Re: NULL pointer dereference

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Hi Kevin,
Yes, only the alsa-drivers need be built/installed-these are what agrsm
interacts with.

This may be the result of DKMS's build environment.

Can you try building the agrsm drivers from source (not DKMS) too?
The package I use on my system is here:

http://linmodems.technion.ac.il/packages/ltmodem/11c11040/agrsm-2.6.30.tar.bz2

Best,
Bjorn.

On 02/02/2010 03:35 PM, Kevin Fernandez wrote:
> Should I recompile only alsa-drivers 1.0.20?
> I've installed it, reinstalled the module with dkms, and got this
> while inserting:
> FATAL: Error inserting agrmodem
> (/lib/modules/2.6.31-18-generic/updates/dkms/agrmodem.ko): Unknown
> symbol in module, or unknown parameter (see dmesg
> 
> and in dmesg:
> 
> [  206.082405] agrmodem: disagrees about version of symbol snd_cards
> [  206.082415] agrmodem: Unknown symbol snd_cards
> [  206.083454] agrmodem: disagrees about version of symbol snd_hda_codec_read
> [  206.083460] agrmodem: Unknown symbol snd_hda_codec_read
> [  206.084078] agrmodem: disagrees about version of symbol snd_hda_codec_write
> [  206.084084] agrmodem: Unknown symbol snd_hda_codec_write
> 
> Thanks!
> Kevin
> 
> 2010/2/2 Bjorn Wielens <Uniacke1@xxxxxxxx>:
>> Hey,
>> Definitely looks like an ALSA issue.... The problem seems to be here:
>>
>> chip_temp = snd_cards[0]->private_data;  //probe
>> bus_temp = chip_temp->bus;
>>
>> and if I'm not mistaken, the agrsm grabs the snd_cards from ALSA.
>>
>> Bjorn.
>>
>> On 02/02/2010 02:43 PM, Kevin Fernandez wrote:
>>> Got this output now, after doing what you asked me:
>>>
>>> [ 1762.812880] Loading module Agere Modem Controller driver version
>>> 2.1.80 (2007-10-01)
>>> [ 1762.812887] Disabling lock debugging due to kernel taint
>>> [ 1765.337117] serial8250_register_ports: BaseAddress 0x8004 Irq 20
>>> [ 1765.337124] ttyAGS3 at I/O 0x8004 (irq = 20) is a AgereModem
>>> [ 1765.337198] agrserial - ret_val 0, call: lt_modem_ops.init_modem
>>> [ 1765.337203] Loading module Agere Modem Interface driver version
>>> 2.1.80.0 (2007-10-01)
>>> [ 1794.432614] ==> codecType = 0x32
>>> [ 1794.432654] BUG: unable to handle kernel NULL pointer dereference at 00000168
>>> [ 1794.432666] IP: [<fc97b88d>] HDAdump+0xd/0x80 [agrmodem]
>>> [ 1794.432735] *pde = 7eeb3067
>>> [ 1794.432743] Oops: 0000 [#1] SMP
>>> [ 1794.432751] last sysfs file: /sys/devices/system/cpu/cpu1/topology/core_id
>>> [ 1794.432759] Modules linked in: agrserial agrmodem snd_hda_codec
>>> snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss
>>> snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer
>>> snd_seq_device snd soundcore snd_page_alloc wlan_ccmp binfmt_misc
>>> ppdev vboxnetflt vboxnetadp vboxdrv isofs udf crc_itu_t joydev
>>> iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4
>>> iptable_mangle wlan_scan_sta ath_rate_sample iptable_filter ip_tables
>>> x_tables uvcvideo videodev v4l1_compat pcmcia psmouse serio_raw
>>> sdhci_pci sdhci led_class yenta_socket rsrc_nonstatic pcmcia_core
>>> ath_pci wlan ath_hal sbp2 lp parport dm_raid45 xor fbcon tileblit font
>>> bitblit softcursor i915 drm i2c_algo_bit ohci1394 ieee1394 r8169 mii
