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Date: Mon, 31 Mar 2014 16:22:21 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Dave Jones <davej@...hat.com>, Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: rcu_prempt stalls / lockup On Mon, Mar 31, 2014 at 07:02:41PM -0400, Dave Jones wrote: > You can tell the merge window is open, because I'm back to breaking RCU. > > [ 1023.934532] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 1023.935501] (detected by 0, t=6502 jiffies, g=28666, c=28665, q=0) > [ 1023.936299] INFO: Stall ended before state dump start > [ 1218.871404] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 1218.872399] (detected by 0, t=26007 jiffies, g=28666, c=28665, q=0) > [ 1218.873256] INFO: Stall ended before state dump start > [ 1413.808406] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 1413.809387] (detected by 0, t=45512 jiffies, g=28666, c=28665, q=0) > [ 1413.810113] INFO: Stall ended before state dump start > [ 1608.745637] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 1608.746614] (detected by 0, t=65017 jiffies, g=28666, c=28665, q=0) > [ 1608.747327] INFO: Stall ended before state dump start > [ 1803.682892] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 1803.683876] (detected by 1, t=84522 jiffies, g=28666, c=28665, q=0) > [ 1803.684741] INFO: Stall ended before state dump start > [ 1998.620169] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 1998.621123] (detected by 0, t=104027 jiffies, g=28666, c=28665, q=0) > [ 1998.621916] INFO: Stall ended before state dump start > [ 2193.557459] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 2193.558425] (detected by 0, t=123532 jiffies, g=28666, c=28665, q=0) > [ 2193.559248] INFO: Stall ended before state dump start > [ 2388.494719] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 2388.495688] (detected by 0, t=143037 jiffies, g=28666, c=28665, q=0) > [ 2388.496417] INFO: Stall ended before state dump start > [ 2583.431983] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 2583.432967] (detected by 0, t=162542 jiffies, g=28666, c=28665, q=0) > [ 2583.433852] INFO: Stall ended before state dump start > [ 2778.369242] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 2778.370235] (detected by 0, t=182047 jiffies, g=28666, c=28665, q=0) > [ 2778.371037] INFO: Stall ended before state dump start > [ 2973.306537] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 2973.307540] (detected by 0, t=201552 jiffies, g=28666, c=28665, q=0) > [ 2973.308347] INFO: Stall ended before state dump start > [ 3168.244036] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 3168.245056] (detected by 0, t=221057 jiffies, g=28666, c=28665, q=0) > [ 3168.245805] INFO: Stall ended before state dump start > [ 3363.181458] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 3363.182496] (detected by 0, t=240562 jiffies, g=28666, c=28665, q=0) > [ 3363.183289] INFO: Stall ended before state dump start > [ 3558.118835] INFO: rcu_preempt detected stalls on CPUs/tasks: > [ 3558.119879] (detected by 0, t=260067 jiffies, g=28666, c=28665, q=0) > [ 3558.120739] INFO: Stall ended before state dump start > > at that point, userspace stopped responding. cursor on console was blinking, > but I couldn't even switch tty's, or sysrq dump. > > rc8 was fine, so this is todays rcu changes. New one on me! Any chance of a .config file? Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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