Public bug reported:

Binary package hint: linux-image-2.6.20-16-generic

Since ipw3945 doesn't work on my Compal HGL30
 (due to the wireless kill switch issue 
http://ubuntuforums.org/showthread.php?t=246074 ), I've been experimenting with 
the new iwlwifi driver, which I found to be in the 2.6.20 Ubuntu kernels (nice!)

I've seen this problem twice now, the last time just after bootup. I go

modprobe -r ipw3945
modprobe -r iwlwifi

to start from scratch. When I go

modprobe iwlwifi

After a few seconds, iwlwifi takes 100% CPU, the computer becomes
unresponsive to keyboard input, then after a while becomes unresponsive
to anything.

This is written to the kern.log:
Jun 20 07:46:26 owl kernel: [  225.844000] ACPI: PCI interrupt for device 
0000:02:00.0 disabled
Jun 20 07:46:26 owl kernel: [  225.852000] ieee80211_crypt: unregistered 
algorithm 'NULL'
Jun 20 07:47:00 owl kernel: [  260.480000] iwlwifi: Intel(R) Wireless Link 
driver for Linux, 0.0.11
Jun 20 07:47:00 owl kernel: [  260.480000] iwlwifi: Copyright(c) 2003-2006 
Intel Corporation
Jun 20 07:47:00 owl kernel: [  260.484000] ACPI: PCI Interrupt 0000:02:00.0[A] 
-> GSI 16 (level, low) -> IRQ 16
Jun 20 07:47:00 owl kernel: [  260.484000] PCI: Setting latency timer of device 
0000:02:00.0 to 64
Jun 20 07:47:00 owl kernel: [  260.484000] iwlwifi: Detected Intel PRO/Wireless 
3945ABG Network Connection
Jun 20 07:47:10 owl kernel: [  270.056000] BUG: soft lockup detected on CPU#0!
Jun 20 07:47:10 owl kernel: [  270.056000]  [softlockup_tick+156/240] 
softlockup_tick+0x9c/0xf0
Jun 20 07:47:10 owl kernel: [  270.056000]  [update_process_times+51/128] 
update_process_times+0x33/0x80
Jun 20 07:47:10 owl kernel: [  270.056000]  [smp_apic_timer_interrupt+112/128] 
smp_apic_timer_interrupt+0x70/0x80
Jun 20 07:47:10 owl kernel: [  270.056000]  [apic_timer_interrupt+40/48] 
apic_timer_interrupt+0x28/0x30
Jun 20 07:47:10 owl kernel: [  270.056000]  [acpi_unmap_lsapic+43/112] 
acpi_unmap_lsapic+0x2b/0x70
Jun 20 07:47:10 owl kernel: [  270.056000]  [<f8a83068>] ipw_read32+0x8/0x10 
[iwlwifi]
Jun 20 07:47:10 owl kernel: [  270.056000]  [<f8a8ace2>] 
ipw_bg_alive_start+0x162/0x10f0 [iwlwifi]
Jun 20 07:47:10 owl kernel: [  270.056000]  [schedule+765/2704] 
__sched_text_start+0x2fd/0xa90
Jun 20 07:47:10 owl kernel: [  270.056000]  [<f8a8312f>] 
ipw_clear_bit+0x1f/0x40 [iwlwifi]
Jun 20 07:47:10 owl kernel: [  270.056000]  [__wake_up+56/80] 
__wake_up+0x38/0x50
Jun 20 07:47:10 owl kernel: [  270.056000]  [run_workqueue+148/320] 
run_workqueue+0x94/0x140
Jun 20 07:47:10 owl kernel: [  270.056000]  [<f8a8ab80>] 
ipw_bg_alive_start+0x0/0x10f0 [iwlwifi]
Jun 20 07:47:10 owl kernel: [  270.056000]  [worker_thread+327/368] 
worker_thread+0x147/0x170
Jun 20 07:47:10 owl kernel: [  270.056000]  [default_wake_function+0/16] 
default_wake_function+0x0/0x10
Jun 20 07:47:10 owl kernel: [  270.056000]  [worker_thread+0/368] 
worker_thread+0x0/0x170
Jun 20 07:47:10 owl kernel: [  270.056000]  [kthread+186/240] kthread+0xba/0xf0
Jun 20 07:47:10 owl kernel: [  270.056000]  [kthread+0/240] kthread+0x0/0xf0
Jun 20 07:47:10 owl kernel: [  270.056000]  [kernel_thread_helper+7/16] 
kernel_thread_helper+0x7/0x10
Jun 20 07:47:10 owl kernel: [  270.056000]  =======================

Here, I think that removing ipw happened at  07:46:26, starting iwlwifi
at 07:47:00 and the lockup at 07:47:10.

** Affects: linux-source-2.6.20 (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
Soft lockup when starting iwlwifi
https://bugs.launchpad.net/bugs/121285
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