I can confirm this bug, it is also present on my machine:
$ uname -a
Linux unix 2.6.22-14-generic #1 SMP Tue Feb 12 07:42:25 UTC 2008 i686 GNU/Linux
$ top
top - 21:01:54 up 1 day, 1:15, 5 users, load average: 0.74, 0.78, 0.71
Tasks: 173 total, 2 running, 171 sleeping, 0 stopped, 0 zombie
Cpu(s): 1.2%us, 3.5%sy, 0.1%ni, 94.0%id, 0.2%wa, 0.3%hi, 0.7%si, 0.0%st
Mem: 2075944k total, 2022020k used, 53924k free, 9652k buffers
Swap: 3911788k total, 360k used, 3911428k free, 1621568k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
7 root 34 19 0 0 0 S 10 0.0 110:01.04 ksoftirqd/1
8752 david 15 0 172m 55m 30m S 2 2.7 2:01.76 amarokapp
20844 david 15 0 2488 1100 792 R 2 0.1 0:00.01 top
1 root 18 0 2952 1852 532 S 0 0.1 0:01.31 init
2 root 12 -5 0 0 0 S 0 0.0 0:00.00 kthreadd
3 root RT -5 0 0 0 S 0 0.0 0:00.00 migration/0
4 root 34 19 0 0 0 S 0 0.0 0:01.88 ksoftirqd/0
5 root RT -5 0 0 0 S 0 0.0 0:00.00 watchdog/0
6 root RT -5 0 0 0 S 0 0.0 0:00.00 migration/1
8 root RT -5 0 0 0 S 0 0.0 0:00.00 watchdog/1
9 root 10 -5 0 0 0 S 0 0.0 0:00.02 events/0
10 root 10 -5 0 0 0 S 0 0.0 0:00.00 events/1
11 root 20 -5 0 0 0 S 0 0.0 0:00.00 khelper
31 root 10 -5 0 0 0 S 0 0.0 0:00.02 kblockd/0
32 root 11 -5 0 0 0 S 0 0.0 0:00.00 kblockd/1
$ cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 35
model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4400+
stepping : 2
cpu MHz : 2310.556
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext
3dnow pni lahf_lm cmp_legacy ts fid vid ttp
bogomips : 4623.99
clflush size : 64
processor : 1
vendor_id : AuthenticAMD
cpu family : 15
model : 35
model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4400+
stepping : 2
cpu MHz : 2310.556
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext
3dnow pni lahf_lm cmp_legacy ts fid vid ttp
bogomips : 4621.35
clflush size : 64
$ cat /proc/interrupts
CPU0 CPU1
0: 145 0 XT-PIC-XT timer
1: 0 2 XT-PIC-XT i8042
2: 0 0 XT-PIC-XT cascade
3: 74007 17032 XT-PIC-XT nvidia
4: 93611 19142 XT-PIC-XT EMU10K1
5: 4565754 766336 XT-PIC-XT sata_nv, ohci1394, cx88[0],
nvidia
8: 2 1 XT-PIC-XT rtc
9: 0 0 XT-PIC-XT acpi
10: 25544 5179 XT-PIC-XT ohci_hcd:usb2
11: 3021120 553172 XT-PIC-XT ehci_hcd:usb1, sata_nv
12: 28662946 12905374 XT-PIC-XT eth0
14: 707706 111242 XT-PIC-XT ide0
NMI: 0 0
LOC: 29042798 24486198
ERR: 51528518
MIS: 0
$ lsmod
Module Size Used by
cdc_ether 7168 0
usbnet 19976 1 cdc_ether
cdc_acm 17184 0
mii 6528 1 usbnet
xt_TCPMSS 5888 1
xt_tcpmss 3200 1
xt_tcpudp 4224 1
iptable_mangle 3840 1
ip_tables 13924 1 iptable_mangle
x_tables 16260 4 xt_TCPMSS,xt_tcpmss,xt_tcpudp,ip_tables
pppoe 15680 2
pppox 4872 1 pppoe
ppp_generic 29332 6 pppoe,pppox
slhc 7552 1 ppp_generic
snd_rtctimer 4384 1
binfmt_misc 12936 1
rfcomm 42136 2
l2cap 26240 11 rfcomm
bluetooth 57060 4 rfcomm,l2cap
nfsd 220912 13
exportfs 7040 1 nfsd
lockd 67592 2 nfsd
sunrpc 172412 8 nfsd,lockd
cpufreq_userspace 5280 0
cpufreq_ondemand 9612 0
cpufreq_powersave 2688 0
cpufreq_stats 7232 0
freq_table 5792 2 cpufreq_ondemand,cpufreq_stats
cpufreq_conservative 8072 0
container 5504 0
dock 10656 0
sbs 19592 0
video 18060 0
ac 6148 0
button 8976 0
battery 11012 0
ipv6 273892 16
sbp2 24072 0
parport_pc 37412 0
lp 12580 0
parport 37448 2 parport_pc,lp
snd_emu10k1_synth 8192 0
snd_emux_synth 35456 1 snd_emu10k1_synth
snd_seq_virmidi 8064 1 snd_emux_synth
snd_seq_midi_emul 7680 1 snd_emux_synth
snd_emu10k1 137248 4 snd_emu10k1_synth
snd_ac97_codec 100644 1 snd_emu10k1
ac97_bus 3200 1 snd_ac97_codec
snd_pcm_oss 44672 0
snd_mixer_oss 17664 1 snd_pcm_oss
snd_pcm 80388 4 snd_emu10k1,snd_ac97_codec,snd_pcm_oss
snd_page_alloc 11400 2 snd_emu10k1,snd_pcm
snd_util_mem 5760 2 snd_emux_synth,snd_emu10k1
snd_hwdep 10244 2 snd_emux_synth,snd_emu10k1
tuner 63144 0
snd_seq_dummy 4740 0
snd_seq_oss 33152 0
joydev 11328 0
snd_seq_midi 9600 0
snd_rawmidi 25728 3 snd_seq_virmidi,snd_emu10k1,snd_seq_midi
cx8800 34944 0
cx88xx 68132 1 cx8800
snd_seq_midi_event 8448 3 snd_seq_virmidi,snd_seq_oss,snd_seq_midi
