[  917.957843][ T7972] Could not find device with ifindex 2000 in netnsfd 11
[  917.958542][ T7972] Could not find netns with fd: 2000
[  917.959066][ T7972] Cannot link a netdevsim to itself
[  917.959933][ T7972] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).