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Old 08-15-2009, 07:52 AM   #1
john lee
Registered: Jun 2001
Location: Sydney, Australia
Posts: 42

Rep: Reputation: 15
BUG: soft lockup - CPU#1 stuck for 10s! [swapper:0]

Hi all,

I have this DELL PE2950 running Asterisk on RHEL 5 with no problems since Dec last year. We are using Digium TE412P to connect to an E1 ISDN line. Since Dec last year, we did not add or delete any software or hardware. We also did not do any "yum update".

The linux kernel is 2.6.18-92.1.22.el5

Last week, the users reported that people from outside could not dial in but users can dial out. We rebooted the box and everything was fine.

Suddenly, starting this week, the box froze several times a day with a "BUG: soft lockup - CPU#1 stuck for 10s! [swapper:0]" error message on the console. Before it freezes, I can see a continuous stream of error message "timing source auto card 0!" coming up on the machine.

We rebooted and it became okay for a few hours and we had to reboot it again in order to clear the problem.

BUG: soft lockup - CPU#1 stuck for 10s! [swapper:0]
Pid: 0, comm: swapper
EIP: 0060:[,C0417911.] CPU: 1
EIP is at smp_call_function+0x99/0xc3
EFLAGS: 00000297 Tainted: G (2.6.10-92.1.22.e15 #1)
EAX: 00000002 EBX: 00000000 ECX: 00000001 EDX: 000000fb
ESI: 00000003 EDI: 00000000 EBP: c0417ae0 DS: 007B ES: 007b
CR0: 8005003b CR2: b7fec780 CR3: 324B2000 CR4: 000006d0
[<c0417ae0>] stop_this_cpu+0x0/0x33
[<c041794e>] smp_send_stop+0x13/0x1c
[<c0425bcf>] panic+0x4c/0x16d
[<c040da17>] intel_machine_check+0xf9/0x146
[<c040d91e>] intel_machine_check+0x0/0x146
[<c0403ccf>] error_code+0x39/0x40
[<c0403ccf>] mwait_idel+0x25/0x38
[<c0522200>] acpi_processor_idle+0x154/0x3b4
[<c0403c90>] cpu_idle+0x9f/0xb9

Q1. A strange thing is I could not find this error message in /var/log/messages or dmesg. The soft lockup error message can only be found on the machine itself.
Q2. Could it be kernel incompatibility problem? However, we did not ever change anything since it was installed.
Q3. From the error message, how do I know it is a software (kernel?) or hardware problem?

I would appreciate if someone could give me any suggestions.
Old 08-15-2009, 09:38 AM   #2
Senior Member
Registered: Jul 2004
Distribution: Ubuntu 7.04
Posts: 1,991

Rep: Reputation: 76
In general, something must have changed to cause a problem. Two possibilities spring to mind: either a piece of hardware has failed, or someone has broken in to your unpatched system.

I'm not sure if this is what you're seeing, but there is a kernel bug ( which was fixed in 2.6.27 that caused similar error messages. It may be a good idea to update your system and see if the problem goes away.

I'd also run chkrootkit ( just to be on the safe side.

Also, RHEL has technical support: they should be able to tell you if it's hardware problem or not.
Old 07-29-2012, 09:43 PM   #3
john lee
Registered: Jun 2001
Location: Sydney, Australia
Posts: 42

Original Poster
Rep: Reputation: 15
rjlee, thanks for your reply.

Something which I did not tell you in the post - the Asterisk server was connected to a Rhino Channel Bank via a port on the Digium TE412P card. We found out that system would not freeze if we disconnect the Rhino Channel Bank.
We opened a call with Rhino but the guys were very confident that the problem was not caused by Rhino.

Anyway, as we were running out of ideas, we quickly ordered a new Rhino Channel Bank and connected it to the Asterisk server.
Guess what - problem disappeared!
Old 01-05-2015, 06:36 AM   #4
LQ Newbie
Registered: Mar 2014
Posts: 1

Rep: Reputation: Disabled
Same BUG in linux-3.8.13

Am facing the same kernel panic in linux-3.8.13 kernel. Is it related to harware, does it fixed in latest kernel.
Old 01-05-2015, 11:30 PM   #5
john lee
Registered: Jun 2001
Location: Sydney, Australia
Posts: 42

Original Poster
Rep: Reputation: 15
My soft-lockup problem was purely caused by hardware.
I did not apply any software patches in order to fix it.


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