Re: [Bugme-new] [Bug 14150] New: BUG: soft lockup - CPU#3 stuck for 61s!, while running cpu controller latency testcase on two containers parallaly

[Rishikesh <risrajak@linux.vnet.ibm.com>]

Hi Dhaval,

Today i tried 2 more scenario requested by you on -tip kernel:

1> mount cpu on cgroup & other susbsystems ( ns, cpuset,freezer... 
except cpu) on cgroup1 e.g:.
/root/lxc on /cgroup type cgroup 
(rw,ns,cpuset,freezer,devices,memory,cpuacct,net_cls)
none on /cgroup1 type cgroup (rw,cpu)

    Result: I am able to create container ( no crash after "lxc-execute 
..." command execution).
2> mount cpu,ns on cgroup
[root@x335a ~]# mount
none on /cgroup type cgroup (rw,ns,cpu)
[root@x335a ~]# lxc-execute -n foo2 -f /etc/lxc/lxc-macvlan.conf /bin/bash

    Result : The system crash with following trace once i execute 
lxc-execute command:

x335a.in.ibm.com login: BUG: NMI Watchdog detected LOCKUP on CPU1, ip 
c0425854, registers:
Modules linked in: nfs lockd nfs_acl auth_rpcgss bridge stp llc bnep sco 
l2cap bluetooth autofs4 sunrpc ipv6 p4_clockmod dm_multipath uinput 
ata_generic pata_acpi floppy i2c_piix4 i2c_core pata_serverworks tg3 
pcspkr serio_raw mptspi mptscsih mptbase scsi_transport_spi [last 
unloaded: scsi_wait_scan]

Pid: 0, comm: swapper Not tainted (2.6.31-tip #2) eserver xSeries 335 
-[867641X]-
EIP: 0060:[<c0425854>] EFLAGS: 00000246 CPU: 1
EIP is at native_safe_halt+0xa/0xc
EAX: f70a8000 EBX: c096f0d4 ECX: b9d8d702 EDX: 00000001
ESI: 00000001 EDI: 00000000 EBP: f70a9f74 ESP: f70a9f74
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
Process swapper (pid: 0, ti=f70a8000 task=f7086780 task.ti=f70a8000)
Stack:
 f70a9f94 c040e63b f70a9f94 c0460b8d 00000001 c096f0d4 00000001 00000000
<0> f70a9fa4 c0407637 00000001 00000000 f70a9fb0 c075a578 0602080b 00000000
<0> 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
Call Trace:
 [<c040e63b>] ? default_idle+0x4a/0x7c
 [<c0460b8d>] ? tick_nohz_restart_sched_tick+0x115/0x123
 [<c0407637>] ? cpu_idle+0x58/0x79
 [<c075a578>] ? start_secondary+0x19c/0x1a1
Code: 89 e5 0f 1f 44 00 00 50 9d 5d c3 55 89 e5 0f 1f 44 00 00 fa 5d c3 
55 89 e5 0f 1f 44 00 00 fb 5d c3 55 89 e5 0f 1f 44 00 00 fb f4 <5d> c3 
55 89 e5 0f 1f 44 00 00 f4 5d c3 55 89 e5 0f 1f 44 00 00


Evening i am going to try 3rd scenario:
    - Enable CONFIG_PROVE_LOCKING and then execute above scenario once 
again.

Hope above result will help you to debug further.