>>> intel_agp agpgart video output
>>> [ 1794.432918]
>>> [ 1794.432927] Pid: 25093, comm: wvdialconf Tainted: P
>>> (2.6.31-18-generic #55-Ubuntu) MSI Notebook VR601
>>> [ 1794.432935] EIP: 0060:[<fc97b88d>] EFLAGS: 00010296 CPU: 1
>>> [ 1794.432993] EIP is at HDAdump+0xd/0x80 [agrmodem]
>>> [ 1794.432999] EAX: 00000000 EBX: fca7f0c4 ECX: 00000000 EDX: 00000383
>>> [ 1794.433006] ESI: fca7f0c4 EDI: fca7f028 EBP: eda3dcf8 ESP: eda3dcd8
>>> [ 1794.433012]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
>>> [ 1794.433019] Process wvdialconf (pid: 25093, ti=eda3c000
>>> task=edb6bed0 task.ti=eda3c000)
>>> [ 1794.433024] Stack:
>>> [ 1794.433028]  fc8a500e fca7f0c4 eda3dd00 fc960380 eda3dcf4 eda3dd6f
>>> fca7f0c4 fca7f0c4
>>> [ 1794.433046] <0> eda3dd00 fc97b908 eda3dd20 fc966769 fca895e9
>>> fca895ea eda3dd20 c05718fc
>>> [ 1794.433064] <0> fc994dd3 eda3dd6f eda3dd90 fc94f9f1 fca7f0c4
>>> fc9f6048 00000008 00000001
>>> [ 1794.433084] Call Trace:
>>> [ 1794.433144]  [<fc8a500e>] ? x_do_gettimeofday+0xe/0x20 [agrmodem]
>>> [ 1794.433240]  [<fc960380>] ? lin_timer_ms+0x12/0x36 [agrmodem]
>>> [ 1794.433314]  [<fc97b908>] ? azlGetResourceInformation+0x8/0x20 [agrmodem]
>>> [ 1794.433391]  [<fc966769>] ? CAzlIntelInit+0x2d/0x3c4 [agrmodem]
>>> [ 1794.433417]  [<c05718fc>] ? printk+0x18/0x1c
>>> [ 1794.433504]  [<fc94f9f1>] ? LXHardwareStart+0x11de/0x13fb [agrmodem]
>>> [ 1794.433532]  [<c01b7ea5>] ? get_page_from_freelist+0x1c5/0x370
>>> [ 1794.433542]  [<c0573cba>] ? _spin_lock_irqsave+0x2a/0x40
>>> [ 1794.433629]  [<fc94b1a8>] ? linux_modem_open+0x45/0x10e [agrmodem]
>>> [ 1794.433651]  [<c0150bbb>] ? mod_timer+0xcb/0x140
>>> [ 1794.433710]  [<fc8a52a8>] ? wrap_linux_modem_open+0x8/0x10 [agrmodem]
>>> [ 1794.433768]  [<fc8a5308>] ? modemPortOpen+0x8/0x20 [agrmodem]
>>> [ 1794.433780]  [<fcb30fe0>] ? serial8250_startup+0x210/0x380 [agrserial]
>>> [ 1794.433791]  [<c039ceb6>] ? uart_startup+0x46/0x140
>>> [ 1794.433799]  [<c039d9f2>] ? uart_open+0x102/0x220
>>> [ 1794.433809]  [<c0384af3>] ? __tty_open+0x1a3/0x460
>>> [ 1794.433817]  [<c0384dcf>] ? tty_open+0x1f/0x40
>>> [ 1794.433828]  [<c01eabfd>] ? chrdev_open+0xcd/0x190
>>> [ 1794.433837]  [<c01e5bd9>] ? __dentry_open+0xb9/0x230
>>> [ 1794.433845]  [<c01e5e35>] ? nameidata_to_filp+0x55/0x70
>>> [ 1794.433855]  [<c01eab30>] ? chrdev_open+0x0/0x190
>>> [ 1794.433865]  [<c01f3b8a>] ? do_filp_open+0x53a/0x890
>>> [ 1794.433876]  [<c01e5970>] ? do_sys_open+0x50/0x150
>>> [ 1794.433885]  [<c01e9425>] ? fput+0x15/0x20
>>> [ 1794.433893]  [<c01e5847>] ? filp_close+0x47/0x70
>>> [ 1794.433902]  [<c01e5ad9>] ? sys_open+0x29/0x40
>>> [ 1794.433911]  [<c01033ac>] ? syscall_call+0x7/0xb
>>> [ 1794.433916] Code: 89 44 24 08 e8 79 60 bf c3 89 1d 4c e3 9c fc 8b
>>> 43 04 83 e0 0f eb c4 8d b4 26 00 00 00 00 55 89 e5 56 53 83 ec 18 a1
>>> e0 d0 50 fc <8b> 98 68 01 00 00 8b 43 28 c7 04 24 1b 6a 99 fc 89 44 24
>>> 04 e8
>>> [ 1794.434026] EIP: [<fc97b88d>] HDAdump+0xd/0x80 [agrmodem] SS:ESP
>>> 0068:eda3dcd8
>>> [ 1794.434089] CR2: 0000000000000168
>>> [ 1794.434153] ---[ end trace d4263b1fcdf89f3c ]---
>>>
>>>
>>> I will try to install ALSA from the official site.
