System is a AMD K6-III/450.  This is actually a 2.6.25-rcX issue
that I'm just getting around to reporting.  Sorry about that...

------------[ cut here ]------------
WARNING: at arch/x86/pci/irq.c:263 pirq_via586_get+0x23/0x42()
Modules linked in: snd_emu10k1(+) snd_rawmidi firmware_class snd_ac97_codec ac97_bus snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem snd_hwdep snd soundcore ipv6 usbmouse usbhid ff_memless uhci_hcd ehci_hcd usbcore binfmt_misc
Pid: 1784, comm: modprobe Not tainted 2.6.25-rc7 #1
 [<c0115b43>] warn_on_slowpath+0x40/0x4f
 [<c012755b>] run_hrtimer_pending+0xac/0xc5
 [<c011cc32>] run_timer_softirq+0x152/0x16b
 [<c0119b8c>] __do_softirq+0x59/0x85
 [<c027246b>] pci_conf1_read+0xac/0xc5
 [<c027334f>] raw_pci_read+0x3f/0x47
 [<c027246b>] pci_conf1_read+0xac/0xc5
 [<c027334f>] raw_pci_read+0x3f/0x47
 [<c0273421>] pci_read+0x1c/0x23
 [<c01f5bce>] pci_bus_read_config_byte+0x37/0x6c
 [<c01f5be8>] pci_bus_read_config_byte+0x51/0x6c
 [<c0272cef>] pirq_via586_get+0x23/0x42
 [<c0272ccc>] pirq_via586_get+0x0/0x42
 [<c0272fa7>] pcibios_lookup_irq+0x1da/0x355
 [<c0273152>] pirq_enable_irq+0x30/0x91
 [<c0273403>] pcibios_enable_device+0x21/0x23
 [<c01f798b>] do_pci_enable_device+0x1f/0x34
 [<c01f79f8>] __pci_enable_device_flags+0x58/0x64
 [<d8c51bb6>] snd_emu10k1_create+0x2f/0x5fb [snd_emu10k1]
 [<d8b87f5b>] snd_card_new+0x1f6/0x24a [snd]
 [<d8c5196e>] snd_card_emu10k1_probe+0xd2/0x2eb [snd_emu10k1]
 [<c01f8d59>] pci_device_probe+0x36/0x57
 [<c022f7d7>] driver_probe_device+0xb7/0x128
 [<c022f8d5>] __driver_attach+0x0/0x75
 [<c022f919>] __driver_attach+0x44/0x75
 [<c022ede5>] bus_for_each_dev+0x38/0x5a
 [<c022f670>] driver_attach+0x11/0x13
 [<c022f8d5>] __driver_attach+0x0/0x75
 [<c022f493>] bus_add_driver+0x8f/0x1ac
 [<c022fae2>] driver_register+0x45/0x99
 [<c01f8f46>] __pci_register_driver+0x2b/0x59
 [<c01316c2>] sys_init_module+0x14cc/0x1624
 [<c01584af>] do_sync_read+0xbe/0xfd
 [<d8c00552>] snd_pcm_format_width+0x0/0x1c [snd_pcm]
 [<c0158edb>] sys_read+0x3e/0x65
 [<c0102a42>] syscall_call+0x7/0xb
 =======================
---[ end trace 2f9d040b1fc63cd8 ]---

-- 
------------------------------------------------------------------------
Bob Tracy          |  "I was a beta tester for dirt.  They never did
rct@frus.com       |   get all the bugs out." - Steve McGrew on /.
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