From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx186.postini.com [74.125.245.186]) by kanga.kvack.org (Postfix) with SMTP id B138E6B0044 for ; Sat, 24 Mar 2012 10:46:03 -0400 (EDT) Date: Sat, 24 Mar 2012 10:45:59 -0400 Message-Id: Subject: RCU stalls in merge-window (v3.3-6946-gf1d38e4) From: "Theodore Ts'o" Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: "Paul E. McKenney" I've been running xfstests of my ext4 dev branch merged in with v3.3-6946-gf1d38e3 --- the latest from Linus's tree as of this morning --- as a last minute check before sending a pull request to Linus, and I'm seeing that xfstests #76 is quite reliably causing an rcu_sched self-detecting stall warning, followed by a wedged kernel. A quick web search shows that Dan Carpenter noticed a similar problem about two weeks ago, but there was no follow-up as far as I could tell: https://lkml.org/lkml/2012/3/13/360 Since Dan reported that "light e-mail and the occasional git pull" on his netbook is sufficient to reproduce this problem, it seems rather serious... Any updates on this issue? - Ted 076 [ 216.353320] INFO: rcu_sched self-detected stall on CPU { 0} (t=18000 jiffies) [ 216.353321] Pid: 623, comm: kswapd0 Not tainted 3.3.0-07010-g1a897e3 #36 [ 216.353321] Call Trace: [ 216.353321] [] __rcu_pending+0x9e/0x34e [ 216.353321] [] rcu_pending+0x21/0x4d [ 216.353321] [] rcu_check_callbacks+0x79/0x97 [ 216.353321] [] update_process_times+0x32/0x5d [ 216.353321] [] tick_sched_timer+0x6d/0x9b [ 216.353321] [] __run_hrtimer+0xa7/0x11e [ 216.353321] [] ? tick_nohz_handler+0xd9/0xd9 [ 216.353321] [] hrtimer_interrupt+0xe6/0x1ec [ 216.353321] [] smp_apic_timer_interrupt+0x6c/0x7f [ 216.353321] [] apic_timer_interrupt+0x2f/0x34 [ 216.353321] [] ? zone_watermark_ok_safe+0x22/0x85 [ 216.353321] [] kswapd+0x3d8/0x7f9 [ 216.353321] [] ? wake_up_bit+0x60/0x60 [ 216.353321] [] ? shrink_all_memory+0xa8/0xa8 [ 216.353321] [] kthread+0x6c/0x71 [ 216.353321] [] ? __init_kthread_worker+0x47/0x47 [ 216.353321] [] kernel_thread_helper+0x6/0x10 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org