliably.
I have an imap server with a SSL certificate.
If I make a ssh tunnel to forward it locally and that I connect to it through
localhost, SSL certificate is wrong (due to different hostname).
neomutt asks for rejection or accepting it once.
If I reject it, neomutt crashes:
egdb output:
Program received signal SIGBUS, Bus error.
0x000008c304af4a3b in SSL_shutdown
(s=0xdfdfdfdfdfdfdfdf) at /usr/src/lib/libssl/ssl_lib.c:1001
1001 if (s->internal->handshake_func == NULL) {
(gdb) bt
#0 0x000008c304af4a3b in SSL_shutdown (s=0xdfdfdfdfdfdfdfdf) at
/usr/src/lib/libssl/ssl_lib.c:1001
#1 0x000008c019ce03ff in ssl_socket_close (conn=0x8c2eeca4000) at
../neomutt-neomutt-20180716/conn/ssl.c:385
#2 ssl_socket_close_and_restore (conn=0x8c2eeca4000) at
../neomutt-neomutt-20180716/conn/ssl.c:710
#3 0x000008c019cdcd0e in mutt_socket_close (conn=0x8c2eeca4000) at
../neomutt-neomutt-20180716/conn/socket.c:127
#4 0x000008c019cd1442 in imap_close_connection (idata=<optimized out>) at
../neomutt-neomutt-20180716/imap/imap.c:1103
#5 imap_open_connection (idata=0x8c22d01d800) at
../neomutt-neomutt-20180716/imap/imap.c:1088
#6 0x000008c019cd06c3 in imap_conn_find (account=0x7f7ffffcfa30, flags=2) at
../neomutt-neomutt-20180716/imap/imap.c:970
#7 0x000008c019cd498e in imap_mbox_open (ctx=0x8c30d7e5000) at
../neomutt-neomutt-20180716/imap/imap.c:1998
#8 0x000008c019c693ad in mx_mbox_open (path=<optimized out>, flags=0,
pctx=0x0) at ../neomutt-neomutt-20180716/mx.c:513
#9 0x000008c019c57e11 in main (argc=1, argv=0x7f7ffffd0c58, envp=<optimized
out>) at ../neomutt-neomutt-20180716/main.c:1101