snd_seq 53232 10
snd_emux_synth,snd_seq_virmidi,snd_seq_midi_emul,snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer 24324 4 snd_rtctimer,snd_emu10k1,snd_pcm,snd_seq
snd_seq_device 9228 8
snd_emu10k1_synth,snd_emux_synth,snd_emu10k1,snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
pcspkr 4224 0
af_packet 24840 4
ir_common 35460 1 cx88xx
xpad 9988 0
nvidia 7822336 40
ide_cd 32672 0
cdrom 37536 1 ide_cd
agpgart 35016 1 nvidia
i2c_algo_bit 7428 1 cx88xx
video_buf 26244 2 cx8800,cx88xx
tveeprom 16784 1 cx88xx
videodev 29312 2 cx8800,cx88xx
v4l1_compat 15364 1 videodev
compat_ioctl32 2304 1 cx8800
v4l2_common 18432 4 tuner,cx8800,cx88xx,videodev
btcx_risc 5896 2 cx8800,cx88xx
usbhid 29536 0
hid 28928 1 usbhid
snd 54660 19
snd_emux_synth,snd_seq_virmidi,snd_emu10k1,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_hwdep,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
k8temp 6656 0
emu10k1_gp 4736 0
gameport 16776 2 emu10k1_gp
soundcore 8800 1 snd
shpchp 34580 0
pci_hotplug 32704 1 shpchp
i2c_nforce2 7040 0
i2c_core 26112 6
tuner,cx88xx,nvidia,i2c_algo_bit,tveeprom,i2c_nforce2
evdev 11136 6
usb_storage 73024 0
ext3 133896 2
jbd 60456 1 ext3
mbcache 9732 1 ext3
sg 36764 0
sd_mod 30336 5
ata_generic 8452 0
libusual 18448 1 usb_storage
r8169 32260 0
ohci1394 36528 0
ieee1394 96312 2 sbp2,ohci1394
amd74xx 15260 0 [permanent]
ide_core 116804 3 ide_cd,usb_storage,amd74xx
sata_nv 20612 3
libata 125168 2 ata_generic,sata_nv
scsi_mod 147084 5 sbp2,usb_storage,sg,sd_mod,libata
ohci_hcd 22916 0
ehci_hcd 36492 0
usbcore 138632 10
cdc_ether,usbnet,cdc_acm,xpad,usbhid,usb_storage,libusual,ohci_hcd,ehci_hcd
thermal 14344 0
processor 32072 1 thermal
fan 5764 0
fuse 47124 1
apparmor 40728 0
commoncap 8320 1 apparmor
$ lspci
00:00.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev a3)
00:01.0 ISA bridge: nVidia Corporation CK804 ISA Bridge (rev f3)
00:01.1 SMBus: nVidia Corporation CK804 SMBus (rev a2)
00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2)
00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3)
00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f2)
00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3)
00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3)
00:09.0 PCI bridge: nVidia Corporation CK804 PCI Bridge (rev f2)
00:0b.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev f3)
00:0c.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev f3)
00:0d.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev f3)
00:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address
Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM
Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Miscellaneous Control
01:00.0 VGA compatible controller: nVidia Corporation G70 [GeForce 7800 GTX]
(rev a1)
02:00.0 VGA compatible controller: nVidia Corporation G70 [GeForce 7800 GTX]
(rev a1)
05:06.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8169 Gigabit
Ethernet (rev 10)
05:07.0 Multimedia audio controller: Creative Labs SB Audigy (rev 04)
05:07.1 Input device controller: Creative Labs SB Audigy Game Port (rev 04)
05:07.2 FireWire (IEEE 1394): Creative Labs SB Audigy FireWire Port (rev 04)
05:08.0 Multimedia video controller: Conexant CX23880/1/2/3 PCI Video and Audio
Decoder (rev 05)
I've booted with irqfixup, which seems to help a little bit but does not take
the problem away. irqpoll just totally makes the machine unusable.
I think that it is the Leadtek Winfast 2000XP Expert card causing the
problem:
$ dmesg | grep -i winfast
[ 13.456000] CORE cx88[0]: subsystem: 107d:6611, board: Leadtek Winfast
2000XP Expert [card=5,autodetected]
[ 13.600000] cx88[0]: Leadtek Winfast 2000XP Expert config: tuner=38,
eeprom[0]=0x01
[ 13.600000] input: cx88 IR (Leadtek Winfast 2000XP as /class/input/input6
Let me know if there is anything I can help with to verify this bug..
--
ksoftirqd/1 using 50% CPU or above
https://bugs.launchpad.net/bugs/183461
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