Error: [EFAULT] Kubernetes service is not running.

Hope it helps...

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truenas# systemctl start k3s
Job for k3s.service failed because the control process exited with error code.
See "systemctl status k3s.service" and "journalctl -xe" for details.
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truenas# journalctl -xe              
░░ 
░░ The job identifier is 9880 and the job result is done.
Feb 16 18:03:21 truenas.local systemd[1]: Starting Lightweight Kubernetes...
░░ Subject: A start job for unit k3s.service has begun execution
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░ 
░░ A start job for unit k3s.service has begun execution.
░░ 
░░ The job identifier is 9880.
Feb 16 18:03:21 truenas.local k3s[50997]: time="2021-02-16T18:03:21.328821161-08:00" level=info msg="Starting k3s TS-21.02-ALPHA.1 (0f579eab)"
Feb 16 18:03:21 truenas.local k3s[50997]: time="2021-02-16T18:03:21.329274274-08:00" level=info msg="Cluster bootstrap already complete"
Feb 16 18:03:21 truenas.local k3s[50997]: time="2021-02-16T18:03:21.365954946-08:00" level=info msg="Configuring sqlite3 database connection pooling: maxIdleConns=2, maxOpenConns=0, connMaxLifetime=0s"
Feb 16 18:03:21 truenas.local k3s[50997]: time="2021-02-16T18:03:21.366009673-08:00" level=info msg="Configuring database table schema and indexes, this may take a moment..."
Feb 16 18:03:21 truenas.local k3s[50997]: time="2021-02-16T18:03:21.366162231-08:00" level=info msg="Database tables and indexes are up to date"
Feb 16 18:03:21 truenas.local k3s[50997]: time="2021-02-16T18:03:21.368200404-08:00" level=info msg="Kine listening on unix://kine.sock"
Feb 16 18:03:21 truenas.local k3s[50997]: time="2021-02-16T18:03:21.368611532-08:00" level=info msg="Running kube-apiserver --advertise-address=0.0.0.0 --advertise-port=6443 --allow-privileged=true --anonymous-auth=false --api-audiences=unknown --authorization-mode=Node,RBAC --bind-address=127.0.0.1 --cert-dir=/mnt/pookie/ix-applications/k3s/server/tls/tempora>
Feb 16 18:03:21 truenas.local k3s[50997]: Flag --insecure-port has been deprecated, This flag has no effect now and will be removed in v1.24.
Feb 16 18:03:21 truenas.local k3s[50997]: I0216 18:03:21.370719   50997 server.go:659] external host was not specified, using 192.168.1.225
Feb 16 18:03:21 truenas.local k3s[50997]: I0216 18:03:21.371194   50997 server.go:196] Version: v1.20.2-k3s1
Feb 16 18:03:21 truenas.local k3s[50997]: I0216 18:03:21.376713   50997 shared_informer.go:240] Waiting for caches to sync for node_authorizer
Feb 16 18:03:21 truenas.local k3s[50997]: I0216 18:03:21.378279   50997 plugins.go:158] Loaded 12 mutating admission controller(s) successfully in the following order: NamespaceLifecycle,LimitRanger,ServiceAccount,NodeRestriction,TaintNodesByCondition,Priority,DefaultTolerationSeconds,DefaultStorageClass,StorageObjectInUseProtection,RuntimeClass,DefaultIngress>
Feb 16 18:03:21 truenas.local k3s[50997]: I0216 18:03:21.378302   50997 plugins.go:161] Loaded 10 validating admission controller(s) successfully in the following order: LimitRanger,ServiceAccount,Priority,PersistentVolumeClaimResize,RuntimeClass,CertificateApproval,CertificateSigning,CertificateSubjectRestriction,ValidatingAdmissionWebhook,ResourceQuota.
Feb 16 18:03:21 truenas.local k3s[50997]: I0216 18:03:21.379920   50997 plugins.go:158] Loaded 12 mutating admission controller(s) successfully in the following order: NamespaceLifecycle,LimitRanger,ServiceAccount,NodeRestriction,TaintNodesByCondition,Priority,DefaultTolerationSeconds,DefaultStorageClass,StorageObjectInUseProtection,RuntimeClass,DefaultIngress>
Feb 16 18:03:21 truenas.local k3s[50997]: I0216 18:03:21.379945   50997 plugins.go:161] Loaded 10 validating admission controller(s) successfully in the following order: LimitRanger,ServiceAccount,Priority,PersistentVolumeClaimResize,RuntimeClass,CertificateApproval,CertificateSigning,CertificateSubjectRestriction,ValidatingAdmissionWebhook,ResourceQuota.
