Hi, I've finally succesfully compiled and linked saa7134-alsa driver usingan external alsa-driver and its Module.symvers file. Everything seemsokay, no undefined symbol or something else: - An installed 2.6.30.4 kernel which only builds and brings soundcoreand sound_firmware,- Latest alsa-driver built externally and installed,- Latest saa7134-alsa, cx88-alsa, etc. code from linus-2.6 (seen thatthey don't affected by some API/ABI changes) patched on top of thealsa-driver tarball, I'm copying Module.symvers file generated after building the alsa-driverinto each directory for getting rid of undefined snd_*() symbols. When I plug a saa7134 PCI card and reboot, the -alsa driver isautomatically probed but it immediately oopses. I wonder if this couldbe related to my weird-but-apparently-successful compilation experienceabove? [ 6.876120] Linux video capture interface: v2.00[ 7.089550] saa7130/34: v4l2 driver version 0.2.15 loaded[ 7.089612] saa7134 0000:03:05.0: PCI INT A -> GSI 20 (level, low) ->IRQ 20[ 7.089622] saa7133[0]: found at 0000:03:05.0, rev: 209, irq: 20,latency: 64, mmio: 0xfdbff000[ 7.089631] saa7133[0]: subsystem: 1461:f11d, board: Avermedia PCIpure analog (M135A) [card=149,autodetected][ 7.089659] saa7133[0]: board init: gpio is 40000[ 7.089744] input: saa7134 IR (Avermedia PCI pure as/devices/pci0000:00/0000:00:14.4/0000:03:05.0/input/input6[ 7.089789] IRQ 20/saa7133[0]: IRQF_DISABLED is not guaranteed onshared IRQs[ 7.230265] saa7133[0]: i2c eeprom 00: 61 14 1d f1 54 20 1c 00 43 43a9 1c 55 d2 b2 92[ 7.230274] saa7133[0]: i2c eeprom 10: ff ff ff ff ff 20 ff ff ff ffff ff ff ff ff ff[ 7.230282] saa7133[0]: i2c eeprom 20: 01 40 01 32 32 01 01 43 88 ff00 56 ff ff ff ff[ 7.230289] saa7133[0]: i2c eeprom 30: ff ff ff ff ff ff ff ff ff ffff ff ff ff ff ff[ 7.230296] saa7133[0]: i2c eeprom 40: ff 22 00 c0 96 ff 03 30 15 00ff ff ff ff ff ff[ 7.230302] saa7133[0]: i2c eeprom 50: ff ff ff ff ff ff ff ff ff ffff ff ff ff ff ff[ 7.230309] saa7133[0]: i2c eeprom 60: ff ff ff ff ff ff ff ff ff ffff ff ff ff ff ff[ 7.230316] saa7133[0]: i2c eeprom 70: ff ff ff ff ff ff ff ff ff ffff ff ff ff ff ff[ 7.230323] saa7133[0]: i2c eeprom 80: ff ff ff ff ff ff ff ff ff ffff ff ff ff ff ff[ 7.230330] saa7133[0]: i2c eeprom 90: ff ff ff ff ff ff ff ff ff ffff ff ff ff ff ff[ 7.230337] saa7133[0]: i2c eeprom a0: ff ff ff ff ff ff ff ff ff ffff ff ff ff ff ff[ 7.230344] saa7133[0]: i2c eeprom b0: ff ff ff ff ff ff ff ff ff ffff ff ff ff ff ff[ 7.230350] saa7133[0]: i2c eeprom c0: ff ff ff ff ff ff ff ff ff ffff ff ff ff ff ff[ 7.230357] saa7133[0]: i2c eeprom d0: ff ff ff ff ff ff ff ff ff ffff ff ff ff ff ff[ 7.230364] saa7133[0]: i2c eeprom e0: ff ff ff ff ff ff ff ff ff ffff ff ff ff ff ff[ 7.230371] saa7133[0]: i2c eeprom f0: ff ff ff ff ff ff ff ff ff ffff ff ff ff ff ff[ 7.412095] HDA Intel 0000:00:14.2: PCI INT A -> GSI 16 (level, low)-> IRQ 16[ 7.512683] hda_codec: ALC883: BIOS auto-probing.[ 7.512886] input: HDA Digital PCBeep as/devices/pci0000:00/0000:00:14.2/input/input7[ 7.516862] HDA Intel 0000:01:05.2: PCI INT B -> GSI 19 (level, low)-> IRQ 19[ 7.689107] tuner 1-004b: chip found @ 0x96 (saa7133[0])[ 7.724034] tda829x 1-004b: setting tuner address to 60[ 7.800011] tda829x 1-004b: type set to tda8290+75a[ 8.294455] usblp0: USB Bidirectional printer dev 2 if 0 alt 0 proto2 vid 0x04E8 pid 0x325B[ 8.294500] usbcore: registered new interface driver usblp[ 10.814379] saa7133[0]: dsp access error[ 10.845083] saa7133[0]: