Re: NULL pointer dereference

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Kevin,

 What does the following command say:
 $ grep CONFIG_SND_HDA_POWER_SAVE /boot/config-`uname -r`

 Also, did you try to rebuild the driver under the new kernel?
 I think portions of the driver depend on the
 CONFIG_SND_HDA_POWER_SAVE option too. So the driver needs to
 be rebuilt.

cd <where the sources are>
make clean
make
sudo make modules_install
sudo modprobe agrmodem
sudo modprobe agrserial
sudo ln -sf /dev/ttyAGS3 /dev/modem
sudo ln -sf /dev/ttyAGS3 /dev/ttySAGR
sudo wvdialconf /etc/wvdial.conf

-- 
Nick Zhuravlev
www.auriga.com

On Wed, Feb 17, 2010 at 02:24:31AM -0200, Kevin Fernandez <siegfri3d@xxxxxxxxx> wrote:

> Hello Nikolay,
> First thanks for helping!
> 
> I tried to recompile the kernel (2.6.31 of the ubuntu sources), i
> disabled the SMP support, CONFIG_SND_HDA_POWER_SAVE was already unset
> so i tried to set it as 0, using the new kernel i brought done all
> interfaces, unloaded many modules, connected successfully, i could
> ping and send 10 icmp packets but then the network stopped again and
> pppd crashed (just like before), when reconnecting it gave me a
> segfault (so again, just like before), the dmesg output is a bit
> different:
> 
> [  539.463626] ------------[ cut here ]------------
> [  539.463629] kernel BUG at kernel/timer.c:762!
> [  539.463631] invalid opcode: 0000 [#1]
> [  539.463634] last sysfs file:
> /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:0b/PNP0C09:00/PNP0C0A:00/power_supply/BAT1/voltage_now
> [  539.463638] Modules linked in: ppp_async crc_ccitt agrserial
> agrmodem isofs binfmt_misc snd_hda_codec_realtek snd_hda_intel
> snd_hda_codec snd_hwdep snd_pcm snd_timer snd psmouse soundcore
> snd_page_alloc fbcon tileblit font bitblit softcursor i915 drm
> i2c_algo_bit intel_agp agpgart video output [last unloaded: mii]
> [  539.463658]
> [  539.463662] Pid: 9361, comm: wvdial Tainted: P           (2.6.31.9
> #3) MSI Notebook VR601
> [  539.463665] EIP: 0060:[<c013be43>] EFLAGS: 00210286 CPU: 0
> [  539.463673] EIP is at add_timer+0x13/0x20
> [  539.463675] EAX: fb576ae0 EBX: f97bed7c ECX: 00000000 EDX: f97beac0
> [  539.463678] ESI: f97bed7c EDI: fffffff4 EBP: efb41d88 ESP: efb41d88
> [  539.463680]  DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
> [  539.463684] Process wvdial (pid: 9361, ti=efb40000 task=efb38c80
> task.ti=efb40000)
> [  539.463686] Stack:
> [  539.463687]  efb41d90 fb44e04e efb41da0 fb508e7c fb508e37 f97bed7c
> efb41dc0 fb508f05
> [  539.463693] <0> 000003e8 00000000 00000000 00000000 12345678
> f97bed7c efb41dc8 fb44e2b8
> [  539.463698] <0> efb41dd0 fb44e2cd efb41de8 f97bcf60 fffffff4
> efb41de8 f1bd61a4 f97bed7c
> [  539.463704] Call Trace:
