linux-kernel - Re: [PATCH v4] tracing: Fix race condition in kprobe initialization causing NULL pointer dereference

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Message-Id: <20251002230426.708abb71918760263d499ec8@kernel.org>
Date: Thu, 2 Oct 2025 23:04:26 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>, Peter Zijlstra
 <peterz@...radead.org>, chenyuan_fl@....com, bigeasy@...utronix.de,
 chenyuan@...inos.cn, john.ogness@...utronix.de,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 mathieu.desnoyers@...icios.com
Subject: Re: [PATCH v4] tracing: Fix race condition in kprobe initialization
 causing NULL pointer dereference

On Thu, 2 Oct 2025 07:59:24 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:

> On Wed, 1 Oct 2025 10:31:49 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > On Wed, 1 Oct 2025 14:32:00 +0200
> > Peter Zijlstra <peterz@...radead.org> wrote:
> > 
> > > Anyway, patch looks reasonable now. Rest is up to Steve, this is his
> > > code.
> > 
> > Actually, it's Masami's ;-)  And it's up to him.
> 
> Yeah, looks good to me. Let me pick it as a fix.

BTW, I will add below, the commit introduced the flags.

    Fixes: 50d780560785 ("tracing/kprobes: Add probe handler dispatcher to support perf and ftrace concurrent use")
    Cc: stable@...r.kernel.org

Thanks,

> 
> Thank you!
> 
> > 
> > -- Steve
> 
> 
> -- 
> Masami Hiramatsu (Google) <mhiramat@...nel.org>


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>