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] [<c01b91be>] __rcu_pending+0x9e/0x34e [ 216.353321] [<c01b948f>] rcu_pending+0x21/0x4d [ 216.353321] [<c01b9956>] rcu_check_callbacks+0x79/0x97 [ 216.353321] [<c0163869>] update_process_times+0x32/0x5d [ 216.353321] [<c019349b>] tick_sched_timer+0x6d/0x9b [ 216.353321] [<c01744f2>] __run_hrtimer+0xa7/0x11e [ 216.353321] [<c019342e>] ? tick_nohz_handler+0xd9/0xd9 [ 216.353321] [<c0174773>] hrtimer_interrupt+0xe6/0x1ec [ 216.353321] [<c0147f7a>] smp_apic_timer_interrupt+0x6c/0x7f [ 216.353321] [<c06db117>] apic_timer_interrupt+0x2f/0x34 [ 216.353321] [<c01dfa12>] ? zone_watermark_ok_safe+0x22/0x85 [ 216.353321] [<c01e9eb5>] kswapd+0x3d8/0x7f9 [ 216.353321] [<c0170d68>] ? wake_up_bit+0x60/0x60 [ 216.353321] [<c01e9add>] ? shrink_all_memory+0xa8/0xa8 [ 216.353321] [<c01709e6>] kthread+0x6c/0x71 [ 216.353321] [<c017097a>] ? __init_kthread_worker+0x47/0x47 [ 216.353321] [<c06e08ba>] kernel_thread_helper+0x6/0x10 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>