-Rishi

Rishikesh wrote:
> I am able to reproduce this bug on F12-Alpha on 64 bit machine also. So 
> looks like it is a sever bug which need early fix.
> For all at same page, i am rewriting the steps once again.
>
> - Create two container using lxc tool. ( used lxc-0.6.3).
>     lxc-execute -n foo1 -f /usr/etc/lxc/lxc-macvlan.conf /bin/bash
>     lxc-execute -n foo2 -f /usr/etc/lxc/lxc-complex-config /bin/bash
>
> - Compile and run ltp controller testcase inside both container.
> - once it runs cpu latency testcase you can observe the trace.
>
> -Rishi
>
> BUG: soft lockup - CPU#1 stuck for 61s! [cpuctl_latency_:27296]
> Modules linked in: veth fuse tun ipt_MASQUERADE iptable_nat nf_nat 
> bridge stp llc nfsd lockd nfs_acl auth_rpcgss exportfs sunrpc ipv6 
> p4_clockmod freq_table speedstep_lib dm_multipath kvm_intel kvm uinput 
> ibmpex ibmaem ipmi_msghandler ics932s401 iTCO_wdt iTCO_vendor_support 
> joydev serio_raw i2c_i801 bnx2 ses enclosure i5k_amb hwmon igb shpchp 
> i5000_edac edac_core dca aacraid radeon ttm drm_kms_helper drm 
> i2c_algo_bit i2c_core [last unloaded: freq_table]
> irq event stamp: 0
> hardirqs last  enabled at (0): [<(null)>] (null)
> hardirqs last disabled at (0): [<ffffffff81062500>] 
> copy_process+0x5b9/0x1478
> softirqs last  enabled at (0): [<ffffffff81062500>] 
> copy_process+0x5b9/0x1478
> softirqs last disabled at (0): [<(null)>] (null)
> CPU 1:
> Modules linked in: veth fuse tun ipt_MASQUERADE iptable_nat nf_nat 
> bridge stp llc nfsd lockd nfs_acl auth_rpcgss exportfs sunrpc ipv6 
> p4_clockmod freq_table speedstep_lib dm_multipath kvm_intel kvm uinput 
> ibmpex ibmaem ipmi_msghandler ics932s401 iTCO_wdt iTCO_vendor_support 
> joydev serio_raw i2c_i801 bnx2 ses enclosure i5k_amb hwmon igb shpchp 
> i5000_edac edac_core dca aacraid radeon ttm drm_kms_helper drm 
> i2c_algo_bit i2c_core [last unloaded: freq_table]
> Pid: 27296, comm: cpuctl_latency_ Tainted: G        W  
> 2.6.31-14.fc12.x86_64 #1 IBM System x3550 -[7978C5Z]-
> RIP: 0010:[<ffffffff81276dff>]  [<ffffffff81276dff>] find_next_bit+0x5b/0xc3
> RSP: 0000:ffff8800047e1c50  EFLAGS: 00000286
> RAX: 0000000000000000 RBX: ffff8800047e1c60 RCX: 0000000000000004
> RDX: 0000000000000004 RSI: 0000000000000200 RDI: 0000000000000200
> RBP: ffffffff81012bf3 R08: 0000000000000000 R09: ffff8800047ede88
> R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800047e1bd0
> R13: 0000000000000400 R14: ffff8800392bb6c0 R15: 00000000096981ea
> FS:  00007f395ff0e700(0000) GS:ffff8800047de000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fbfb98f0db0 CR3: 000000000d394000 CR4: 00000000000026f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Call Trace:
>  <IRQ>  [<ffffffff8104eb31>] ? cpumask_next+0x30/0x46
>  [<ffffffff81054442>] ? tg_shares_up+0x17b/0x1af
>  [<ffffffff810542c7>] ? tg_shares_up+0x0/0x1af
>  [<ffffffff81049447>] ? tg_nop+0x0/0x32
>  [<ffffffff8104f708>] ? walk_tg_tree+0x8e/0xca
>  [<ffffffff8104f682>] ? walk_tg_tree+0x8/0xca
>  [<ffffffff810579fc>] ? update_shares+0x59/0x74
>  [<ffffffff8105c8e7>] ? rebalance_domains+0x178/0x599
>  [<ffffffff81085a1b>] ? hrtimer_interrupt+0x158/0x183
