Arch Linux

frank419

Member

Registered: 2012-01-12

Posts: 33

[SOLVED] stalls in CPUs/tasks

Could anyone help me make sense of these error messages?

an 23 12:20:19 myhost kernel: [ 2120.326509] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=612354 jiffies)
Jan 23 12:23:19 myhost kernel: [ 2300.433137] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=666386 jiffies)
Jan 23 12:26:19 myhost kernel: [ 2480.539805] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=720418 jiffies)
Jan 23 12:29:19 myhost kernel: [ 2660.646453] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=774450 jiffies)
Jan 23 12:32:19 myhost kernel: [ 2840.753082] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=828482 jiffies)
Jan 23 12:35:20 myhost kernel: [ 3020.859752] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=882514 jiffies)
Jan 23 12:38:20 myhost kernel: [ 3200.966400] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=936546 jiffies)
Jan 23 12:41:20 myhost kernel: [ 3381.073050] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=990578 jiffies)
Jan 23 12:44:20 myhost kernel: [ 3561.179699] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=1044610 jiffies)
Jan 23 12:47:20 myhost kernel: [ 3741.286326] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=1098642 jiffies)
Jan 23 12:50:20 myhost kernel: [ 3921.393000] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=1152674 jiffies)
Jan 23 12:53:20 myhost kernel: [ 4101.499645] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=1206706 jiffies)
Jan 23 12:56:20 myhost kernel: [ 4281.606322] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=1260738 jiffies)
Jan 23 12:59:20 myhost kernel: [ 4461.712919] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=1314770 jiffies)
Jan 23 13:02:21 myhost kernel: [ 4641.819590] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=1368802 jiffies)
Jan 23 13:05:21 myhost kernel: [ 4821.926237] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=1422834 jiffies)
Jan 23 13:08:21 myhost kernel: [ 5002.032893] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=1476866 jiffies)
Jan 23 13:11:21 myhost kernel: [ 5182.139535] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 2, t=1530898 jiffies)
Jan 23 13:14:55 myhost kernel: [  129.513369] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 3, t=18002 jiffies)
Jan 23 13:17:55 myhost kernel: [  309.620003] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 3, t=72034 jiffies)
Jan 23 13:20:55 myhost kernel: [  489.726704] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 3, t=126066 jiffies)
Jan 23 13:23:56 myhost kernel: [  669.833356] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 3, t=180098 jiffies)
Jan 23 13:26:56 myhost kernel: [  849.940002] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 3, t=234130 jiffies)
Jan 23 13:29:56 myhost kernel: [ 1030.046656] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 3, t=288162 jiffies)
Jan 23 13:32:56 myhost kernel: [ 1210.153287] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 3, t=342194 jiffies)
Jan 23 13:35:56 myhost kernel: [ 1390.259948] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 3, t=396226 jiffies)
Jan 23 13:38:56 myhost kernel: [ 1570.366543] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 3, t=450258 jiffies)
Jan 23 13:41:56 myhost kernel: [ 1750.473250] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 3, t=504290 jiffies)
Jan 23 13:44:56 myhost kernel: [ 1930.579880] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 3, t=558322 jiffies)
Jan 23 13:47:24 myhost kernel: [  103.766724] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 1, t=18002 jiffies)
Jan 23 13:50:25 myhost kernel: [  283.873340] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 1, t=72034 jiffies)
Jan 23 13:53:25 myhost kernel: [  463.980024] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 1, t=126066 jiffies)
Jan 23 13:56:25 myhost kernel: [  644.086667] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 1, t=180098 jiffies)
Jan 23 13:59:25 myhost kernel: [  824.193307] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 1, t=234130 jiffies)
Jan 23 14:02:25 myhost kernel: [ 1004.299977] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 1, t=288162 jiffies)
Jan 23 14:05:25 myhost kernel: [ 1184.406582] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 1, t=342194 jiffies)
Jan 23 14:08:25 myhost kernel: [ 1364.513274] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 1, t=396226 jiffies)
Jan 23 14:11:25 myhost kernel: [ 1544.619924] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 1, t=450258 jiffies)
Jan 23 14:16:22 myhost kernel: [  159.306732] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 2, t=18002 jiffies)
Jan 23 14:19:22 myhost kernel: [  339.413352] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 2, t=72034 jiffies)
Jan 23 14:22:22 myhost kernel: [  519.519968] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 2, t=126066 jiffies)
Jan 23 14:25:22 myhost kernel: [  699.626651] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 2, t=180098 jiffies)
Jan 23 14:28:22 myhost kernel: [  879.733301] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 2, t=234130 jiffies)
Jan 23 14:31:23 myhost kernel: [ 1059.839945] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 2, t=288162 jiffies)
Jan 23 14:34:23 myhost kernel: [ 1239.946626] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 2, t=342194 jiffies)
Jan 23 14:37:23 myhost kernel: [ 1420.053247] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 2, t=396226 jiffies)
Jan 23 14:42:50 myhost kernel: [  142.020042] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 2, t=18002 jiffies)
Jan 23 14:45:50 myhost kernel: [  322.126666] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 2, t=72034 jiffies)
Jan 23 14:48:50 myhost kernel: [  502.233315] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 2, t=126066 jiffies)
Jan 23 14:51:50 myhost kernel: [  682.339987] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 2, t=180098 jiffies)
Jan 23 16:09:23 myhost kernel: [  375.576663] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=18002 jiffies)
Jan 23 16:12:23 myhost kernel: [  555.683354] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=72034 jiffies)
Jan 23 16:15:23 myhost kernel: [  735.789997] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=126066 jiffies)
Jan 23 16:18:24 myhost kernel: [  915.896652] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=180098 jiffies)
Jan 23 16:21:24 myhost kernel: [ 1096.003256] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=234130 jiffies)
Jan 23 16:24:24 myhost kernel: [ 1276.109948] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=288162 jiffies)
Jan 23 16:27:24 myhost kernel: [ 1456.216556] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=342194 jiffies)
Jan 23 16:30:24 myhost kernel: [ 1636.323243] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=396226 jiffies)
Jan 23 16:33:24 myhost kernel: [ 1816.429891] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=450258 jiffies)
Jan 23 16:36:24 myhost kernel: [ 1996.536502] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=504290 jiffies)
Jan 23 16:39:24 myhost kernel: [ 2176.643193] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=558322 jiffies)
Jan 23 16:42:24 myhost kernel: [ 2356.749836] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=612354 jiffies)
Jan 23 16:45:25 myhost kernel: [ 2536.856484] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=666386 jiffi

Last edited by frank419 (2012-02-07 21:15:45)

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Datacenter Ninja

z0id

Member

From: Romania

Registered: 2010-02-02

Posts: 122

Re: [SOLVED] stalls in CPUs/tasks

See FS#26847  Are you using Networkmanager with IPv6?

Last edited by z0id (2012-02-07 21:01:43)

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/usr/bin/drinking

frank419

Member

Registered: 2012-01-12

Posts: 33

Re: [SOLVED] stalls in CPUs/tasks

Thanks for the reply z0id. I read the bug report, and also disabled ipv6 by editing /etc/modprobe.d/modprobe.conf with:

 # disable autoload of ipv6
 alias net-pf-10 off

This seems to have stopped the freezing I have been experiencing related network tasks as well. It seems the rcu_preempts have stopped, since I rebooted 10 minutes ago. Thanks for you help, marking as solved.

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Datacenter Ninja