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Subject: Re: [PATCH bpf-next v3] selftests/bpf: fix task_local_storage/exit_creds
 rcu usage
From:   patchwork-bot+netdevbpf@kernel.org
Message-Id: <166638661643.2639.16814405561858562162.git-patchwork-notify@kernel.org>
Date:   Fri, 21 Oct 2022 21:10:16 +0000
References: <156d4ef82275a074e8da8f4cffbd01b0c1466493.camel@meta.com>
In-Reply-To: <156d4ef82275a074e8da8f4cffbd01b0c1466493.camel@meta.com>
To:     Delyan Kratunov <delyank@meta.com>
Cc:     daniel@iogearbox.net, songliubraving@meta.com, ast@kernel.org,
        andrii@kernel.org, bpf@vger.kernel.org
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List-ID: <bpf.vger.kernel.org>
X-Mailing-List: bpf@vger.kernel.org

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Fri, 21 Oct 2022 19:36:38 +0000 you wrote:
> BPF CI has revealed flakiness in the task_local_storage/exit_creds test.
> The failure point in CI [1] is that null_ptr_count is equal to 0,
> which indicates that the program hasn't run yet. This points to the
> kern_sync_rcu (sys_membarrier -> synchronize_rcu underneath) not
> waiting sufficiently.
> 
> Indeed, synchronize_rcu only waits for read-side sections that started
> before the call. If the program execution starts *during* the
> synchronize_rcu invocation (due to, say, preemption), the test won't
> wait long enough.
> 
> [...]

Here is the summary with links:
  - [bpf-next,v3] selftests/bpf: fix task_local_storage/exit_creds rcu usage
    https://git.kernel.org/bpf/bpf-next/c/eb814cf1adea

You are awesome, thank you!
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