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?
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https://bugs.launchpad.net/bugs/1011792
Title:
Kernel lockup running 3.0.0 and 3.2.0 on multiple EC2 instance types
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