I've been receiving "BUG: soft lockup - CPU#0 stuck for 11s!
[kacpi_notify:45]" regularly since I upgrade to 8.04 and its degrading
my server's performance considerably.

In case anyone is unaware of what happens when there is a soft lockup,
I am unable to run any commands via SSH or tty1. It'll catch up what I
typed, but I'm just lucky this is a backup server and not a high
performance one!

I'm hoping someone can help me diagnose the cause because this error
did not occur when I had 7.04 and 7.10 installed.

$ lspci:

00:00.0 Host bridge: Intel Corporation 82845G/GL[Brookdale-G]/GE/PE
DRAM Controller/Host-Hub Interface (rev 03)
00:02.0 VGA compatible controller: Intel Corporation
82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM
(ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM
(ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM
(ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M)
USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 82)
00:1f.0 ISA bridge: Intel Corporation 82801DB/DBL (ICH4/ICH4-L) LPC
Interface Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801DB (ICH4) IDE Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M)
SMBus Controller (rev 02)
00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM
(ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 02)
02:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)
02:0a.0 Communication controller: Agere Systems LT WinModem (rev 02)

$ tail /var/log/syslog, tail /var/log/messages, tail /var/log/kern.log
(all the same) and it seems to occur every two seconds or so

Jun 21 16:58:49 backupserver kernel: [ 1727.373171] ACPI: Unable to
turn cooling device [f7c442a0] 'off'
Jun 21 16:58:49 backupserver kernel: [ 1727.377371] ACPI:
Transitioning device [FAN1] to D3
Jun 21 16:58:49 backupserver kernel: [ 1727.377375] ACPI:
Transitioning device [FAN1] to D3
Jun 21 16:58:49 backupserver kernel: [ 1727.377378] ACPI: Unable to
turn cooling device [f7c442a0] 'off'
Jun 21 16:58:49 backupserver kernel: [ 1727.381573] ACPI:
Transitioning device [FAN1] to D3
Jun 21 16:58:49 backupserver kernel: [ 1727.381576] ACPI:
Transitioning device [FAN1] to D3
Jun 21 16:58:49 backupserver kernel: [ 1727.381579] ACPI: Unable to
turn cooling device [f7c442a0] 'off'
Jun 21 16:58:49 backupserver kernel: [ 1727.385781] ACPI:
Transitioning device [FAN1] to D3
Jun 21 16:58:49 backupserver kernel: [ 1727.385785] ACPI:
Transitioning device [FAN1] to D3
Jun 21 16:58:49 backupserver kernel: [ 1727.385787] ACPI: Unable to
turn cooling device [f7c442a0] 'off'

$ cat /proc/cpuinfo:

processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Celeron(R) CPU 2.40GHz
stepping : 9
cpu MHz : 2392.445
cache size : 128 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe up pebs bts
sync_rdtsc cid xtpr
bogomips : 4788.29
clflush size : 64

$ uname -r:

2.6.24-16-server

Is this kernel specific? Does this have to do with my CPU? Do I need
to turn acpi off? (because I've already turned acpi off in
/boot/grun/menu.lst)

Any suggestions would be appreciated. Thanks!

Brett Alton
brett.jr.alton@gmail.com

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Brett Alton wrote:
> $ uname -r:
>
> 2.6.24-16-server
>
> Is this kernel specific? Does this have to do with my CPU? Do I need
> to turn acpi off? (because I've already turned acpi off in
> /boot/grun/menu.lst)
>
upgrade to the latest ubuntu server kernel?
that is not the latest one - get the one from security.ubuntu.com
I think it fixes this bug, at least it did for me


dave

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Thanks for the tips about dist-upgrade (it worked), but my server is
still locking up.

So maybe it's not the kernel?

What else can I do besides backport to 7.10?

Brett Alton
brett.jr.alton@gmail.com

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