Hi,

I have some reports of problems with Alsa 1.0.15rc2 and Dell M1210 (dell-m82 model). The following oops happens:

Sep 27 19:28:34 dru kernel: Unable to handle kernel paging request at ffff81107b70f3a0 RIP: Sep 27 19:28:34 dru kernel: [<ffffffff88108751>] :snd_hda_intel:snd_hda_input_mux_info+0x31/0x50 Sep 27 19:28:34 dru kernel: PGD 8063 PUD 0 Sep 27 19:28:34 dru kernel: Oops: 0000 [1] SMP Sep 27 19:28:34 dru kernel: CPU 0 Sep 27 19:28:34 dru kernel: Modules linked in: ipv6 video thermal sbs fan container snd_seq_dummy button snd_seq_oss snd_seq_midi_event snd_seq do ck battery ac ide_cd binfmt_misc loop ntfs nls_utf8 nls_cp437 vfat fat dm_mirror dm_mod usb_storage ide_core hidp l2cap usbmouse usbhid ff_memless usbkbd hci_usb bluetooth cpufreq_ondemand cpufreq_conservative cpufreq_powersave acpi_cpufreq freq_table processor nvram pcspkr snd_usb_lib snd_r awmidi snd_seq_device b44 snd_pcm_oss snd_mixer_oss ssb pcmcia pcmcia_core uhci_hcd ehci_hcd usbcore mii ohci1394 ieee1394 i2c_i801 i2c_core evdev snd_hda_intel snd_pcm snd_timer snd_page_alloc snd_hwdep joydev tsdev mmc_block sdhci mmc_core snd soundcore iTCO_wdt iTCO_vendor_support sg sr_m od ext3 jbd scsi_wait_scan sd_mod ahci ata_piix libata scsi_mod Sep 27 19:28:34 dru kernel: Pid: 3466, comm: alsactl Not tainted 2.6.22.9-laptop-1mdv #1 Sep 27 19:28:34 dru kernel: RIP: 0010:[<ffffffff88108751>] [<ffffffff88108751>] :snd_hda_intel:snd_hda_input_mux_info+0x31/0x50 Sep 27 19:28:34 dru kernel: RSP: 0018:ffff81007aa65d48 EFLAGS: 00010206 Sep 27 19:28:34 dru kernel: RAX: 0000000ffffffff0 RBX: ffff81007b734d80 RCX: 00000000ffffffff Sep 27 19:28:34 dru kernel: RDX: 0000000000000000 RSI: ffff81007aa65d88 RDI: ffff81007aa65de0 Sep 27 19:28:34 dru kernel: RBP: ffff81007aa65d88 R08: ffff81007b70f3a8 R09: 000000000000000a Sep 27 19:28:34 dru kernel: R10: 0000000000000000 R11: 0000000000000246 R12: ffff81007c44a968 Sep 27 19:28:34 dru kernel: R13: ffff81007c44a800 R14: ffff81007adbaf40 R15: 00007fff95ccbdb0 Sep 27 19:28:34 dru kernel: FS: 00002ad615cc6e50(0000) GS:ffffffff8053e000(0000) knlGS:0000000000000000 Sep 27 19:28:34 dru kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b Sep 27 19:28:34 dru kernel: CR2: ffff81107b70f3a0 CR3: 000000007a926000 CR4: 00000000000006e0 Sep 27 19:28:34 dru kernel: Process alsactl (pid: 3466, threadinfo ffff81007aa64000, task ffff81007c659860) Sep 27 19:28:34 dru kernel: Stack: 00007fff95ccbdb0 ffffffff880b3835 0000000000000000 00007fff95ccbdb0 Sep 27 19:28:34 dru kernel: 00000000c1105511 ffff81007c44a800 ffff81007adbaf40 ffffffff880b4d88 Sep 27 19:28:34 dru kernel: 0000000000000001 0000000000000000 0000000000000000 0000000000000000 Sep 27 19:28:34 dru kernel: Call Trace: Sep 27 19:28:34 dru kernel: [<ffffffff880b3835>] :snd:snd_ctl_elem_info+0x55/0x150 Sep 27 19:28:34 dru kernel: [<ffffffff880b4d88>] :snd:snd_ctl_ioctl+0x648/0x8b0 Sep 27 19:28:34 dru kernel: [<ffffffff802aa045>] do_ioctl+0x35/0xe0 Sep 27 19:28:34 dru kernel: [<ffffffff802aa310>] vfs_ioctl+0x220/0x2c0 Sep 27 19:28:34 dru kernel: [<ffffffff802aa445>] sys_ioctl+0x95/0xb0 Sep 27 19:28:34 dru kernel: [<ffffffff8020a28e>] system_call+0x7e/0x83 Sep 27 19:28:34 dru kernel: Sep 27 19:28:34 dru kernel: Sep 27 19:28:34 dru kernel: Code: 49 8b 74 00 08 e8 95 bd 21 f8 31 c0 48 83 c4 08 c3 0f 1f 80 Sep 27 19:28:34 dru kernel: RIP [<ffffffff88108751>] :snd_hda_intel:snd_hda_input_mux_info+0x31/0x50 Sep 27 19:28:34 dru kernel: RSP <ffff81007aa65d48> Sep 27 19:28:34 dru kernel: CR2: ffff81107b70f3a0