>>> Thanks!
>>> Kevin
>>>
>>> 2010/2/2 Marvin Stodolsky <marvin.stodolsky@xxxxxxxxx>:
>>>> Kevin,
>>>>
>>>> Prepare for Bjorn's suggested edit by:
>>>> $ dkms status
>>>> whose output on my System includes:
>>>> agrsm-11c11040, 2.1.80, 2.6.31-17-generic, i686: installed
>>>> Then do:
>>>> $ sudo dkms remove -m agrsm-11c11040 -v 2.1.80 --all
>>>> This cleans a copy of the code package from the /var/lib/dkms/ folders,
>>>> wherein DKMS does the actual compiles
>>>>
>>>> Next to Bjorn's edit.
>>>>  Then reinstall with
>>>> $ sudo ./dodkms
>>>>
>>>> MarvS
>>>>
>>>> MarvS
>>>>
>>>>
>>>> On Tue, Feb 2, 2010 at 6:46 AM, Bjorn Wielens <Uniacke1@xxxxxxxx> wrote:
>>>>> Hmm... Your system is an MSI laptop too :)
>>>>> Anyway, looks like it's hanging trying to locate the modem's HDA codec.
>>>>>
>>>>> Can you edit the HDA.c file in the source and uncomment the line
>>>>> #define HDAdbg (located just before the code starts, after comments.)
>>>>> Then recompile the drivers (Not sure how to do this with DKMS- I"ve
>>>>> always used Makefiles, but I think it is along the lines of sudo
>>>>> dpkg-reconfigure <package name>)
>>>>>
>>>>> This will likely provide more kernel output in your syslog, which should
>>>>> provide extra info on the cause of the crash.
>>>>>
>>>>> Another thing worth trying is doing a "stock" driver install of the
>>>>> alsa-drivers-1.0.20 package from alsa-project.org. Sometimes distros may
>>>>> apply patches to the source which adversely affect driver function.
>>>>> The problem with the agrsm drivers is that they are VERY specific. :(
>>>>>
>>>>> Best,
>>>>> Bjorn.
>>>>>
>>>>>
>>>>> On 02/02/2010 12:55 AM, Kevin Fernandez wrote:
>>>>>> Hello Bjorn,
>>>>>> I have ALSA 1.0.20, the package i've used right now is
>>>>>> agrsm-11c11040-2.1.80~20091225.tar.bz2
>>>>>> I've used dodkms and a kernel i didn't use before (2.6.31-16-generic).
