netdev - Re: [net-next] bpf: avoid hashtab deadlock with try

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Date:   Mon, 21 Nov 2022 12:19:55 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     xiangxia.m.yue@...il.com
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>
Subject: Re: [net-next] bpf: avoid hashtab deadlock with try_lock

On Mon, 21 Nov 2022 18:05:21 +0800 xiangxia.m.yue@...il.com wrote:
> From: Tonghao Zhang <xiangxia.m.yue@...il.com>
> 
> The commit 20b6cc34ea74 ("bpf: Avoid hashtab deadlock with map_locked"),
> try to fix deadlock, but in some case, the deadlock occurs:
> 
> * CPUn in task context with K1, and taking lock.
> * CPUn interrupted by NMI context, with K2.
> * They are using the same bucket, but different map_locked.

You should really put bpf@ in the CC line for bpf patches.