From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [RFC 6/7] net/af_xdp: load BPF file
Date: Wed, 28 Feb 2018 13:12:37 -0800
Message-ID: <20180228131237.07479a16@xeon-e3>
References: <20180227093554.23951-1-qi.z.zhang@intel.com>
 <20180227093554.23951-7-qi.z.zhang@intel.com>
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To: Qi Zhang <qi.z.zhang@intel.com>
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On Tue, 27 Feb 2018 17:35:53 +0800
Qi Zhang <qi.z.zhang@intel.com> wrote:

> +		return 1;
> +
> +	/* clear all kprobes */
> +	i = system("echo \"\" > /sys/kernel/debug/tracing/kprobe_events");

Serious ick.
Assumes run as root.

And should be done directly not via system().