>  [<ffffffff8109602f>] ? trace_hardirqs_on_caller+0x32/0x175
>  [<ffffffff8105cd60>] ? run_rebalance_domains+0x58/0xf6
>  [<ffffffff815063eb>] ? _spin_unlock_irq+0x3f/0x61
>  [<ffffffff8106bf96>] ? __do_softirq+0xf6/0x1f0
>  [<ffffffff81095123>] ? trace_hardirqs_off_caller+0x32/0xd0
>  [<ffffffff8101322c>] ? call_softirq+0x1c/0x30
>  [<ffffffff81014d77>] ? do_softirq+0x5f/0xd7
>  [<ffffffff8106b8ad>] ? irq_exit+0x66/0xbc
>  [<ffffffff8102b724>] ? smp_apic_timer_interrupt+0x99/0xbf
>  [<ffffffff81012bf3>] ? apic_timer_interrupt+0x13/0x20
>  <EOI>
>
>
> Rishikesh wrote:
>   
>> Rishikesh wrote:
>>   
>>     
>>> Dhaval Giani wrote:
>>>     
>>>       
>>>> On Fri, Sep 11, 2009 at 02:28:13PM -0700, Andrew Morton wrote:
>>>>  
>>>>       
>>>>         
>>>>> (switched to email.  Please respond via emailed reply-to-all, not 
>>>>> via the
>>>>> bugzilla web interface).
>>>>>
>>>>> On Thu, 10 Sep 2009 09:32:30 GMT
>>>>> bugzilla-daemon@bugzilla.kernel.org wrote:
>>>>>
>>>>>    
>>>>>         
>>>>>           
>>>>>> http://bugzilla.kernel.org/show_bug.cgi?id=14150
>>>>>>
>>>>>>            Summary: BUG: soft lockup - CPU#3 stuck for 61s!, while 
>>>>>> running
>>>>>>                     cpu controller latency testcase on two containers
>>>>>>                     parallaly
>>>>>>            Product: Process Management
>>>>>>            Version: 2.5
>>>>>>     Kernel Version: 2.6.31-rc7
>>>>>>           Platform: All
>>>>>>         OS/Version: Linux
>>>>>>               Tree: Mainline
>>>>>>             Status: NEW
>>>>>>           Severity: high
>>>>>>           Priority: P1
>>>>>>          Component: Scheduler
>>>>>>         AssignedTo: mingo@elte.hu
>>>>>>         ReportedBy: risrajak@linux.vnet.ibm.com
>>>>>>                 CC: serue@us.ibm.com, iranna.ankad@in.ibm.com,
>>>>>>                     risrajak@in.ibm.com
>>>>>>         Regression: No
>>>>>>
>>>>>>
>>>>>> Created an attachment (id=23055)
>>>>>>  --> (http://bugzilla.kernel.org/attachment.cgi?id=23055)
>>>>>> Config-file-used
>>>>>>
>>>>>> Hitting this soft lock issue while running this scenario on 
>>>>>> 2.6.31-rc7 kernel
>>>>>> on SystemX 32 bit on multiple machines.
>>>>>>
>>>>>> Scenario:
>>>>>>     - While running cpu controller latency testcase from LTP same 
>>>>>> time on two
>>>>>> containers.
>>>>>>
>>>>>> Steps:
>>>>>> 1. Compile ltp-full-20090731.tgz on host.
>>>>>> 2. Create two container (Used lxc tool
>>>>>> (http://sourceforge.net/projects/lxc/lxc-0.6.3.tar.gz) for creating 
>>>>>> container )
>>>>>> e.g:
>>>>>>     lxc-create -n foo1
>>>>>>     lxc-create -n foo2
>>>>>> On first shell:
>>>>>>     lxc-execute -n foo1 -f /usr/etc/lxc/lxc-macvlan.conf /bin/bash
>>>>>> on Second shell:
>>>>>>     lxc-execute -n foo2 -f /usr/etc/lxc/lxc-macvlan.conf /bin/bash
>>>>>>
>>>>>> 3. Either you run cpu_latency testcase alone or run "./runltp -f 
>>>>>> controllers"
>>>>>> at same time on both the containers.
>>>>>> 4. After testcase execution completes, you can see this message in 
>>>>>> dmesg.
>>>>>>
>>>>>> Expected Result:
>>>>>>     - Should not reproduce soft lock up issue.
>>>>>> - This reproduces 3 times out of 5 tries.
>>>>>>
