$:~ > gdb /usr/bin/ssh
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Reading symbols from /usr/bin/ssh...Reading symbols from /usr/lib64/debug//usr/bin/ssh.debug...done.
done.
(gdb) run hidden.tld
Starting program: /usr/bin/ssh hidden.tld
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x0000555555590575 in record_hostkey (l=l@entry=0x7fffffff6bc0, _ctx=_ctx@entry=0x7fffffffad00) at hostfile.c:258
258             hostkeys->entries[hostkeys->num_entries].host = xstrdup(ctx->host);
(gdb) bt
#0  0x0000555555590575 in record_hostkey (l=l@entry=0x7fffffff6bc0, _ctx=_ctx@entry=0x7fffffffad00) at hostfile.c:258
#1  0x0000555555591364 in hostkeys_foreach (path=path@entry=0x5555558176b0 "/home/user/.ssh/known_hosts", callback=callback@entry=0x5555555904d0 <record_hostkey>, ctx=ctx@entry=0x7fffffffad00, host=host@entry=0x5555558177c0 "xx.xx.xx.xx", ip=ip@entry=0x0,
    options=options@entry=3) at hostfile.c:850
#2  0x00005555555918ce in load_hostkeys (hostkeys=hostkeys@entry=0x55555581d4d0, host=0x5555558177c0 "xx.xx.xx.xx", path=0x5555558176b0 "/home/jona/.ssh/known_hosts") at hostfile.c:280
#3  0x0000555555572f28 in order_hostkeyalgs (port=<optimized out>, hostaddr=<optimized out>, host=0x555555804630 <options+528> "`\353\201UUU") at sshconnect2.c:123
#4  ssh_kex2 (host=host@entry=0x55555580aa90 "xx.xx.xx.xx", hostaddr=hostaddr@entry=0x555555806320 <hostaddr>, port=port@entry=22) at sshconnect2.c:202
#5  0x00005555555704b3 in ssh_login (sensitive=0x5555558063a0 <sensitive_data>, orighost=<optimized out>, hostaddr=0x555555806320 <hostaddr>, port=<optimized out>, pw=<optimized out>, timeout_ms=-1000) at sshconnect.c:1464
#6  0x000055555555f50c in main (ac=<optimized out>, av=<optimized out>) at ssh.c:1433