> [  539.463739]  [<fb44e04e>] ? lt_add_timer+0x2e/0x30 [agrmodem]
> [  539.463782]  [<fb508e7c>] ? VMODEM_Start_Timer+0x28/0x33 [agrmodem]
> [  539.463822]  [<fb508e37>] ? timertick_function+0x0/0x1d [agrmodem]
> [  539.463863]  [<fb508f05>] ? vxdPortOpen+0x3b/0x42 [agrmodem]
> [  539.463893]  [<fb44e2b8>] ? wrap_vxdPortOpen+0x8/0x10 [agrmodem]
> [  539.463921]  [<fb44e2cd>] ? modemPortOpen+0xd/0x20 [agrmodem]
> [  539.463927]  [<f97bcf60>] ? serial8250_startup+0x1b0/0x370 [agrserial]
> [  539.463933]  [<c0363792>] ? uart_startup+0x42/0x130
> [  539.463937]  [<c0363d68>] ? uart_open+0xd8/0x340
> [  539.463941]  [<c034bbb6>] ? tty_init_dev+0x76/0x140
> [  539.463946]  [<c01d8a06>] ? mntput_no_expire+0x16/0x80
> [  539.463949]  [<c034be1f>] ? tty_open+0x19f/0x430
> [  539.463953]  [<c01c6f7a>] ? chrdev_open+0x8a/0x120
> [  539.463958]  [<c01c241a>] ? __dentry_open+0xaa/0x220
> [  539.463962]  [<c01c2675>] ? nameidata_to_filp+0x55/0x70
> [  539.463965]  [<c01c6ef0>] ? chrdev_open+0x0/0x120
> [  539.463969]  [<c01cf7e5>] ? do_filp_open+0x535/0x8f0
> [  539.463973]  [<c01cc465>] ? getname+0x25/0xf0
> [  539.463977]  [<c01c21b0>] ? do_sys_open+0x50/0x160
> [  539.463981]  [<c01c5a45>] ? fput+0x15/0x20
> [  539.463984]  [<c01c2329>] ? sys_open+0x29/0x40
> [  539.463988]  [<c010332c>] ? syscall_call+0x7/0xb
> [  539.463990] Code: 40 2b 6e c0 8b 80 08 02 00 00 89 41 2c e9 36 ff
> ff ff 8d b6 00 00 00 00 55 8b 10 89 e5 85 d2 75 0a 8b 50 08 e8 ef fe
> ff ff 5d c3 <0f> 0b eb fe 89 f6 8d bc 27 00 00 00 00 55 89 e5 e8 18 97
> ff ff
> [  539.464019] EIP: [<c013be43>] add_timer+0x13/0x20 SS:ESP 0068:efb41d88
> [  539.464060] ---[ end trace c38ee2fc1c238c35 ]---
> 
> I'll try to see if i can get some logs of pppd when it crashes.
> 
> Any idea would be appreciated!
> Thanks,
> Kevin
> 
> 2010/2/16, Nikolay Zhuravlev <xxor@xxxxxxx>:
> > Things to try that come to my mind:
> >
> > - try a non-SMP kernel
> > - try to build the kernel with the
> >   CONFIG_SND_HDA_POWER_SAVE unset
> > - try to bring down other interfaces (eth0, wlan0)
> >   before using the modem
> >
> > --
> > Nick Zhuravlev
> > www.auriga.com
> >
> > On Sun, Feb 14, 2010 at 08:51:02PM -0200, Kevin Fernandez
> > <siegfri3d@xxxxxxxxx> wrote:
> >
> >> Almost there!
> >> I don't know if it's your change (probably!); as i also upgraded to
> >> the variant 2.6.31-20-generic.
> >> I could run wvdialconf without problem, then i tried multiple times to
> >> connect but right after connecting to the first site it was always
> >> crashing wvdial/pppd (i could see that it resolved the site in firefox
> >> and was trying to connect to it).
> >> After trying another time i got a segmentation fault:
> >>
> >> --> WvDial: Internet dialer version 1.60
> >> --> Initializing modem.
