$ redis-cli --rdb -
Could not connect to Redis at 127.0.0.1:6379: Connection refused
[1]    22234 segmentation fault (core dumped)  redis-cli --rdb -

$ gdb redis-cli core.redis.cli.22234
[...]
#0  0x0000000000407495 in getRDB () at redis-cli.c:1001
1001        int s = context->fd;
(gdb) bt
#0  0x0000000000407495 in getRDB () at redis-cli.c:1001
#1  0x0000000000408159 in main (argc=0, argv=0x7fff2615cdb0) at redis-cli.c:1304