Even though I no longer get kernel panics from iwlagn, the bug is still not completely fixed. Once in a while I get these traces in my messages. Wireless is disabled, and modprobe -r && modprobe, nor rmmod or insmod will reload the iwlagn (nor cfg80211, iwlcore, mac80211, ...) module. A reboot is required to get wireless up and working again.

Hardware: HP Compaq 8710W, Core 2 Duo T7700 @ 2.40, 2gb ram,  Mobile PM965/GM965/GL960 chipset,  82801H (ICH8) USB, Intel Corporation PRO/Wireless 4965 AG or AGN [Kedron] Network Connection (rev 61) wireless...

Kernel: Linux oc-laptop 2.6.28-7-generic #20-Ubuntu SMP Mon Feb 9 15:42:34 UTC 2009 x86_64 GNU/Linux
OS: Ubuntu Jaunty

Call trace:

Feb 14 19:20:51 oc-laptop kernel: [16006.397148] iwlagn/0: page allocation failure. order:4, mode:0x40d0
Feb 14 19:20:51 oc-laptop kernel: [16006.397150] Pid: 2266, comm: iwlagn/0 Tainted: P           2.6.28-7-generic #20-Ubuntu
Feb 14 19:20:51 oc-laptop kernel: [16006.397152] Call Trace:
Feb 14 19:20:51 oc-laptop kernel: [16006.397159]  [<ffffffff802b38fe>] __alloc_pages_internal+0x3ee/0x500
Feb 14 19:20:51 oc-laptop kernel: [16006.397176]  [<ffffffffa0971537>] ? iwl_tx_queue_init+0x57/0x180 [iwlcore]
Feb 14 19:20:51 oc-laptop kernel: [16006.397179]  [<ffffffff802b3a8e>] __get_free_pages+0x1e/0x60
Feb 14 19:20:51 oc-laptop kernel: [16006.397185]  [<ffffffffa096f8e9>] iwl_tx_queue_alloc+0x39/0x1a0 [iwlcore]
Feb 14 19:20:51 oc-laptop kernel: [16006.397191]  [<ffffffffa09715a8>] iwl_tx_queue_init+0xc8/0x180 [iwlcore]
Feb 14 19:20:51 oc-laptop kernel: [16006.397198]  [<ffffffffa09719ac>] iwl_txq_ctx_reset+0x18c/0x1e0 [iwlcore]
Feb 14 19:20:51 oc-laptop kernel: [16006.397204]  [<ffffffffa096af8b>] iwl_hw_nic_init+0xfb/0x160 [iwlcore]
Feb 14 19:20:51 oc-laptop kernel: [16006.397212]  [<ffffffffa098c10b>] __iwl4965_up+0xbb/0x2f0 [iwlagn]
Feb 14 19:20:51 oc-laptop kernel: [16006.397225]  [<ffffffffa098c340>] ? iwl4965_bg_up+0x0/0x60 [iwlagn]
Feb 14 19:20:51 oc-laptop kernel: [16006.397230]  [<ffffffffa098c379>] iwl4965_bg_up+0x39/0x60 [iwlagn]
Feb 14 19:20:51 oc-laptop kernel: [16006.397233]  [<ffffffff8026127a>] run_workqueue+0xba/0x190
Feb 14 19:20:51 oc-laptop kernel: [16006.397235]  [<ffffffff80261557>] worker_thread+0xa7/0x120
Feb 14 19:20:51 oc-laptop kernel: [16006.397238]  [<ffffffff802658d0>] ? autoremove_wake_function+0x0/0x40
Feb 14 19:20:51 oc-laptop kernel: [16006.397240]  [<ffffffff802614b0>] ? worker_thread+0x0/0x120
Feb 14 19:20:51 oc-laptop kernel: [16006.397242]  [<ffffffff80265469>] kthread+0x49/0x90
Feb 14 19:20:51 oc-laptop kernel: [16006.397245]  [<ffffffff80213979>] child_rip+0xa/0x11