>>>>>> I've booted into that kernel, ran twice Marv's unloading script (if i
>>>>>> run it twice it unloads more):
>>>>>>
>>>>>> MODULES_FINAL=isofs binfmt_misc joydev psmouse fbcon tileblit font
>>>>>> bitblit softcursor i915 drm i2c_algo_bit intel_agp agpgart video
>>>>>> output
>>>>>>
>>>>>> then loaded agrmodem and agrserial:
>>>>>> [  112.493879] * Hello Agere Driver **
>>>>>> [  112.493950] usbcore: registered new interface driver agr12dec2006
>>>>>> [  112.970170]   alloc irq_desc for 20 on node -1
>>>>>> [  112.970174]   alloc kstat_irqs on node -1
>>>>>> [  112.970182] pci 0000:00:1b.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20
>>>>>> [  115.917518] Loading module Agere Modem Controller driver version
>>>>>> 2.1.80 (2007-10-01)
>>>>>> [  115.917525] Disabling lock debugging due to kernel taint
>>>>>> [  123.858338] serial8250_register_ports: BaseAddress 0x8004 Irq 20
>>>>>> [  123.858350] ttyAGS3 at I/O 0x8004 (irq = 20) is a AgereModem
>>>>>> [  123.858455] agrserial - ret_val 0, call: lt_modem_ops.init_modem
>>>>>> [  123.858463] Loading module Agere Modem Interface driver version
>>>>>> 2.1.80.0 (2007-10-01)
>>>>>>
>>>>>> (is this rev_val 0 line normal?)
>>>>>> Made a symlink /dev/modem to /dev/ttyAGS3 and /dev/ttySAGS to
>>>>>> /dev/ttyAGS3 (i think i read somewhere to do this for wvdialconf to
>>>>>> find the modem).
>>>>>>
>>>>>> Ran sudo wvdialconf /etc/wvdial.conf (instead of wvdial this time) and got this:
>>>>>>
>>>>>> [  181.005484] ==> codecType = 0x32
>>>>>> [  181.005512] BUG: unable to handle kernel NULL pointer dereference at 00000168
>>>>>> [  181.005523] IP: [<f8f68818>] azlGetResourceInformation+0x8/0x60 [agrmodem]
>>>>>> [  181.005592] *pde = 7f322067
>>>>>> [  181.005599] Oops: 0000 [#1] SMP
>>>>>> [  181.005607] last sysfs file: /sys/devices/system/cpu/cpu1/topology/core_id
>>>>>> [  181.005614] Modules linked in: agrserial agrmodem snd_hda_codec
>>>>>> snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss
>>>>>> snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer
>>>>>> snd_seq_device snd soundcore snd_page_alloc isofs binfmt_misc joydev
>>>>>> psmouse fbcon tileblit font bitblit softcursor i915 drm i2c_algo_bit
>>>>>> intel_agp agpgart video output [last unloaded: wlan]
>>>>>> [  181.005692]
>>>>>> [  181.005701] Pid: 5655, comm: wvdialconf Tainted: P
>>>>>> (2.6.31-16-generic #53-Ubuntu) MSI Notebook VR601
>>>>>> [  181.005708] EIP: 0060:[<f8f68818>] EFLAGS: 00010286 CPU: 0
>>>>>> [  181.005766] EIP is at azlGetResourceInformation+0x8/0x60 [agrmodem]
>>>>>> [  181.005773] EAX: 00000000 EBX: f86af0c4 ECX: 00000000 EDX: 0000020b
>>>>>> [  181.005779] ESI: f86af0c4 EDI: f86af028 EBP: f02efd00 ESP: f02efd00
>>>>>> [  181.005785]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
>>>>>> [  181.005792] Process wvdialconf (pid: 5655, ti=f02ee000
>>>>>> task=f02a3240 task.ti=f02ee000)
>>>>>> [  181.005797] Stack:
>>>>>> [  181.005801]  f02efd20 f8f53769 f86b95e9 f86b95ea f02efd20 c056ea7c
>>>>>> f8f81c93 f02efd6f
>>>>>> [  181.005818] <0> f02efd90 f8f3c9f1 f86af0c4 f8521048 00000008
>>>>>> 00000001 f86af39c 00000004
