tw1:~ # vgcreate --shared vgtest /dev/vdb 
    Using a shared lock type requires lvmlockd.
    Failed to detect a running lock manager to select lock type.


(gdb) bt
#0  lockd_running_lock_type (cmd=0x555555b8bfa0, found_multiple=<synthetic
pointer>)
    at ../include/lvmlockd.h:228
#1  vgcreate_params_set_from_args (cmd=cmd@entry=0x555555b8bfa0,
vp_new=vp_new@entry=0x7fffffffddf0, 
    vp_def=vp_def@entry=0x7fffffffde40) at toollib.c:950
#2  0x00005555555c42ac in vgcreate (cmd=0x555555b8bfa0, argc=<optimized out>,
argv=0x7fffffffe380)
    at vgcreate.c:55
#3  0x00005555555a604f in lvm_run_command (cmd=cmd@entry=0x555555b8bfa0,
argc=<optimized out>, argc@entry=4, 
    argv=<optimized out>, argv@entry=0x7fffffffe368) at lvmcmdline.c:2928
#4  0x00005555555a6d15 in lvm2_main (argc=4, argv=0x7fffffffe368) at
lvmcmdline.c:3454
#5  0x00007ffff6b31541 in __libc_start_main () from /lib64/libc.so.6
#6  0x000055555558697a in _start () at ../sysdeps/x86_64/start.S:120
(gdb) list
223        return 1;
224    }
225    
226    static inline const char *lockd_running_lock_type(struct cmd_context
*cmd, int *found_multiple)
227    {
228        log_error("Using a shared lock type requires lvmlockd.");
229        return NULL;
230    }