The help/man page of the "net" command suggests that "-n" option can accept two valid arguments: PID or task_struct pointer. However, the "net -n" command accepts invalid arguments and shows a bogus result. For example: crash> net -n 1000000000 NET_DEVICE NAME IP ADDRESS(ES) ffff949dc11d7000 lo 127.0.0.1 ffff949dcc01c000 eno49 192.168.122.17 In fact, when an invalid argument is entered, it always outputs the network namespace of a current contex. This is not expected. With the patch: crash> net -n 1000000000 net: invalid task or pid value: 1000000000 Reported-by: Buland Kumar Singh <bsingh(a)redhat.com&gt; Signed-off-by: Lianbo Jiang <lijiang(a)redhat.com&gt; --- net.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net.c b/net.c index 987dc8934942..18c238be346d 100644 --- a/net.c +++ b/net.c @@ -420,6 +420,9 @@ cmd_net(void) case STR_PID: case STR_TASK: task = tc->task; + break; + case STR_INVALID: + error(FATAL, "invalid task or pid value: %s\n", args[optind]); } } break; -- 2.37.1