>>>>>> [  181.005837] <0> c162c2a0 00000000 c0784e40 00000000 c01b7e2d
>>>>>> 00000001 00000041 ffffffff
>>>>>> [  181.005857] Call Trace:
>>>>>> [  181.005934]  [<f8f53769>] ? CAzlIntelInit+0x2d/0x3c4 [agrmodem]
>>>>>> [  181.005952]  [<c056ea7c>] ? printk+0x18/0x1c
>>>>>> [  181.006038]  [<f8f3c9f1>] ? LXHardwareStart+0x11de/0x13fb [agrmodem]
>>>>>> [  181.006057]  [<c01b7e2d>] ? get_page_from_freelist+0x1bd/0x360
>>>>>> [  181.006066]  [<c0570e3a>] ? _spin_lock_irqsave+0x2a/0x40
>>>>>> [  181.006153]  [<f8f381a8>] ? linux_modem_open+0x45/0x10e [agrmodem]
>>>>>> [  181.006167]  [<c0150c2b>] ? mod_timer+0xcb/0x140
>>>>>> [  181.006226]  [<f8e922a8>] ? wrap_linux_modem_open+0x8/0x10 [agrmodem]
>>>>>> [  181.006284]  [<f8e92308>] ? modemPortOpen+0x8/0x20 [agrmodem]
>>>>>> [  181.006296]  [<f857cfe0>] ? serial8250_startup+0x210/0x380 [agrserial]
>>>>>> [  181.006308]  [<c0399376>] ? uart_startup+0x46/0x140
>>>>>> [  181.006317]  [<c0399eb2>] ? uart_open+0x102/0x220
>>>>>> [  181.006326]  [<c0380f53>] ? __tty_open+0x1a3/0x460
>>>>>> [  181.006335]  [<c038122f>] ? tty_open+0x1f/0x40
>>>>>> [  181.006344]  [<c01eaa5d>] ? chrdev_open+0xcd/0x190
>>>>>> [  181.006353]  [<c01e5a39>] ? __dentry_open+0xb9/0x230
>>>>>> [  181.006361]  [<c01e5c95>] ? nameidata_to_filp+0x55/0x70
>>>>>> [  181.006370]  [<c01ea990>] ? chrdev_open+0x0/0x190
>>>>>> [  181.006379]  [<c01f39ea>] ? do_filp_open+0x53a/0x890
>>>>>> [  181.006389]  [<c01e57d0>] ? do_sys_open+0x50/0x150
>>>>>> [  181.006397]  [<c01e9285>] ? fput+0x15/0x20
>>>>>> [  181.006405]  [<c01e56a7>] ? filp_close+0x47/0x70
>>>>>> [  181.006412]  [<c01e5939>] ? sys_open+0x29/0x40
>>>>>> [  181.006421]  [<c010336c>] ? syscall_call+0x7/0xb
>>>>>> [  181.006426] Code: 10 75 e8 b8 fd ff ff ff 5d c3 90 31 c0 5d c3 8d
>>>>>> 74 26 00 89 15 ac b0 fb f8 8b 42 04 5d 83 e0 0f c3 66 90 a1 e0 50 63
>>>>>> fd 55 89 e5 <8b> 80 68 01 00 00 8b 48 74 31 c0 90 8d 74 26 00 8b 54 81
>>>>>> 34 85
>>>>>> [  181.006535] EIP: [<f8f68818>] azlGetResourceInformation+0x8/0x60
>>>>>> [agrmodem] SS:ESP 0068:f02efd00
>>>>>> [  181.006598] CR2: 0000000000000168
>>>>>> [  181.006606] ---[ end trace c5d7e7cd560c2388 ]---
>>>>>>
>>>>>>
>>>>>> After this i tried to boot in rescue mode (only with terminal) to have
>>>>>> even less modules loaded, ran unloading twice, tried wvdial, same..
>>>>>> Everytime i have this, the device is busy after and i have to reboot.
>>>>>>
>>>>>> Thanks for your time!
>>>>>> Kevin
>>>>>>
>>>>>> 2010/2/1 Bjorn Wielens <Uniacke1@xxxxxxxx>:
>>>>>>> Marv, Kevin:
>>>>>>> Just a heads up- These crashes/segfaults almost ALWAYS caused by a
>>>>>>> mismatch between the agrsm driver version and the ALSA version on your
>>>>>>> computer.
>>>>>>>
>>>>>>> Which driver package are you using, and what is the output of
>>>>>>> 'cat /proc/asound/version'?
>>>>>>>
>>>>>>> The ALSA version for my most recently prepared tarball and its
>>>>>>> derivatives is 1.0.20. Any newer is not yet supported.
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Bjorn.
>>>>>>>
>>>>>>>
>>>>>>> On 02/01/2010 08:37 PM, Marvin Stodolsky wrote:
>>>>>>>> Kevin,
>>>>>>>>
>>>>>>>> You are using the correct drivers.
