Hello, this is a fix for github issue #41. I tested on system with vpmem with ndctl 64.1 that the issue is fixed. master builds with the fix applied. 8<-------------------------------------------------------------------->8 The kernel always creates zero length namespace with uuid 0 in each region. When processing all namespaces the user gets confusing errors from ndctl trying to process this namespace. Skip it. The user can still specify the namespace by name directly in case processing it is desirable. Fixes: #41 Signed-off-by: Michal Suchanek <msuchanek(a)suse.de&gt; --- ndctl/namespace.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/ndctl/namespace.c b/ndctl/namespace.c index 0550580707e8..6f4a4b5b8883 100644 --- a/ndctl/namespace.c +++ b/ndctl/namespace.c @@ -2128,9 +2128,19 @@ static int do_xaction_namespace(const char *namespace, ndctl_namespace_foreach_safe(region, ndns, _n) { ndns_name = ndctl_namespace_get_devname(ndns); - if (strcmp(namespace, "all") != 0 - && strcmp(namespace, ndns_name) != 0) - continue; + if (strcmp(namespace, "all") == 0) { + static const uuid_t zero_uuid; + uuid_t uuid; + + ndctl_namespace_get_uuid(ndns, uuid); + if (!ndctl_namespace_get_size(ndns) && + !memcmp(uuid, zero_uuid, sizeof(uuid_t))) + continue; + } else { + if (strcmp(namespace, ndns_name) != 0) + continue; + } + switch (action) { case ACTION_DISABLE: rc = ndctl_namespace_disable_safe(ndns);