> >> --> Sending: ATZ
> >> ATZ
> >> OK
> >> --> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
> >> ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
> >> OK
> >> --> Modem initialized.
> >> --> Sending: ATDT17003131
> >> --> Waiting for carrier.
> >> ATDT17003131
> >> BUSY
> >> --> The line is busy. Trying again.
> >> --> Sending: ATDT17003131
> >> --> Waiting for carrier.
> >> ATDT17003131
> >> CONNECT 40000 V44
> >> --> Carrier detected.  Waiting for prompt.
> >> ~[7f]}#@!}!}!} }8}"}&} }*} } }#}$@#}%}&(BAh}'}"}(}"[0c]J~
> >> --> PPP negotiation detected.
> >> --> Starting pppd at Sun Feb 14 20:17:40 2010
> >> --> Pid of pppd: 16639
> >> --> Using interface ppp0
> >> --> pppd: px2[08]@[7f]2[08]
> >> --> pppd: px2[08]@[7f]2[08]
> >> --> pppd: px2[08]@[7f]2[08]
> >> --> pppd: px2[08]@[7f]2[08]
> >> --> local  IP address 189.48.97.120
> >> --> pppd: px2[08]@[7f]2[08]
> >> --> remote IP address 201.4.82.93
> >> --> pppd: px2[08]@[7f]2[08]
> >> --> primary   DNS address 200.202.193.75
> >> --> pppd: px2[08]@[7f]2[08]
> >> --> secondary DNS address 200.222.0.34
> >> --> pppd: px2[08]@[7f]2[08]
> >> --> pppd: px2[08]@[7f]2[08]
> >> --> Connect time 1.1 minutes.
> >> --> pppd: px2[08]@[7f]2[08]
> >> --> pppd: px2[08]@[7f]2[08]
> >> --> pppd: px2[08]@[7f]2[08]
> >> --> Disconnecting at Sun Feb 14 20:18:47 2010
> >> --> The PPP daemon has died: A modem hung up the phone (exit code = 16)
> >> --> man pppd explains pppd error codes in more detail.
> >> --> Try again and look into /var/log/messages and the wvdial and pppd
> >> man pages for more information.
> >> --> Auto Reconnect will be attempted in 5 seconds
> >> --> Initializing modem.
> >> --> Sending: ATZ
> >> ATZ
> >> OK
> >> --> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
> >> ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
> >> OK
> >> --> Modem initialized.
> >> Erreur de segmentation
> >>
> >>
> >>
> >> dmesg:
> >>
> >> [ 1348.660145] ------------[ cut here ]------------
> >> [ 1348.660150] kernel BUG at
> >> /build/buildd/linux-2.6.31/kernel/timer.c:762!
> >> [ 1348.660154] invalid opcode: 0000 [#1] SMP
> >> [ 1348.660159] last sysfs file:
> >> /sys/devices/system/cpu/cpu1/topology/core_id
> >> [ 1348.660162] Modules linked in: ppp_deflate zlib_deflate bsd_comp
> >> ppp_async crc_ccitt agrserial agrmodem isofs udf crc_itu_t binfmt_misc
> >> ppdev vboxnetflt vboxnetadp vboxdrv joydev snd_hda_codec_realtek
> >> wlan_scan_sta ath_rate_sample iptable_nat nf_nat nf_conntrack_ipv4
> >> nf_conntrack nf_defrag_ipv4 iptable_mangle snd_hda_intel snd_hda_codec
> >> snd_hwdep iptable_filter pcmcia ip_tables x_tables snd_pcm_oss
> >> snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss sdhci_pci sdhci
> >> led_class yenta_socket rsrc_nonstatic pcmcia_core snd_seq_midi
