linux-kernel - Re: [RFC PATCH v3 01/37] perf/events/core: fix race in bpf program unregister

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Message-ID: <555A1A54.2080801@plumgrid.com>
Date:	Mon, 18 May 2015 09:59:00 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Wang Nan <wangnan0@...wei.com>, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, mingo@...hat.com, acme@...nel.org,
	namhyung@...nel.org, jolsa@...nel.org, dsahern@...il.com,
	daniel@...earbox.net, brendan.d.gregg@...il.com,
	masami.hiramatsu.pt@...achi.com
CC:	lizefan@...wei.com, linux-kernel@...r.kernel.org, pi3orama@....com
Subject: Re: [RFC PATCH v3 01/37] perf/events/core: fix race in bpf program
 unregister

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@...wei.com>
> Signed-off-by: Alexei Starovoitov <ast@...mgrid.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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