Public bug reported:
While trying to investigate increased load (4.0+) after upgrading to
Oneiric, I found in syslog that the 01cpu_online script was hanging and
backtracing. Apparently, disabling it brings load down to acceptable
levels again.
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730184] INFO: task
01cpu_online:3670 blocked for more than 120 seconds.
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730190] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730194] 01cpu_online D
ffffffff81605060 0 3670 3653 0x00000000
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730200] ffff88020e311bb8
0000000000000086 ffffffff81aab780 0000000000000001
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730205] ffff88020e311fd8
ffff88020e311fd8 ffff88020e311fd8 0000000000012a40
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730210] ffff88022fa78000
ffff880226bbc560 ffff88020e311bb8 7fffffffffffffff
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730215] Call Trace:
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730226] [<ffffffff815e8555>]
schedule_timeout+0x2a5/0x320
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730231] [<ffffffff815e7fbf>]
wait_for_common+0xdf/0x180
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730236] [<ffffffff810572d0>] ?
try_to_wake_up+0x200/0x200
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730240] [<ffffffff815e813d>]
wait_for_completion+0x1d/0x20
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730245] [<ffffffff81081226>]
kthread_stop+0x46/0x110
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730251] [<ffffffff815ce9d0>]
cpu_stop_cpu_callback+0x11b/0x18d
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730256] [<ffffffff815edcfd>]
notifier_call_chain+0x4d/0x70
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730261] [<ffffffff810872ae>]
__raw_notifier_call_chain+0xe/0x10
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730265] [<ffffffff810605c0>]
__cpu_notify+0x20/0x40
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730269] [<ffffffff81060715>]
cpu_notify_nofail+0x15/0x20
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730274] [<ffffffff815b8c08>]
_cpu_down+0x1d8/0x270
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730278] [<ffffffff815b8cd7>]
cpu_down+0x37/0x50
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730282] [<ffffffff815ba7af>]
store_online+0x5f/0xb8
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730287] [<ffffffff813cc3c8>]
sysdev_store+0x18/0x30
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730292] [<ffffffff811d6c1f>]
sysfs_write_file+0xef/0x170
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730298] [<ffffffff81167793>]
vfs_write+0xb3/0x180
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730302] [<ffffffff81167aba>]
sys_write+0x4a/0x90
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730307] [<ffffffff815f21c2>]
system_call_fastpath+0x16/0x1b
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730310] INFO: task
kworker/1:2:3672 blocked for more than 120 seconds.
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730313] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730316] kworker/1:2 D
ffffffff81605120 0 3672 2 0x00000000
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730321] ffff8801f4cbbee0
0000000000000046 0000000000000000 0000000300000000
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730326] ffff8801f4cbbfd8
ffff8801f4cbbfd8 ffff8801f4cbbfd8 0000000000012a40
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730330] ffffffff81a0b020
ffff8801fa032e40 ffff8801f4cbbee0 ffff88020e311c40
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730335] Call Trace:
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730339] [<ffffffff8107cbc0>] ?
manage_workers.isra.30+0x130/0x130
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730343] [<ffffffff810811b3>]
kthread+0x73/0xa0
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730347] [<ffffffff815f32e4>]
kernel_thread_helper+0x4/0x10
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730351] [<ffffffff81081140>] ?
flush_kthread_worker+0xa0/0xa0
Sep 5 13:35:20 sidnei-laptop kernel: [ 360.730355] [<ffffffff815f32e0>] ?
gs_change+0x13/0x13
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: powernap 2.14-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-10.16-generic 3.0.4
Uname: Linux 3.0.0-10-generic x86_64
NonfreeKernelModules: nvidia wl
Architecture: amd64
Date: Mon Sep 5 13:38:27 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110815)
PackageArchitecture: all
SourcePackage: powernap
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: powernap (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug oneiric
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https://bugs.launchpad.net/bugs/841967
Title:
01cpu_online script hangs, backtraces, bumps load
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