From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161318Ab2COTrr (ORCPT ); Thu, 15 Mar 2012 15:47:47 -0400 Received: from mail-bk0-f46.google.com ([209.85.214.46]:58528 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965418Ab2COTrn (ORCPT ); Thu, 15 Mar 2012 15:47:43 -0400 From: Sasha Levin To: linux-kernel@vger.kernel.org Cc: mingo@elte.hu, akpm@linux-foundation.org, tglx@linutronix.de, hpa@zytor.com, Sasha Levin Subject: [PATCH] hung task: NMI when hung and going to panic Date: Thu, 15 Mar 2012 17:47:20 -0400 Message-Id: <1331848040-1676-1-git-send-email-levinsasha928@gmail.com> X-Mailer: git-send-email 1.7.8.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org NMI all CPUs when detected a hung task and the hung task code is configured to panic. This lets us get stack trace of all CPUs which makes life easier trying to debug a deadlock, and the NMI doesn't change anything since the next step is a kernel panic. Signed-off-by: Sasha Levin --- kernel/hung_task.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) diff --git a/kernel/hung_task.c b/kernel/hung_task.c index c21449f..6df6149 100644 --- a/kernel/hung_task.c +++ b/kernel/hung_task.c @@ -108,8 +108,10 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout) touch_nmi_watchdog(); - if (sysctl_hung_task_panic) + if (sysctl_hung_task_panic) { + trigger_all_cpu_backtrace(); panic("hung_task: blocked tasks"); + } } /* -- 1.7.8.4