>>>>>> hrtimer: interrupt too slow, forcing clock min delta to 5843235 ns
>>>>>> hrtimer: interrupt too slow, forcing clock min delta to 5842476 ns
>>>>>> Clocksource tsc unstable (delta = 18749057581 ns)
>>>>>> BUG: soft lockup - CPU#3 stuck for 61s! [cpuctl_latency_:17174]
>>>>>> Modules linked in: bridge stp llc bnep sco l2cap bluetooth sunrpc ipv6
>>>>>> p4_clockmod dm_multipath uinput qla2xxx ata_generic pata_acpi 
>>>>>> usb_storage e1000
>>>>>> scsi_transport_fc joydev scsi_tgt i2c_piix4 pata_serverworks pcspkr 
>>>>>> serio_raw
>>>>>> mptspi mptscsih mptbase scsi_transport_spi radeon ttm drm 
>>>>>> i2c_algo_bit i2c_core
>>>>>> [last unloaded: scsi_wait_scan]
>>>>>>
>>>>>> Pid: 17174, comm: cpuctl_latency_ Tainted: G        W  (2.6.31-rc7 
>>>>>> #1) IBM
>>>>>> eServer BladeCenter HS40 -[883961X]-                    EIP: 
>>>>>> 0060:[<c058aded>] EFLAGS: 00000283 CPU: 3
>>>>>> EIP is at find_next_bit+0x9/0x79
>>>>>> EAX: c2c437a0 EBX: f3d433c0 ECX: 00000000 EDX: 00000020
>>>>>> ESI: c2c436bc EDI: 00000000 EBP: f063be6c ESP: f063be64
>>>>>>  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
>>>>>> CR0: 80050033 CR2: 008765a4 CR3: 314d7000 CR4: 000006d0
>>>>>> DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
>>>>>> DR6: ffff0ff0 DR7: 00000400
>>>>>> Call Trace:
>>>>>>  [<c0427b6e>] cpumask_next+0x17/0x19
>>>>>>  [<c042c28d>] tg_shares_up+0x53/0x149
>>>>>>  [<c0424082>] ? tg_nop+0x0/0xc
>>>>>>  [<c0424082>] ? tg_nop+0x0/0xc
>>>>>>  [<c042406e>] walk_tg_tree+0x63/0x77
>>>>>>  [<c042c23a>] ? tg_shares_up+0x0/0x149
>>>>>>  [<c042e836>] update_shares+0x5d/0x65
>>>>>>  [<c0432af3>] rebalance_domains+0x114/0x460
>>>>>>  [<c0403393>] ? restore_all_notrace+0x0/0x18
>>>>>>  [<c0432e75>] run_rebalance_domains+0x36/0xa3
>>>>>>  [<c043c324>] __do_softirq+0xbc/0x173
>>>>>>  [<c043c416>] do_softirq+0x3b/0x5f
>>>>>>  [<c043c52d>] irq_exit+0x3a/0x68
>>>>>>  [<c0417846>] smp_apic_timer_interrupt+0x6d/0x7b
>>>>>>  [<c0403c9b>] apic_timer_interrupt+0x2f/0x34
>>>>>> BUG: soft lockup - CPU#2 stuck for 61s! [watchdog/2:11]
>>>>>> Modules linked in: bridge stp llc bnep sco l2cap bluetooth sunrpc ipv6
>>>>>> p4_clockmod dm_multipath uinput qla2xxx ata_generic pata_acpi 
>>>>>> usb_storage e1000
>>>>>> scsi_transport_fc joydev scsi_tgt i2c_piix4 pata_serverworks pcspkr 
>>>>>> serio_raw
>>>>>> mptspi mptscsih mptbase scsi_transport_spi radeon ttm drm 
>>>>>> i2c_algo_bit i2c_core
>>>>>> [last unloaded: scsi_wait_scan]
>>>>>>
>>>>>> Pid: 11, comm: watchdog/2 Tainted: G        W  (2.6.31-rc7 #1) IBM 
>>>>>> eServer
>>>>>> BladeCenter HS40 -[883961X]-                    EIP: 
>>>>>> 0060:[<c042c313>] EFLAGS: 00000246 CPU: 2
>>>>>> EIP is at tg_shares_up+0xd9/0x149
>>>>>> EAX: 00000000 EBX: f09b3c00 ECX: f0baac00 EDX: 00000100
>>>>>> ESI: 00000002 EDI: 00000400 EBP: f6cb7de0 ESP: f6cb7db8
>>>>>>  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
>>>>>> CR0: 8005003b CR2: 08070680 CR3: 009c8000 CR4: 000006d0
>>>>>> DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
>>>>>> DR6: ffff0ff0 DR7: 00000400
>>>>>> Call Trace:
>>>>>>  [<c0424082>] ? tg_nop+0x0/0xc
>>>>>>  [<c0424082>] ? tg_nop+0x0/0xc