>>>>>>>> Try detaching external devices as much as possible before bootup, and
>>>>>>>> shutting down non-essential programs  before using the modem.  You
>>>>>>>> could check whether the problems begin during a simple activation
>>>>>>>> with:
>>>>>>>> $ sudo wvdialconf  wvtest
>>>>>>>> or only during an actual dialout.
>>>>>>>>
>>>>>>>> I'll also send you an "unloading" script, which tries to unload
>>>>>>>> non-essential modules.
>>>>>>>> Also try using it before modem usage as:
>>>>>>>> $ sudo ./unloading
>>>>>>>>
>>>>>>>> Sadly we don't have debugging capability for these drivers, because
>>>>>>>> there is a closed source component.
>>>>>>>>
>>>>>>>> MarvS
>>>>>>>>
>>>>>>>> On Mon, Feb 1, 2010 at 11:59 AM, Kevin Fernandez <siegfri3d@xxxxxxxxx> wrote:
>>>>>>>>> Sorry this was an old modemdata, i removed slmodem a long time ago.. I
>>>>>>>>> attached a new modemdata.txt.
>>>>>>>>> On windows it says:
>>>>>>>>> Agere Systems HDA modem
>>>>>>>>> Slot 1 (internal High Definition Audio bus)
>>>>>>>>>
>>>>>>>>> device ID HDAUDIO\FUNC_02&VEN_11C1&DEV_1040&SUBSYS_11C10001&REV_1002
>>>>>>>>>
>>>>>>>>> Thanks for the help!
>>>>>>>>> Kevin
>>>>>>>>>
>>>>>>>>> 2010/2/1 Marvin Stodolsky <marvin.stodolsky@xxxxxxxxx>:
>>>>>>>>>> Kevin,
>>>>>>>>>>
>>>>>>>>>> Under install the hsfmodem software.  It is for Conexant modem chips
>>>>>>>>>> and may be interferring.
>>>>>>>>>> Then rerun scanModem
>>>>>>>>>> As described in SoftModem.txt, please get diagnostic info under Microsoft too.
>>>>>>>>>>
>>>>>>>>>> MarvS
>>>>>>>>>> scanModem maintainer
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Mon, Feb 1, 2010 at 12:57 AM, Kevin Fernandez <siegfri3d@xxxxxxxxx> wrote:
>>>>>>>>>>> Hello there,
>>>>>>>>>>> I'm trying to get my modem working for some days, still no luck.
>>>>>>>>>>> I've attached the modemdata.
>>>>>>>>>>> I compile the driver (agrsm-11c11040-2.1.80~20091225), i install it
>>>>>>>>>>> and load the modules, then i get:
>>>>>>>>>>> [  677.293574] * Hello Agere Driver **
>>>>>>>>>>> [  677.293623] usbcore: registered new interface driver agr12dec2006
>>>>>>>>>>> [  680.664348] Loading module Agere Modem Controller driver version
>>>>>>>>>>> 2.1.80 (2007-10-01)
>>>>>>>>>>> [  680.664354] Disabling lock debugging due to kernel taint
>>>>>>>>>>> [  683.898153] serial8250_register_ports: BaseAddress 0x8004 Irq 20
>>>>>>>>>>> [  683.898160] ttyAGS3 at I/O 0x8004 (irq = 20) is a AgereModem
>>>>>>>>>>> [  683.898229] agrserial - ret_val 0, call: lt_modem_ops.init_modem
>>>>>>>>>>> [  683.898234] Loading module Agere Modem Interface driver version
>>>>>>>>>>> 2.1.80.0 (2007-10-01)
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> then i fire up wvdial to use the device and i get nothing, but i have
>>>>>>>>>>> this in dmesg:
