netdev - Re: [PATCH bpf v2] selftests/bpf: test_progs: fix client/server race in tcp

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Date:   Wed, 25 Sep 2019 22:19:13 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, davem@...emloft.net,
        ast@...nel.org
Subject: Re: [PATCH bpf v2] selftests/bpf: test_progs: fix client/server race
 in tcp_rtt

On Mon, Sep 23, 2019 at 11:41:12AM -0700, Stanislav Fomichev wrote:
> This is the same problem I found earlier in test_sockopt_inherit:
> there is a race between server thread doing accept() and client
> thread doing connect(). Let's explicitly synchronize them via
> pthread conditional variable.
> 
> v2:
> * don't exit from server_thread without signaling condvar,
>   fixes possible issue where main() would wait forever (Andrii Nakryiko)
> 
> Fixes: b55873984dab ("selftests/bpf: test BPF_SOCK_OPS_RTT_CB")
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>

Applied, thanks!