Feb 14 19:20:51 oc-laptop kernel: [16006.397247]  [<ffffffff80265420>] ? kthread+0x0/0x90
Feb 14 19:20:51 oc-laptop kernel: [16006.397249]  [<ffffffff8021396f>] ? child_rip+0x0/0x11
Feb 14 19:20:51 oc-laptop kernel: [16006.397251] Mem-Info:
Feb 14 19:20:51 oc-laptop kernel: [16006.397252] DMA per-cpu:
Feb 14 19:20:51 oc-laptop kernel: [16006.397253] CPU    0: hi:    0, btch:   1 usd:   0
Feb 14 19:20:51 oc-laptop kernel: [16006.397254] CPU    1: hi:    0, btch:   1 usd:   0
Feb 14 19:20:51 oc-laptop kernel: [16006.397256] DMA32 per-cpu:
Feb 14 19:20:51 oc-laptop kernel: [16006.397257] CPU    0: hi:  186, btch:  31 usd:   0
Feb 14 19:20:51 oc-laptop kernel: [16006.397258] CPU    1: hi:  186, btch:  31 usd:   0
Feb 14 19:20:51 oc-laptop kernel: [16006.397261] Active_anon:114292 active_file:46871 inactive_anon:40787
Feb 14 19:20:51 oc-laptop kernel: [16006.397262]  inactive_file:189586 unevictable:4 dirty:35156 writeback:292 unstable:0
Feb 14 19:20:51 oc-laptop kernel: [16006.397262]  free:38196 slab:53567 mapped:18186 pagetables:4974 bounce:0
Feb 14 19:20:51 oc-laptop kernel: [16006.397265] DMA free:6696kB min:12kB low:12kB high:16kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB present:5668kB pages_scanned:0 all_unreclaimable? no
Feb 14 19:20:51 oc-laptop kernel: [16006.397267] lowmem_reserve[]: 0 2003 2003 2003
Feb 14 19:20:51 oc-laptop kernel: [16006.397271] DMA32 free:146088kB min:5720kB low:7148kB high:8580kB active_anon:457168kB inactive_anon:163148kB active_file:187484kB inactive_file:758344kB unevictable:16kB present:2052004kB pages_scanned:0 all_unreclaimable? no
Feb 14 19:20:51 oc-laptop kernel: [16006.397273] lowmem_reserve[]: 0 0 0 0
Feb 14 19:20:51 oc-laptop kernel: [16006.397276] DMA: 2*4kB 2*8kB 1*16kB 4*32kB 4*64kB 3*128kB 3*256kB 2*512kB 0*1024kB 0*2048kB 1*4096kB = 6696kB
Feb 14 19:20:51 oc-laptop kernel: [16006.397283] DMA32: 35264*4kB 121*8kB 152*16kB 38*32kB 1*64kB 1*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 146120kB
Feb 14 19:20:51 oc-laptop kernel: [16006.397290] 239830 total pagecache pages
Feb 14 19:20:51 oc-laptop kernel: [16006.397291] 812 pages in swap cache
Feb 14 19:20:51 oc-laptop kernel: [16006.397292] Swap cache stats: add 6198, delete 5386, find 2278/2312
Feb 14 19:20:51 oc-laptop kernel: [16006.397294] Free swap  = 4779676kB
Feb 14 19:20:51 oc-laptop kernel: [16006.397295] Total swap = 4803392kB
Feb 14 19:20:51 oc-laptop kernel: [16006.408203] 524208 pages RAM
Feb 14 19:20:51 oc-laptop kernel: [16006.408205] 15519 pages reserved
Feb 14 19:20:51 oc-laptop kernel: [16006.408207] 210729 pages shared
Feb 14 19:20:51 oc-laptop kernel: [16006.408208] 288648 pages non-shared
Feb 14 19:37:12 oc-laptop -- MARK --