netdev - Re: selftests: net: cmsg_so

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Date:   Thu, 8 Dec 2022 18:17:40 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Netdev <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: selftests: net: cmsg_so_mark.sh test hangs

On Mon, 5 Dec 2022 17:59:37 +0530 Naresh Kamboju wrote:
> The selftest net cmsg_so_mark.sh test hangs on all devices.
> Test case run with "set -x" to identify which steps are causing the hang.

Is it possible to get a stack trace of the script while it's blocked?
From /proc/$pid/stack ?

The test takes 30sec on a debug-heavy build for me so capturing a stack
a couple of minutes after starting should should us where it's stuck?

> Am I missing any pre-requirements / setup ?

And it works here..

The only thing I can see that may be blocking is getaddrinfo()... maybe?
Is there anything special going on with address resolution?