>>>>>>  [<c042406e>] walk_tg_tree+0x63/0x77
>>>>>>  [<c042c23a>] ? tg_shares_up+0x0/0x149
>>>>>>  [<c042e836>] update_shares+0x5d/0x65
>>>>>>  [<c0432af3>] rebalance_domains+0x114/0x460
>>>>>>  [<c0432e75>] run_rebalance_domains+0x36/0xa3
>>>>>>  [<c043c324>] __do_softirq+0xbc/0x173
>>>>>>  [<c043c416>] do_softirq+0x3b/0x5f
>>>>>>  [<c043c52d>] irq_exit+0x3a/0x68
>>>>>>  [<c0417846>] smp_apic_timer_interrupt+0x6d/0x7b
>>>>>>  [<c0403c9b>] apic_timer_interrupt+0x2f/0x34
>>>>>>  [<c0430d37>] ? finish_task_switch+0x5d/0xc4
>>>>>>  [<c0744b11>] schedule+0x74c/0x7b2
>>>>>>  [<c0590e28>] ? trace_hardirqs_on_thunk+0xc/0x10
>>>>>>  [<c0403393>] ? restore_all_notrace+0x0/0x18
>>>>>>  [<c0471e19>] ? watchdog+0x0/0x79
>>>>>>  [<c0471e19>] ? watchdog+0x0/0x79
>>>>>>  [<c0471e63>] watchdog+0x4a/0x79
>>>>>>  [<c0449a53>] kthread+0x70/0x75
>>>>>>  [<c04499e3>] ? kthread+0x0/0x75
>>>>>>  [<c0403e93>] kernel_thread_helper+0x7/0x10
>>>>>> [root@hs40 ltp-full-20090731]# uname -a
>>>>>> Linux hs40.in.ibm.com 2.6.31-rc7 #1 SMP Thu Sep 3 10:14:41 IST 2009 
>>>>>> i686 i686
>>>>>> i386 GNU/Linux
>>>>>> [root@hs40 ltp-full-20090731]#
>>>>>>
>>>>>>       
>>>>>>           
>>>>>>             
>>>> We have been unable to reproduce it on current -tip. Rishi, are you able
>>>> to reproduce it on -tip?
>>>>
>>>> thanks,
>>>>   
>>>>       
>>>>         
>>> I am not able to create container with lxc on -tip kernel with config 
>>> file attached. As soon as i am executing "lxc-execute ..." it hangs 
>>> and only way to recover is to hard reboot system.
>>>     
>>>       
>> enabled the nmi_watchdog on tip kernel and found this call trace on 
>> system while executing "lxc-execute ..." command ( creating container).
>>
>> x335a.in.ibm.com login: BUG: NMI Watchdog detected LOCKUP on CPU1, ip 
>> c075f208, registers:
>> Modules linked in: nfs lockd nfs_acl auth_rpcgss bridge stp llc bnep sco 
>> l2cap bluetooth autofs4 sunrpc ipv6 p4_clockmod dm_multipath uinput 
>> ata_generic pata_acpi pata_serverworks i2c_piix4 floppy tg3 i2c_core 
>> pcspkr serio_raw mptspi mptscsih mptbase scsi_transport_spi [last 
>> unloaded: scsi_wait_scan]
>>
>> Pid: 0, comm: swapper Not tainted (2.6.31-tip #2) eserver xSeries 335 
>> -[867641X]-
>> EIP: 0060:[<c075f208>] EFLAGS: 00000097 CPU: 1
>> EIP is at _spin_lock_irqsave+0x2b/0x39
>> EAX: 00002625 EBX: c3128e00 ECX: 00000000 EDX: 00000200
>> ESI: 00000086 EDI: 00000400 EBP: f70a9d58 ESP: f70a9d50
>>  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
>> Process swapper (pid: 0, ti=f70a8000 task=f7086780 task.ti=f70a8000)
>> Stack:
>>  f6461a80 00000001 f70a9d94 c043335a 00000200 00000400 c31243d8 c3124350
>> <0> c31244c0 c3128e00 c09f3e00 00000086 00000001 00000800 f6461a80 c31243d8
>> <0> c042c0d4 f70a9dac c042c0c0 c0433226 c31243d8 000b71b0 00000000 f70a9dd0
>> Call Trace:
>>  [<c043335a>] ? tg_shares_up+0x134/0x1bb
>>  [<c042c0d4>] ? tg_nop+0x0/0xc
>>  [<c042c0c0>] ? walk_tg_tree+0x63/0x77
>>  [<c0433226>] ? tg_shares_up+0x0/0x1bb
>>  [<c04328f4>] ? update_shares+0x69/0x71
>>  [<c04335ec>] ? select_task_rq_fair+0x153/0x5dc
>>  [<c043b905>] ? try_to_wake_up+0x7f/0x28a
