got it again a few times, even with latest (-25) kernel. 

Here is the trace:

Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000] PREEMPT SMP 
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000] Modules linked in: acpi_sbs i2c_acpi_ec i2c_core battery ac thermal processor fan button 8139too af_packet binfmt_misc rfcomm l2cap bluetooth ipv6 ppdev radeon drm speedstep_ich speedstep_lib cpufreq_userspace cpufreq_stats freq_table cpufreq_powersave cpufreq_ondemand cpufreq_conservative video tc1100_wmi sony_acpi pcc_acpi hotkey dev_acpi container asus_acpi dm_mod md_mod sr_mod sbp2 scsi_mod lp prism54 parport_pc parport joydev pcmcia floppy irtty_sir sir_dev irda crc_ccitt 8139cp yenta_socket rsrc_nonstatic pcmcia_core pcspkr psmouse mii snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundcore serio_raw snd_page_alloc intel_agp agpgart shpchp pci_hotplug evdev tsdev usbhid ext3 jbd ide_generic ohci1394 ieee1394 uhci_hcd usbcore ide_cd cdrom ide_disk piix generic capability commoncap vga16fb vgastate fbcon tileblit font bitblit softcursor
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000] CPU:    0
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000] EIP:    0060:[pg0+946605499/1069184000]    Not tainted VLI
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000] EFLAGS: 00010206   (2.6.15-25-686) 
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000] EIP is at islpci_set_state+0x9b/0xa5 [prism54]
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000] eax: dc396aa0   ebx: 00000000   ecx: 00000003   edx: 00000001
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000] esi: 00000000   edi: 00000001   ebp: d9880000   esp: e37a9e5c
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000] ds: 007b   es: 007b   ss: 0068
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000] Process ifconfig (pid: 8685, threadinfo=e37a8000 task=dfa78a90)
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000] Stack: dc396aa0 f8b172ef dc396aa0 00000003 c0124edb 00000008 d98802b0 dc396aa0 
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]        f8b175d6 dc396aa0 dc396800 dc396800 dc396aa0 dc396800 00000000 f8b1713a 
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]        dc396aa0 00000001 dc396800 ffffffed 00001002 c0293408 dc396800 c0297d74 
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000] Call Trace:
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]  [pg0+946602735/1069184000] islpci_upload_fw+0xaf/0xd0 [prism54]
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]  [printk+27/32] printk+0x1b/0x20
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]  [pg0+946603478/1069184000] islpci_reset+0x116/0x180 [prism54]
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]  [pg0+946602298/1069184000] islpci_open+0x2a/0x70 [prism54]
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]  [dev_open+72/160] dev_open+0x48/0xa0
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]  [dev_mc_upload+36/64] dev_mc_upload+0x24/0x40
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]  [dev_change_flags+94/336] dev_change_flags+0x5e/0x150
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]  [dev_load+45/112] dev_load+0x2d/0x70
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]  [devinet_ioctl+1520/1616] devinet_ioctl+0x5f0/0x650
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]  [do_ioctl+59/160] do_ioctl+0x3b/0xa0
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]  [vfs_ioctl+107/560] vfs_ioctl+0x6b/0x230
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]  [sys_ioctl+136/160] sys_ioctl+0x88/0xa0
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000]  [sysenter_past_esp+84/117] sysenter_past_esp+0x54/0x75
Jun 16 22:05:48 hamerkeuh kernel: [17260439.160000] Code: 4a 89 90 00 04 00 00 83 fa 00 75 b7 b9 01 00 00 00 89 88 fc 03 00 00 eb bc 8b 90 00 04 00 00 eb e6 0f 0b af 03 f8 ac b1 f8 eb 9c <0f> 0b b0 03 f8 ac b1 f8 eb a0 51 e8 b5 43 7f c7 59 e9 64 f6 ff