>>>>>>>>>>>
>>>>>>>>>>> [  694.818705] ==> codecType = 0x32
>>>>>>>>>>> [  694.848151] BUG: unable to handle kernel NULL pointer dereference at 00000060
>>>>>>>>>>> [  694.848167] IP: [<f986a498>] ResumeCallBack+0x18/0x34 [agrmodem]
>>>>>>>>>>> [  694.848264] *pde = 7e584067
>>>>>>>>>>> [  694.848271] Oops: 0000 [#1] SMP
>>>>>>>>>>> [  694.848280] last sysfs file: /sys/devices/system/cpu/cpu1/topology/core_id
>>>>>>>>>>> [  694.848287] Modules linked in: agrserial agrmodem isofs udf
>>>>>>>>>>> crc_itu_t binfmt_misc ppdev vboxnetflt vboxnetadp vboxdrv joydev
>>>>>>>>>>> snd_hda_codec_realtek wlan_scan_sta ath_rate_sample snd_hda_intel
>>>>>>>>>>> pcmcia snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm
>>>>>>>>>>> snd_seq_dummy uvcvideo videodev v4l1_compat sdhci_pci sdhci led_class
>>>>>>>>>>> yenta_socket rsrc_nonstatic pcmcia_core psmouse serio_raw iptable_nat
>>>>>>>>>>> nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 iptable_mangle
>>>>>>>>>>> iptable_filter ip_tables x_tables ath_pci wlan ath_hal snd_seq_oss
>>>>>>>>>>> snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer
>>>>>>>>>>> snd_seq_device snd soundcore snd_page_alloc sbp2 lp parport dm_raid45
>>>>>>>>>>> xor fbcon tileblit font bitblit softcursor i915 drm i2c_algo_bit
>>>>>>>>>>> ohci1394 ieee1394 r8169 mii intel_agp video agpgart output
>>>>>>>>>>> [  694.848449]
>>>>>>>>>>> [  694.848457] Pid: 7339, comm: wvdial Tainted: P
>>>>>>>>>>> (2.6.31-18-generic #55-Ubuntu) MSI Notebook VR601
>>>>>>>>>>> [  694.848465] EIP: 0060:[<f986a498>] EFLAGS: 00010282 CPU: 0
>>>>>>>>>>> [  694.848550] EIP is at ResumeCallBack+0x18/0x34 [agrmodem]
>>>>>>>>>>> [  694.848557] EAX: f02c0800 EBX: 00000000 ECX: 01828000 EDX: f986a480
>>>>>>>>>>> [  694.848563] ESI: e650dc9c EDI: f02c0800 EBP: e650dc58 ESP: e650dc40
>>>>>>>>>>> [  694.848569]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
>>>>>>>>>>> [  694.848577] Process wvdial (pid: 7339, ti=e650c000 task=e6e9e480
>>>>>>>>>>> task.ti=e650c000)
>>>>>>>>>>> [  694.848582] Stack:
>>>>>>>>>>> [  694.848586]  00000000 00000003 0002a22c f02c0800 e650dc9c f02c0800
>>>>>>>>>>> e650dc64 f8bdeca2
>>>>>>>>>>> [  694.848604] <0> f02c0800 e650dc70 f8bdcd84 efcfa200 e650dc94
>>>>>>>>>>> f8bdce20 100f0000 0100cc9f
>>>>>>>>>>> [  694.848622] <0> e650dc9c efcfa274 000f0000 e650dc9c f9947028
>>>>>>>>>>> e650dca8 f8bdde41 ffffffff
>>>>>>>>>>> [  694.848643] Call Trace:
>>>>>>>>>>> [  694.848668]  [<f8bdeca2>] ? hda_call_codec_resume+0x42/0x70 [snd_hda_codec]
>>>>>>>>>>> [  694.848691]  [<f8bdcd84>] ? snd_hda_power_up+0x34/0x60 [snd_hda_codec]
>>>>>>>>>>> [  694.848711]  [<f8bdce20>] ? codec_exec_verb+0x70/0xc0 [snd_hda_codec]
>>>>>>>>>>> [  694.848741]  [<f8bdde41>] ? snd_hda_codec_read+0x31/0x40 [snd_hda_codec]
