Message-ID: <555A1A54.2080801@plumgrid.com>
Date: Mon, 18 May 2015 09:59:00 -0700
From: Alexei Starovoitov <ast@plumgrid.com>
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To: Wang Nan <wangnan0@huawei.com>, paulus@samba.org, a.p.zijlstra@chello.nl,
        mingo@redhat.com, acme@kernel.org, namhyung@kernel.org,
        jolsa@kernel.org, dsahern@gmail.com, daniel@iogearbox.net,
        brendan.d.gregg@gmail.com, masami.hiramatsu.pt@hitachi.com
CC: lizefan@huawei.com, linux-kernel@vger.kernel.org, pi3orama@163.com
Subject: Re: [RFC PATCH v3 01/37] perf/events/core: fix race in bpf program
 unregister
References: <1431860222-61636-1-git-send-email-wangnan0@huawei.com> <1431860222-61636-2-git-send-email-wangnan0@huawei.com>
In-Reply-To: <1431860222-61636-2-git-send-email-wangnan0@huawei.com>
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On 5/17/15 3:56 AM, Wang Nan wrote:
> there is a race between perf_event_free_bpf_prog() and free_trace_kprobe():
...
> Fixes: 2541517c32be ("tracing, perf: Implement BPF programs attached to kprobes")
> Reported-by: Wang Nan <wangnan0@huawei.com>
> Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>

there is no need to repost it.
Rather ack and/or add your tested-by to original thread:
https://lkml.org/lkml/2015/5/15/586

My fix is also not related to this series. Your work exposed
the bug, but the fix is needed in 4.1 whereas this stuff is
targeting 4.2 the earliest.

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