linux-kernel - Re: s390 && user_enable_single_step() (Was: odd utrace testing results on s390x)

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Message-ID: <20100105170301.GA13641@redhat.com>
Date:	Tue, 5 Jan 2010 18:03:01 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	Roland McGrath <roland@...hat.com>, caiqian@...hat.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Jan Kratochvil <jkratoch@...hat.com>,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	utrace-devel@...hat.com
Subject: Re: s390 && user_enable_single_step() (Was: odd utrace testing
	results on s390x)

On 01/05, Oleg Nesterov wrote:
>
> I'll add clear_bit(TIF_SINGLE_STEP) into do_fork() path and re-test.

Hmm. This patch

	--- kernel/fork.c~	2009-12-22 10:41:53.188084961 -0500
	+++ kernel/fork.c	2010-01-05 11:42:58.370636323 -0500
	@@ -1206,6 +1206,8 @@ static struct task_struct *copy_process(
		 * of CLONE_PTRACE.
		 */
		clear_tsk_thread_flag(p, TIF_SYSCALL_TRACE);
	+	clear_tsk_thread_flag(p, TIF_SINGLE_STEP);
	+	user_disable_single_step(p);
	 #ifdef TIF_SYSCALL_EMU
		clear_tsk_thread_flag(p, TIF_SYSCALL_EMU);
	 #endif

doesn't help, I still see the same XXX's in dmesg...

Oleg.

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