I have a better report on a i386 kernel, unfortunately it's tainted:

BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000 printing eip: f8f89ed8 *pde = 00000000 Oops: 0000 [#1] SMP Modules linked in: snd_usb_audio snd_usb_lib snd_rawmidi snd_seq_device iwl3945 mac80211 cfg80211 b44 mmc_block nvidia(P) snd_hda_intel snd_pcm ohci1394 snd_timer ssb pcmcia sdhci pcmcia_core mii ieee1394 mmc_core joydev ipw3945 ieee80211 ehci_hcd snd_page_alloc snd_hwdep uhci_hcd ieee80211_crypt snd intel_agp i2c_i801 tsdev usbcore soundcore sg agpgart evdev i2c_core iTCO_wdt iTCO_vendor_support sr_mod reiserfs scsi_wait_scan sd_mod ahci ata_piix libata scsi_mod CPU: 0 EIP: 0060:[<f8f89ed8>] Tainted: P VLI EFLAGS: 00010246 (2.6.22.7-laptop-1mdv #1) EIP is at snd_hda_input_mux_info+0x38/0x50 [snd_hda_intel] eax: f6764a4c ebx: 00000000 ecx: ffffffff edx: f6269de4 esi: 00000000 edi: f6269e3c ebp: f6269db0 esp: f6269da4 ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068 Process alsactl (pid: 2318, ti=f6268000 task=c237a550 task.ti=f6268000) Stack: f66da5c0 00000000 f6269de4 f6269db8 f8f995e4 f6269f48 f8edd1eb 00000000 bf979c70 f64fcac0 f66b6c00 f66b6d4c f8cf0000 f66b6d4c c0199456 00000000 00000001 00000002 00000000 00000000 75706e49 6f532074 65637275 00000000 Call Trace: [<c010529a>] show_trace_log_lvl+0x1a/0x30 [<c010535b>] show_stack_log_lvl+0xab/0xd0 [<c0105551>] show_registers+0x1d1/0x2d0 [<c0105768>] die+0x118/0x240 [<c0121399>] do_page_fault+0x199/0x630 [<c0313e6a>] error_code+0x72/0x78 [<f8f995e4>] stac92xx_mux_enum_info+0x14/0x20 [snd_hda_intel] [<f8edd1eb>] snd_ctl_ioctl+0x80b/0xc30 [snd] [<c018f308>] do_ioctl+0x28/0xb0 [<c018f5af>] vfs_ioctl+0x21f/0x2a0 [<c018f689>] sys_ioctl+0x59/0x70 [<c01041ba>] sysenter_past_esp+0x6b/0xa1 ======================= Code: 08 8d 7a 58 89 1c 24 c7 42 40 03 00 00 00 c7 42 48 01 00 00 00 8b 08 89 4a 50 8b 4a 54 8b 18 8d 73 ff 39 d9 0f 43 ce 8b 74 c8 04 <ac> aa 84 c0 75 fa 8b 1c 24 31 c0 8b 74 24 04 8b 7c 24 08 89 ec EIP: [<f8f89ed8>] snd_hda_input_mux_info+0x38/0x50 [snd_hda_intel] SS:ESP 0068:f6269da4

Accordingly to one of the reporters, when changing the model to 5stack the oops doesn't happens anymore and everything works flawlessly. At first I thought that the problem could be the different pin cfgs of dell-m82 compared to the old and replaced dell model. I was in contact with one of the reporters, but unfortunately reverting only the pin cfg didn't work (if the report was correct the module now didn't break with an oops but sound didn't work either). So I'm out of ideas, failed to see why stac92xx_mux_enum_info received uinfo == NULL (where uinfo comes from?) and passed it to snd_hda_input_mux_info.

-- []'s Herton