linux-kernel - Re: [PATCH v5 00/21] kprobes: Unify kretprobe trampoline handlers and make kretprobe lockless

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Date:   Tue, 8 Sep 2020 13:33:39 +0200
From:   peterz@...radead.org
To:     "Eddy_Wu@...ndmicro.com" <Eddy_Wu@...ndmicro.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "naveen.n.rao@...ux.ibm.com" <naveen.n.rao@...ux.ibm.com>,
        "anil.s.keshavamurthy@...el.com" <anil.s.keshavamurthy@...el.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "cameron@...dycamel.com" <cameron@...dycamel.com>,
        "oleg@...hat.com" <oleg@...hat.com>,
        "will@...nel.org" <will@...nel.org>,
        "paulmck@...nel.org" <paulmck@...nel.org>,
        "systemtap@...rceware.org" <systemtap@...rceware.org>
Subject: Re: [PATCH v5 00/21] kprobes: Unify kretprobe trampoline handlers
 and make kretprobe lockless

On Tue, Sep 08, 2020 at 11:15:14AM +0000, Eddy_Wu@...ndmicro.com wrote:
> > From: peterz@...radead.org <peterz@...radead.org>
> >
> > I'm now trying and failing to reproduce.... I can't seem to make it use
> > int3 today. It seems to want to use ftrace or refuses everything. I'm
> > probably doing it wrong.
> >
> 
> You can turn off CONFIG_KPROBES_ON_FTRACE (and also sysctl
> debug.kprobes-optimization) to make it use int3 handler

I'm fairly sure I used the sysctl like in your original reproducer.

I'll try again later.