registered device video0 [v4l2][ 10.845111] saa7133[0]: registered device vbi0[ 10.845130] saa7133[0]: registered device radio0[ 10.950359] EXT3 FS on sda5, internal journal[ 10.996203] saa7134 ALSA driver for DMA sound loaded[ 10.996217] IRQ 20/saa7133[0]: IRQF_DISABLED is not guaranteed onshared IRQs[ 10.996247] saa7133[0]/alsa: saa7133[0] at 0xfdbff000 irq 20registered as card -1 <-- /* That's interesting? */[ 10.996349] BUG: unable to handle kernel NULL pointer dereference at00000002 <-- ********** 1st null ptr deref[ 10.996962] IP: [<f8834cd4>] snd_pcm_timer_init+0x26/0xd1 [snd_pcm][ 10.997255] *pde = 00000000·[ 10.997255] Oops: 0000 [#1] SMP·[ 10.997255] last sysfs file: /sys/module/saa7134/initstate[ 10.997255] Modules linked in: saa7134_alsa(+) usblp tda827x tda8290snd_hda_codec_atihdmi tuner snd_hda_codec_realtek snd_hda_intelsnd_hda_codec snd_seq_dummy snd_hwdep snd_seq_oss saa7134 snd_seq_midi_event snd_seq snd_seq_device ir_common snd_pcm_oss snd_mixer_ossv4l2_common videodev v4l1_compat videobuf_dma_sg videobuf_core snd_pcmtveeprom snd_timer snd i2c_piix4 shpchp k8temp soundcore snd_page_alloc pcspkr r8169 ati_agp agpgart mii brd ata_generic pata_acpi ahcipata_atiixp libata[ 10.997255]·[ 10.997255] Pid: 1141, comm: modprobe.bin Not tainted (2.6.30.4-126#3) Unknow[ 10.997255] EIP: 0060:[<f8834cd4>] EFLAGS: 00010246 CPU: 1[ 10.997255] EIP is at snd_pcm_timer_init+0x26/0xd1 [snd_pcm][ 10.997255] EAX: 00000002 EBX: f65c0e0c ECX: f6b2fe98 EDX: 00000000[ 10.997255] ESI: f65c0c00 EDI: 00000018 EBP: f6b2febc ESP: f6b2fe98[ 10.997255] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068[ 10.997255] Process modprobe.bin (pid: 1141, ti=f6b2e000task=f6a2caa0 task.ti=f6b2e000)[ 10.997255] Stack:[ 10.997255] 00000003 00000000 c030c2e9 f6b2feb8 f87ca221 00000000f65c0e0c f6921400[ 10.997255] 00000018 f6b2feec f882da8f 00000001 f6921438 f88358e4436d6370 63304432[ 10.997255] f65c0c00 f87cf9fe f69b42a0 f65c0d70 f65c0c00 f6b2fefcf87ce0bb f65c0e0c[ 10.997255] Call Trace:[ 10.997255] [<c030c2e9>] ? device_create_file+0x13/0x15[ 10.997255] [<f87ca221>] ? snd_add_device_sysfs_file+0x67/0x6e [snd][ 10.997255] [<f882da8f>] ? snd_pcm_dev_register+0x176/0x1de [snd_pcm][ 10.997255] [<f87ce0bb>] ? snd_device_register_all+0x27/0x44 [snd][ 10.997255] [<f87cadce>] ? snd_card_register+0x4c/0x131 [snd][ 10.997255] [<f8d17687>] ? alsa_device_init+0x200/0x24b [saa7134_alsa][ 10.997255] [<f8d1773d>] ? saa7134_alsa_init+0x6b/0x93 [saa7134_alsa][ 10.997255] [<c0101137>] ? do_one_initcall+0x4a/0x115[ 10.997255] [<f8d176d2>] ? saa7134_alsa_init+0x0/0x93 [saa7134_alsa][ 10.997255] [<c0145205>] ? __blocking_notifier_call_chain+0x40/0x4c[ 10.997255] [<c015302d>] ? sys_init_module+0x87/0x18b[ 10.997255] [<c01031b4>] ? sysenter_do_call+0x12/0x28[ 11.066012] Code: 00 00 5b 5d c3 55 89 e5 57 56 53 89 c3 83 ec 18 8b53 30 c7 45 e0 00 00 00 00 8d 4d dc c7 45 dc 03 00 00 00 8b 30 83 e2 018b 06 <8b> 00 89 45 e4 8b 46 0c 89 45 e8 8b 43 0c 01 c0 09c2 8d 45 f0·[ 11.066012] EIP: [<f8834cd4>] snd_pcm_timer_init+0x26/0xd1 [snd_pcm]SS:ESP 0068:f6b2fe98[ 11.066012] CR2: 0000000000000002[ 11.066318] ---[ end trace 000b75f3b1903e42 ]---[ 14.079154] r8169: eth0: link up[ 14.095472] r8169: eth0: link up[ 14.335980] r8169: eth0: link up[ 17.074440] NET: Registered protocol family 10[ 17.074879] lo: Disabled Privacy Extensions[ 20.520592] BUG: unable to handle kernel NULL pointer dereference at00000002 <-- ********* 2nd nullptr deref[ 20.535353] IP: [<f8830abf>] snd_pcm_info+0x2e/0xe0 [snd_pcm][ 20.535353] *pde = 00000000·[ 20.559932] Oops: 0000 [#2] SMP·[ 20.559932] last sysfs file:/sys/devices/pci0000:00/0000:00:14.4/0000:03:05.0/sound/card2/pcmC2D0c/pcm_class[ 20.586971] Modules linked in: ipv6 saa7134_alsa(+) usblp tda827xtda8290 snd_hda_codec_atihdmi tuner snd_hda_codec_realtek snd_hda_intelsnd_hda_codec snd_seq_dummy snd_hwdep snd_seq_oss saa7134 snd_seq_midi_event snd_seq snd_seq_device ir_common snd_pcm_osssnd_mixer_oss v4l2_common videodev v4l1_compat videobuf_dma_sgvideobuf_core snd_pcm tveeprom snd_timer snd i2c_piix4 shpchp k8tempsoundcore snd_page_alloc pcspkr r8169 ati_agp agpgart mii brd ata_generic pata_acpiahci pata_atiixp libata[ 20.606741]·[ 20.606741] Pid: 1367, comm: hald Tainted: G D (2.6.30.4-126#3) Unknow[ 20.704561] Process hald (pid: 1367, ti=f660e000task=f6420c70 task.ti=f660e000)[ 20.704561] Stack:[ 20.704561] f65c0e0c f65c0c00 f6ada3f0 f642fe00 f6919ac0 f660fe34f882e15a f65c0e0c[ 20.704561] 00000200 f6ada3f0 f6ada3c0 f6667000 f660fe3c f882e254f660fe70 f87cb9e9[ 20.704561] f680db00 0160fe70 ffffffff f64cb870 f6919ac0 0000100000000020 00000020[ 20.704561] Call Trace:[ 20.704561] [<f882e15a>] ? snd_pcm_proc_info_read+0x80/0x16c [snd_pcm][ 20.704561] [<f882e254>] ? snd_pcm_stream_proc_info_read+0xe/0x10[snd_pcm][ 20.704561] [<f87cb9e9>] ? snd_info_entry_open+0x26b/0x2de [snd][ 20.704561] [<c01df157>] ? proc_reg_open+0xb6/0x122[ 20.704561] [<f87cb6ca>] ? snd_info_entry_release+0x0/0xa7 [snd][ 20.704561] [<c01ac441>] ? __dentry_open+0x119/0x207[ 20.704561] [<c01ac5c9>] ? nameidata_to_filp+0x2c/0x43[ 20.704561] [<c01df0a1>] ? proc_reg_open+0x0/0x122[ 20.704561] [<c01b656b>] ? do_filp_open+0x3ae/0x6c8[ 20.704561] [<c019ff47>] ? free_pages_and_swap_cache+0x44/0x57[ 20.704561] [<c01b6937>] ? getname+0x20/0xb7[ 20.704561] [<c01be23c>] ? alloc_fd+0x55/0xbe[ 20.704561] [<c01ac253>] ? do_sys_open+0x44/0xba[ 20.704561] [<c01ac30b>] ? sys_open+0x1e/0x26[ 20.704561] [<c01031b4>] ? sysenter_do_call+0x12/0x28[ 20.704561] Code: 00 00 00 89 e5 57 56 53 89 d3 83 ec 08 89 df 89 45ec 8b 00 8b 55 ec 89 45 f0 31 c0 8b 72 04 f3 ab 8b 55 f0 b9 40 00 00 008b 02 <8b> 00 89 43 0c 8b 42 0c 8b 55 ec 89 03 8b 42 30 89 43 08 8b 42·[ 20.704561] EIP: [<f8830abf>] snd_pcm_info+0x2e/0xe0 [snd_pcm] SS:ESP0068:f660fe04[ 21.199052] CR2: 0000000000000002[ 21.222000] ---[ end trace 000b75f3b1903e43 ]---[ 20.606741] EIP: 0060:[<f8830abf>] EFLAGS: 00010246 CPU: 1[ 20.704561] EIP is at snd_pcm_info+0x2e/0xe0 [snd_pcm][ 20.704561] EAX: 00000002 EBX: f642fe00 ECX: 00000040 EDX: f65c0c00[ 20.704561] ESI: 00000000 EDI: f642ff20 EBP: f660fe18 ESP: f660fe04[ 20.704561] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 The first dereference is happening at: (gdb) list *snd_pcm_timer_init+0x260x7cf8 is in snd_pcm_timer_init(/var/pisi/module-alsa-driver-1.0.20_20090808-49/work/alsa-driver/acore/../alsa-kernel/core/pcm_timer.c:131).126 struct snd_timer_id tid;127 struct snd_timer *timer;128129 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;130 tid.dev_class = SNDRV_TIMER_CLASS_PCM;131 tid.card = substream->pcm->card->number; <----------132 tid.device = substream->pcm->device;133 tid.subdevice = (substream->number << 1) |(substream->stream & 1);134 if (snd_timer_new(substream->pcm->card, "PCM", &tid,&timer) < 0)135 return;at the following place: Can it be related to a race condition between the sound card and thesaa7134-alsa interface? 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