>>  [<c043bb20>] ? default_wake_function+0x10/0x12
>>  [<c042ce2d>] ? __wake_up_common+0x37/0x5e
>>  [<c0430d62>] ? complete+0x30/0x43
>>  [<c0453281>] ? wakeme_after_rcu+0x10/0x12
>>  [<c0482997>] ? __rcu_process_callbacks+0x141/0x201
>>  [<c0482a7c>] ? rcu_process_callbacks+0x25/0x44
>>  [<c0445167>] ? __do_softirq+0xbc/0x173
>>  [<c0445259>] ? do_softirq+0x3b/0x5f
>>  [<c0445371>] ? irq_exit+0x3a/0x6d
>>  [<c041dd82>] ? smp_apic_timer_interrupt+0x6d/0x7b
>>  [<c0408d7b>] ? apic_timer_interrupt+0x2f/0x34
>>  [<c0425854>] ? native_safe_halt+0xa/0xc
>>  [<c040e63b>] ? default_idle+0x4a/0x7c
>>  [<c0460b8d>] ? tick_nohz_restart_sched_tick+0x115/0x123
>>  [<c0407637>] ? cpu_idle+0x58/0x79
>>  [<c075a578>] ? start_secondary+0x19c/0x1a1
>> Code: 55 89 e5 56 53 0f 1f 44 00 00 89 c3 9c 58 8d 74 26 00 89 c6 fa 90 
>> 8d 74 26 00 e8 96 2b d3 ff b8 00 01 00 00 f0 66 0f c1 03 38 e0 <74> 06 
>> f3 90 8a 03 eb f6 89 f0 5b 5e 5d c3 55 89 e5 53 0f 1f 44
>> ---[ end trace 8a14be6828557ade ]---
>> Kernel panic - not syncing: Non maskable interrupt
>> Pid: 0, comm: swapper Tainted: G      D    2.6.31-tip #2
>> Call Trace:
>>  [<c075d4b7>] ? printk+0x14/0x1d
>>  [<c075d3fc>] panic+0x3e/0xe5
>>  [<c075fe2a>] die_nmi+0x86/0xd8
>>  [<c0760324>] nmi_watchdog_tick+0x107/0x16e
>>  [<c075f8bf>] do_nmi+0xa3/0x27f
>>  [<c075f485>] nmi_stack_correct+0x28/0x2d
>>  [<c075f208>] ? _spin_lock_irqsave+0x2b/0x39
>>  [<c043335a>] tg_shares_up+0x134/0x1bb
>>  [<c042c0d4>] ? tg_nop+0x0/0xc
>>  [<c042c0c0>] walk_tg_tree+0x63/0x77
>>  [<c0433226>] ? tg_shares_up+0x0/0x1bb
>>  [<c04328f4>] update_shares+0x69/0x71
>>  [<c04335ec>] select_task_rq_fair+0x153/0x5dc
>>  [<c043b905>] try_to_wake_up+0x7f/0x28a
>>  [<c043bb20>] default_wake_function+0x10/0x12
>>  [<c042ce2d>] __wake_up_common+0x37/0x5e
>>  [<c0430d62>] complete+0x30/0x43
>>  [<c0453281>] wakeme_after_rcu+0x10/0x12
>>  [<c0482997>] __rcu_process_callbacks+0x141/0x201
>>  [<c0482a7c>] rcu_process_callbacks+0x25/0x44
>>  [<c0445167>] __do_softirq+0xbc/0x173
>>  [<c0445259>] do_softirq+0x3b/0x5f
>>  [<c0445371>] irq_exit+0x3a/0x6d
>>  [<c041dd82>] smp_apic_timer_interrupt+0x6d/0x7b
>>  [<c0408d7b>] apic_timer_interrupt+0x2f/0x34
>>  [<c0425854>] ? native_safe_halt+0xa/0xc
>>  [<c040e63b>] default_idle+0x4a/0x7c
>>  [<c0460b8d>] ? tick_nohz_restart_sched_tick+0x115/0x123
>>  [<c0407637>] cpu_idle+0x58/0x79
>>  [<c075a578>] start_secondary+0x19c/0x1a1
>> Rebooting in 1 seconds..
>>
>>
>>   
>>     
>>> I am not sure about tip but i am able to create the problem pretty 
>>> easily on 2.6.31-rc7 with that config file.
>>>
>>> Only the changes i have done in the config file from (2.6.31-rc7) is :
>>>    - Disabled KVM as it was giving me error on -tip kernel.
>>>    - Applied following patch : 
>>> http://www.gossamer-threads.com/lists/linux/kernel/1129527
>>>
>>> Please let me know if you are able to recreate it on -tip with 
>>> following config.
>>> ------------------------------------------------------------------------
>>>
>>> _______________________________________________
>>> Containers mailing list
>>> Containers@lists.linux-foundation.org
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