linux-kernel - Re: [PATCH 3/3] utrace-based ftrace "process" engine, v2

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Message-ID: <20090323151400.GA3413@redhat.com>
Date:	Mon, 23 Mar 2009 16:14:00 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>, utrace-devel@...hat.com,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 3/3] utrace-based ftrace "process" engine, v2

On 03/23, Alexey Dobriyan wrote:
>
> Right now with ptrace(2) rewrite the following is easily triggerable:
>
> WARNING: at kernel/ptrace.c:515 ptrace_report_signal+0x2c1/0x2d0()

Yes, ptrace-over-utrace needs more work. But your message looks as if
utrace core is buggy, imho this is a bit unfair ;)

As Roland said, ptrace-over-utrace is not ready yet. If you mean that
utrace core should not be merged alone - this is another story.

But personally I understand why Roland sends utrace core before changing
ptrace.

Oleg.

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