Feb 16 18:03:21 truenas.local k3s[50997]: I0216 18:03:21.418548   50997 instance.go:289] Using reconciler: lease
Feb 16 18:03:21 truenas.local k3s[50997]: I0216 18:03:21.471223   50997 rest.go:131] the default service ipfamily for this cluster is: IPv4
Feb 16 18:03:21 truenas.local k3s[50997]: W0216 18:03:21.854106   50997 genericapiserver.go:419] Skipping API batch/v2alpha1 because it has no resources.
Feb 16 18:03:21 truenas.local k3s[50997]: W0216 18:03:21.865364   50997 genericapiserver.go:419] Skipping API discovery.k8s.io/v1alpha1 because it has no resources.
Feb 16 18:03:21 truenas.local k3s[50997]: W0216 18:03:21.878537   50997 genericapiserver.go:419] Skipping API node.k8s.io/v1alpha1 because it has no resources.
Feb 16 18:03:21 truenas.local k3s[50997]: W0216 18:03:21.888277   50997 genericapiserver.go:419] Skipping API rbac.authorization.k8s.io/v1alpha1 because it has no resources.
Feb 16 18:03:21 truenas.local k3s[50997]: W0216 18:03:21.892312   50997 genericapiserver.go:419] Skipping API scheduling.k8s.io/v1alpha1 because it has no resources.
Feb 16 18:03:21 truenas.local k3s[50997]: W0216 18:03:21.898655   50997 genericapiserver.go:419] Skipping API storage.k8s.io/v1alpha1 because it has no resources.
Feb 16 18:03:21 truenas.local k3s[50997]: W0216 18:03:21.901712   50997 genericapiserver.go:419] Skipping API flowcontrol.apiserver.k8s.io/v1alpha1 because it has no resources.
Feb 16 18:03:21 truenas.local k3s[50997]: W0216 18:03:21.907281   50997 genericapiserver.go:419] Skipping API apps/v1beta2 because it has no resources.
Feb 16 18:03:21 truenas.local k3s[50997]: W0216 18:03:21.907297   50997 genericapiserver.go:419] Skipping API apps/v1beta1 because it has no resources.
Feb 16 18:03:21 truenas.local k3s[50997]: I0216 18:03:21.918228   50997 plugins.go:158] Loaded 12 mutating admission controller(s) successfully in the following order: NamespaceLifecycle,LimitRanger,ServiceAccount,NodeRestriction,TaintNodesByCondition,Priority,DefaultTolerationSeconds,DefaultStorageClass,StorageObjectInUseProtection,RuntimeClass,DefaultIngress>
Feb 16 18:03:21 truenas.local k3s[50997]: I0216 18:03:21.918250   50997 plugins.go:161] Loaded 10 validating admission controller(s) successfully in the following order: LimitRanger,ServiceAccount,Priority,PersistentVolumeClaimResize,RuntimeClass,CertificateApproval,CertificateSigning,CertificateSubjectRestriction,ValidatingAdmissionWebhook,ResourceQuota.
Feb 16 18:03:21 truenas.local k3s[50997]: time="2021-02-16T18:03:21.927801984-08:00" level=fatal msg="starting kubernetes: stat /mnt/pookie/ix-applications/k3s/server/cred/admin.kubeconfig: no such file or directory"
Feb 16 18:03:21 truenas.local systemd[1]: k3s.service: Main process exited, code=exited, status=1/FAILURE
░░ Subject: Unit process exited
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░ 
░░ An ExecStart= process belonging to unit k3s.service has exited.
░░ 
░░ The process' exit code is 'exited' and its exit status is 1.
Feb 16 18:03:21 truenas.local systemd[1]: k3s.service: Failed with result 'exit-code'.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░ 
░░ The unit k3s.service has entered the 'failed' state with result 'exit-code'.
Feb 16 18:03:21 truenas.local systemd[1]: Failed to start Lightweight Kubernetes.
░░ Subject: A start job for unit k3s.service has failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░ 
░░ A start job for unit k3s.service has finished with a failure.