On Thu, 09 Nov 2006 09:22:09 -0500
Eric Buddington <[email protected]> wrote:
> Kernel 2.6.19-rc4-mm2 on an Athlon XP / SiS 741 motherboard chipset
>
> In the process of modprobe-ing all the sound modules to figure out
> which I needed (is that kosher? Well, I did it anyway), I got the
> following BUG. Share and enjoy.
>
> [ 673.745969] BUG: unable to handle kernel NULL pointer dereference at virtual address 00000064
> [ 673.745974] printing eip:
> [ 673.745977] c02d1ae5
> [ 673.745979] *pde = 00000000
> [ 673.745986] Oops: 0000 [#1]
> [ 673.745988] PREEMPT
> [ 673.745992] last sysfs file: /devices/pci0000:00/0000:00:00.0/class
> [ 673.746131] CPU: 0
> [ 673.746133] EIP: 0060:[<c02d1ae5>] Not tainted VLI
> [ 673.746135] EFLAGS: 00010246 (2.6.19-rc4-mm2 #1)
> [ 673.746150] EIP is at device_del+0x8/0x156
> [ 673.746154] eax: 00000000 ebx: 00000000 ecx: c1aff240 edx: c1679380
> [ 673.746159] esi: 00000000 edi: 0000ffff ebp: d0bd9cd0 esp: d0bd9cc4
> [ 673.746162] ds: 007b es: 007b ss: 0068
> [ 673.746166] Process modprobe (pid: 5689, ti=d0bd8000 task=f50eb1b0 task.ti=d0bd8000)
> [ 673.746169] Stack: 00000000 d085ee00 0000ffff d0bd9cdc c02d1c3e d085ee00 d0bd9cf4 f8a196e3
> [ 673.746177] d0bd9cf4 f8a19d5b 00000000 00000000 d0bd9d1c f8a19ea4 ee290000 00000286
> [ 673.746185] ee290000 ffffffed 0000ffff ee290000 ffffffed 0000ffff d0bd9d88 f8c18539
> [ 673.746192] Call Trace:
> [ 673.746212] [<c02d1c3e>] device_unregister+0xb/0x15
> [ 673.746220] [<f8a196e3>] snd_card_do_free+0xe6/0xf5 [snd]
> [ 673.746264] [<f8a19ea4>] snd_card_free+0x77/0x81 [snd]
> [ 673.746283] [<f8c18539>] snd_serial_probe+0x47a/0x528 [snd_serial_u16550]
> [ 673.746329] [<c02d49ee>] platform_drv_probe+0xf/0x11
> [ 673.746339] [<c02d3682>] really_probe+0x79/0x105
> [ 673.746349] [<c02d37a3>] driver_probe_device+0x95/0xa1
> [ 673.746357] [<c02d37b7>] __device_attach+0x8/0xa
> [ 673.746363] [<c02d2c5d>] bus_for_each_drv+0x37/0x60
> [ 673.746371] [<c02d3830>] device_attach+0x62/0x76
> [ 673.746377] [<c02d2bd2>] bus_attach_device+0x21/0x42
> [ 673.746384] [<c02d1fa1>] device_add+0x2a8/0x3eb
> [ 673.746390] [<c02d4ce1>] platform_device_add+0xee/0x11e
> [ 673.746398] [<c02d4ede>] platform_device_register_simple+0x35/0x4b
> [ 673.746405] [<f8c18079>] alsa_card_serial_init+0x39/0x7f [snd_serial_u16550]
Yup, trivial to reproduce: modprobe snd_serial_u16550 -> splat.
Bisection indicates that this oops is triggered by
gregkh-driver-sound-device.patch.
snd_serial_probe() never got to call snd_card_register(), so card->dev is
NULL.
snd_serial_probe() calls snd_card_free(card) on the error path and
snd_card_do_free() does device_del(card->dev) which oopses over the null
pointer it got.
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