>>>>>>>>>>> [  694.848801]  [<f989a999>] ? LnxTransferCodecVerbs+0x49/0x60 [agrmodem]
>>>>>>>>>>> [  694.848890]  [<f9884b1b>] ? VerbTransfer+0x2f/0x3c [agrmodem]
>>>>>>>>>>> [  694.848976]  [<f9884b73>] ? GetAzCodecID+0x4b/0x63 [agrmodem]
>>>>>>>>>>> [  694.849063]  [<f9885788>] ? CAzlIntelInit+0x4c/0x3c4 [agrmodem]
>>>>>>>>>>> [  694.849085]  [<c05718fc>] ? printk+0x18/0x1c
>>>>>>>>>>> [  694.849173]  [<f986e9f1>] ? LXHardwareStart+0x11de/0x13fb [agrmodem]
>>>>>>>>>>> [  694.849199]  [<c01b7ea5>] ? get_page_from_freelist+0x1c5/0x370
>>>>>>>>>>> [  694.849209]  [<c0573cba>] ? _spin_lock_irqsave+0x2a/0x40
>>>>>>>>>>> [  694.849295]  [<f986a1a8>] ? linux_modem_open+0x45/0x10e [agrmodem]
>>>>>>>>>>> [  694.849316]  [<c0150bbb>] ? mod_timer+0xcb/0x140
>>>>>>>>>>> [  694.849376]  [<f97c42a8>] ? wrap_linux_modem_open+0x8/0x10 [agrmodem]
>>>>>>>>>>> [  694.849435]  [<f97c4308>] ? modemPortOpen+0x8/0x20 [agrmodem]
>>>>>>>>>>> [  694.849447]  [<f818cfe0>] ? serial8250_startup+0x210/0x380 [agrserial]
>>>>>>>>>>> [  694.849457]  [<c039ceb6>] ? uart_startup+0x46/0x140
>>>>>>>>>>> [  694.849465]  [<c039d9f2>] ? uart_open+0x102/0x220
>>>>>>>>>>> [  694.849475]  [<c0384af3>] ? __tty_open+0x1a3/0x460
>>>>>>>>>>> [  694.849483]  [<c0384dcf>] ? tty_open+0x1f/0x40
>>>>>>>>>>> [  694.849493]  [<c01eabfd>] ? chrdev_open+0xcd/0x190
>>>>>>>>>>> [  694.849502]  [<c01e5bd9>] ? __dentry_open+0xb9/0x230
>>>>>>>>>>> [  694.849511]  [<c01e5e35>] ? nameidata_to_filp+0x55/0x70
>>>>>>>>>>> [  694.849520]  [<c01eab30>] ? chrdev_open+0x0/0x190
>>>>>>>>>>> [  694.849530]  [<c01f3b8a>] ? do_filp_open+0x53a/0x890
>>>>>>>>>>> [  694.849540]  [<c01e5970>] ? do_sys_open+0x50/0x150
>>>>>>>>>>> [  694.849548]  [<c01e9425>] ? fput+0x15/0x20
>>>>>>>>>>> [  694.849556]  [<c01e5847>] ? filp_close+0x47/0x70
>>>>>>>>>>> [  694.849564]  [<c01e5ad9>] ? sys_open+0x29/0x40
>>>>>>>>>>> [  694.849573]  [<c01033ac>] ? syscall_call+0x7/0xb
>>>>>>>>>>> [  694.849578] Code: 89 d8 83 c4 2c 5b 5e 5f 5d c3 90 90 90 90 90 90
>>>>>>>>>>> 90 90 90 55 89 e5 53 83 ec 14 8b 1d e8 e3 8e f9 c7 44 24 04 03 00 00
>>>>>>>>>>> 00 89 1c 24 <ff> 53 60 c7 44 24 04 00 00 00 00 89 1c 24 ff 53 60 b8 00
>>>>>>>>>>> 00 00
>>>>>>>>>>> [  694.849687] EIP: [<f986a498>] ResumeCallBack+0x18/0x34 [agrmodem]
>>>>>>>>>>> SS:ESP 0068:e650dc40
>>>>>>>>>>> [  694.849777] CR2: 0000000000000060
>>>>>>>>>>> [  694.849784] ---[ end trace e662cdc749dd82f6 ]---
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> As you can see i'm running ubuntu karmic, kernel 2.6.31-18-generic .
>>>>>>>>>>> Sometimes wvdial even freezes my computer.
>>>>>>>>>>> Any help is appreciated!
>>>>>>>>>>> Thanks
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>
>>
>>
> 

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