OpenIndiana Distribution

I confirm the bug. In almost every user directory, one can find a "core" file
created by gnome-keyring-daemon.

Also, error messages are written to the boot console and to /var/adm/messages,
especially:

        gnome-keyring-daemon : could't allocate secure memory to keep passwords

Secure memory support is not implemented on illumos, the warning might be disabled in GNOME keyring.

I also got a similar coredump (notice how mutex_destroy() called with a NULL pointer):

domag@openindiana:~$ mdb core
Loading modules: [ libc.so.1 ld.so.1 ]
> $C
00007fffbffff750 libc.so.1`mutex_destroy+0x11(0)
00007fffbffff770 libglib-2.0.so.0.6600.8`g_mutex_clear+0x14()
00007fffbffff790 gkd_ssh_agent_preload_finalize+0x71()
00007fffbffff7d0 libgobject-2.0.so.0.6600.8`g_object_unref+0x20e()
00007fffbffff7f0 gkd_ssh_agent_service_finalize+0x38()
00007fffbffff830 libgobject-2.0.so.0.6600.8`g_object_unref+0x20e()
00007fffbffff860 egg_cleanup_perform+0x37()
00007fffbffff8d0 main+0x2f1()
00007fffbffff900 _start_crt+0x83()
00007fffbffff910 _start+0x18()
> ::status
debugging core file of gnome-keyring-d (64-bit) from openindiana
file: /usr/bin/gnome-keyring-daemon
initial argv: gnome-keyring-daemon --start
threading model: native threads
status: process terminated by SIGSEGV (Segmentation Fault), addr=4
> ::quit

domag@openindiana:~$ uname -a
SunOS openindiana 5.11 illumos-789b2662f9 i86pc i386 i86pc
domag@openindiana:~$ 

I think this happens because g_mutex_clear() called on an uninitialized "GMutex" in function gkd_ssh_agent_preload_finalize().
This modification might fix this issue:
(I haven't tested this.)

 static void
 gkd_ssh_agent_preload_init (GkdSshAgentPreload *self)
 {
+    g_mutex_init (&self->lock);
     self->keys_by_public_filename = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
     self->keys_by_public_key = g_hash_table_new_full (g_bytes_hash, g_bytes_equal, NULL, gkd_ssh_agent_key_info_free);
 } 

This issue also tracked on GNOME Gitlab:
Issue 65: gnome-keyring-daemon crashes on exit

I also opened a merge request to integrate this fix:
Merge request 45: ssh-agent: Fix crash by uninitialized GMutex