[kata-dev] Rust agent debug
Qian Cai
qcai at redhat.com
Tue Mar 2 21:02:23 UTC 2021
I am chasing a bug that "crictl rm" returns ESRCH which ends up tracking down in
the rust agent code:
https://github.com/kata-containers/kata-containers/blob/a12772c6010f6886be7af86cd8c1a03008c4bb6c/src/agent/src/rpc.rs#L313
I don't yet understand how to get some debugging messages outside of the agent,
so I can see why it return ESRCH. I tried added things like,
info!(sl!(), "KKK in do_signal_process()");
but I can't see that message anywhere. I even setup a debug console which allows
me to connect to a shell, but that is. The only way I can get some message out
(showed up in the CRI daemon logs) so far is,
return Err(anyhow!("KKK in do_signal_process()"));
which has to terminate the function. Do I have to use things like agent-ctl to
capture those "info!" output?
Anyway, it is even better if anyone has some ideas on the bug itself which is
that if we do a "crictl rm" without "crictl start" first, it will error out.
# crictl runp --runtime=kata pod-config.json
# crictl create <sid> container-pod.json pod-config.json
# crictl rm <cid>
ERRO[0010] removing container
"144cf0b64d154983da7419a5e8ae5bcb796cc7b054aa7fdcfbb6c44ad8f33621" failed: rpc
error: code = Unknown desc = unable to stop container
144cf0b64d154983da7419a5e8ae5bcb796cc7b054aa7fdcfbb6c44ad8f33621: failed to stop
container 144cf0b64d154983da7419a5e8ae5bcb796cc7b054aa7fdcfbb6c44ad8f33621:
ESRCH: No such process: unknown
FATA[0010] unable to remove container(s)
# cat pod-config.json
{
"metadata": {
"name": "alpine-sandbox",
"namespace": "default",
"attempt": 1,
"uid": "hdishd83djaidwnduwk28bcsb"
},
"log_directory": "/tmp",
"linux": {
}
}
# cat container-pod.json
{
"metadata": {
"name": "alpine"
},
"image":{
"image": "alpine"
},
"command": [
"sleep", "3600"
],
"log_path":"alpine.0.log",
"linux": {
}
}
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