Unfortunately, it looks like we're still freezing up with noautogroup enabled (set at boot using Grub).
Booted with:
Oct 17 00:07:45 localhost kernel: [ 0.000000] Command line: root=UUID=3ad27d04-4ecf-493d-bb19-4710c3caf924 ro console=hvc0 noautogroup
> uname -a Linux moonshine21-readslave-ssd-pv 3.2.0-31-virtual #50-Ubuntu SMP Fri Sep 7 16:36:36 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
> cat /proc/sys/kernel/sched_autogroup_enabled 0
But within a few hours (which, granted, is longer than Precise lasted without the autogrouping disabled):
Oct 17 02:38:00 localhost kernel: [1653329.620312] INFO: rcu_sched detected stalls on CPUs/tasks: { 1 4 6 8} (detected by 0, t=15002 jiffies) Oct 17 02:38:00 localhost kernel: [1653329.620330] sending NMI to all CPUs: Oct 17 02:41:00 localhost kernel: [1653509.748321] INFO: rcu_sched detected stalls on CPUs/tasks: { 1 4 6 8} (detected by 0, t=60034 jiffies) Oct 17 02:41:00 localhost kernel: [1653509.748340] sending NMI to all CPUs: Oct 17 02:42:24 localhost kernel: [1653594.056348] INFO: rcu_bh detected stalls on CPUs/tasks: { 1 3 4 6 8} (detected by 0, t=15002 jiffies) Oct 17 02:42:24 localhost kernel: [1653594.056362] sending NMI to all CPUs: Oct 17 02:44:00 localhost kernel: [1653689.876311] INFO: rcu_sched detected stalls on CPUs/tasks: { 1 4 6 8} (detected by 0, t=105066 jiffies) Oct 17 02:44:00 localhost kernel: [1653689.876326] sending NMI to all CPUs: Oct 17 02:45:24 localhost kernel: [1653774.184313] INFO: rcu_bh detected stalls on CPUs/tasks: { 1 3 4 6 8} (detected by 0, t=60034 jiffies) Oct 17 02:45:24 localhost kernel: [1653774.184331] sending NMI to all CPUs: Oct 17 02:47:00 localhost kernel: [1653870.004311] INFO: rcu_sched detected stalls on CPUs/tasks: { 1 4 6 8} (detected by 0, t=150098 jiffies) Oct 17 02:47:00 localhost kernel: [1653870.004326] sending NMI to all CPUs: Oct 17 02:48:24 localhost kernel: [1653954.312311] INFO: rcu_bh detected stalls on CPUs/tasks: { 1 3 4 6 8} (detected by 0, t=105066 jiffies)
Any other variations worth trying, or other data that would be interesting to produce?
Unfortunately, it looks like we're still freezing up with noautogroup enabled (set at boot using Grub).
Booted with:
Oct 17 00:07:45 localhost kernel: [ 0.000000] Command line: root=UUID= 3ad27d04- 4ecf-493d- bb19-4710c3caf9 24 ro console=hvc0 noautogroup
> uname -a readslave- ssd-pv 3.2.0-31-virtual #50-Ubuntu SMP Fri Sep 7 16:36:36 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
Linux moonshine21-
> cat /proc/sys/ kernel/ sched_autogroup _enabled
0
But within a few hours (which, granted, is longer than Precise lasted without the autogrouping disabled):
Oct 17 02:38:00 localhost kernel: [1653329.620312] INFO: rcu_sched detected stalls on CPUs/tasks: { 1 4 6 8} (detected by 0, t=15002 jiffies)
Oct 17 02:38:00 localhost kernel: [1653329.620330] sending NMI to all CPUs:
Oct 17 02:41:00 localhost kernel: [1653509.748321] INFO: rcu_sched detected stalls on CPUs/tasks: { 1 4 6 8} (detected by 0, t=60034 jiffies)
Oct 17 02:41:00 localhost kernel: [1653509.748340] sending NMI to all CPUs:
Oct 17 02:42:24 localhost kernel: [1653594.056348] INFO: rcu_bh detected stalls on CPUs/tasks: { 1 3 4 6 8} (detected by 0, t=15002 jiffies)
Oct 17 02:42:24 localhost kernel: [1653594.056362] sending NMI to all CPUs:
Oct 17 02:44:00 localhost kernel: [1653689.876311] INFO: rcu_sched detected stalls on CPUs/tasks: { 1 4 6 8} (detected by 0, t=105066 jiffies)
Oct 17 02:44:00 localhost kernel: [1653689.876326] sending NMI to all CPUs:
Oct 17 02:45:24 localhost kernel: [1653774.184313] INFO: rcu_bh detected stalls on CPUs/tasks: { 1 3 4 6 8} (detected by 0, t=60034 jiffies)
Oct 17 02:45:24 localhost kernel: [1653774.184331] sending NMI to all CPUs:
Oct 17 02:47:00 localhost kernel: [1653870.004311] INFO: rcu_sched detected stalls on CPUs/tasks: { 1 4 6 8} (detected by 0, t=150098 jiffies)
Oct 17 02:47:00 localhost kernel: [1653870.004326] sending NMI to all CPUs:
Oct 17 02:48:24 localhost kernel: [1653954.312311] INFO: rcu_bh detected stalls on CPUs/tasks: { 1 3 4 6 8} (detected by 0, t=105066 jiffies)
Any other variations worth trying, or other data that would be interesting to produce?