Takashi Iwai wrote On 06-08-2009 17:13:> At Thu, 06 Aug 2009 16:41:27 +0300,> Ozan Çağlayan wrote:> >> Takashi Iwai wrote On 17-07-2009 12:45:>> >>> At Fri, 17 Jul 2009 11:33:08 +0200,>>> I wrote:>>> >>> >>>> At Thu, 16 Jul 2009 22:51:50 +0300,>>>> Ozan Çağlayan wrote:>>>> >>>> >>>>> Hi,>>>>>>>>>> One of our users is having a NULL ptr dereference upon loading the>>>>> snd_hda_intel module with 20090624's snapshot. There's only one commit>>>>> after that date in patch_sigmatel.c so I didn't tell him to try with the>>>>> latest snapshot but if you think that the bug may be related to another>>>>> part of the ALSA codebase, I can make him try the latest snapshot.>>>>> >>>>> >>>> I suppose you are using unstable tree, right?>>>> >>>> >>> Looking through the stack trace, it's not...>>> >>> >> Okay I've founded the problem. Here's the relevant code portion that>> I've got from gdb:>>>> (gdb) list *cxt5051_init+0x90>> 0xdf4 is in cxt5051_init>> (/var/pisi/alsa-driver-1.0.20_20090805-41/work/alsa-driver/pci/hda/../../alsa-kernel/pci/hda/patch_conexant.c:384).>> 379 jack->type = type;>> 380>> 381 err = snd_jack_new(codec->bus->card, name, type,>> &jack->jack);>> 382 if (err < 0)>> 383 return err;>> 384 jack->jack->private_data = jack;>> 385 jack->jack->private_free = conexant_free_jack_priv;>> 386 return 0;>> 387 }>> 388>> >> So, either jack or jack->jack is a wrong value, likely NULL. Could> you add a debug print to verify that?> Added the following lines: printk(KERN_INFO "0x%p\n", jack);printk(KERN_INFO "0x%p\n", jack->jack);printk(KERN_INFO "0x%p\n", jack->jack->private_data); dmesg: NVRM: loading NVIDIA UNIX x86 Kernel Module 180.51 Thu Apr 16 19:02:15PDT 2009ACPI: PCI Interrupt 0000:00:1b.0[A] -> GSI 22 (level, low) -> IRQ 22PCI: Setting latency timer of device 0000:00:1b.0 to 640xf777a6140x00000000BUG: unable to handle kernel NULL pointer dereference at 00000074IP: [<f93f2d97>] :snd_hda_codec_conexant:conexant_add_jack+0x57/0x81*pde = 00000000·Oops: 0000 [#1] SMP _______________________________________________Alsa-devel mailing listAlsa-devel@xxxxxxxxxxxxxxxxxxxx://mailman.alsa-project.org/mailman/listinfo/alsa-devel