> >> snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd
> >> ath_pci wlan ath_hal psmouse serio_raw 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 agpgart video
> >> output
> >> [ 1348.660246]
> >> [ 1348.660251] Pid: 16129, comm: wvdial Tainted: P
> >> (2.6.31-20-generic #57-Ubuntu) MSI Notebook VR601
> >> [ 1348.660255] EIP: 0060:[<c0150bb3>] EFLAGS: 00010286 CPU: 1
> >> [ 1348.660262] EIP is at add_timer+0x13/0x20
> >> [ 1348.660265] EAX: fbaaebc0 EBX: f851ae28 ECX: 00000000 EDX: f851ab60
> >> [ 1348.660268] ESI: f851ae28 EDI: fffffff4 EBP: ec82dd88 ESP: ec82dd88
> >> [ 1348.660272]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> >> [ 1348.660275] Process wvdial (pid: 16129, ti=ec82c000 task=ec838000
> >> task.ti=ec82c000)
> >> [ 1348.660278] Stack:
> >> [ 1348.660280]  ec82dd90 fb98604e ec82dda0 fba40ebc fba40e77 f851ae28
> >> ec82ddc0 fba40f45
> >> [ 1348.660289] <0> 000003e8 00000000 00000000 00000000 12345678
> >> f851ae28 ec82ddc8 fb9862f8
> >> [ 1348.660298] <0> ec82ddd0 fb98630d ec82dde8 f8518fe0 fffffff4
> >> ec82dde8 ef86be04 f851ae28
> >> [ 1348.660309] Call Trace:
> >> [ 1348.660346]  [<fb98604e>] ? lt_add_timer+0x2e/0x30 [agrmodem]
> >> [ 1348.660389]  [<fba40ebc>] ? VMODEM_Start_Timer+0x28/0x33 [agrmodem]
> >> [ 1348.660432]  [<fba40e77>] ? timertick_function+0x0/0x1d [agrmodem]
> >> [ 1348.660473]  [<fba40f45>] ? vxdPortOpen+0x3b/0x42 [agrmodem]
> >> [ 1348.660504]  [<fb9862f8>] ? wrap_vxdPortOpen+0x8/0x10 [agrmodem]
> >> [ 1348.660533]  [<fb98630d>] ? modemPortOpen+0xd/0x20 [agrmodem]
> >> [ 1348.660540]  [<f8518fe0>] ? serial8250_startup+0x210/0x380 [agrserial]
> >> [ 1348.660548]  [<c039d0d6>] ? uart_startup+0x46/0x140
> >> [ 1348.660552]  [<c039dc12>] ? uart_open+0x102/0x220
> >> [ 1348.660557]  [<c0384d13>] ? __tty_open+0x1a3/0x460
> >> [ 1348.660562]  [<c0384fef>] ? tty_open+0x1f/0x40
> >> [ 1348.660568]  [<c01eae1d>] ? chrdev_open+0xcd/0x190
> >> [ 1348.660572]  [<c01e5df9>] ? __dentry_open+0xb9/0x230
> >> [ 1348.660577]  [<c01e6055>] ? nameidata_to_filp+0x55/0x70
> >> [ 1348.660581]  [<c01ead50>] ? chrdev_open+0x0/0x190
> >> [ 1348.660587]  [<c01f3daa>] ? do_filp_open+0x53a/0x890
> >> [ 1348.660592]  [<c01e5b90>] ? do_sys_open+0x50/0x150
> >> [ 1348.660597]  [<c01e9645>] ? fput+0x15/0x20
> >> [ 1348.660601]  [<c01e5a67>] ? filp_close+0x47/0x70
> >> [ 1348.660605]  [<c01e5cf9>] ? sys_open+0x29/0x40
> >> [ 1348.660610]  [<c01033ac>] ? syscall_call+0x7/0xb
> >> [ 1348.660612] Code: 8b 80 08 02 00 00 89 43 2c e9 fa fe ff ff 0f 0b
> >> eb fe 8d b6 00 00 00 00 55 8b 10 89 e5 85 d2 75 0a 8b 50 08 e8 af fe
> >> ff ff 5d c3 <0f> 0b eb fe 89 f6 8d bc 27 00 00 00 00 55 89 e5 e8 98 8c
> >> ff ff
> >> [ 1348.660669] EIP: [<c0150bb3>] add_timer+0x13/0x20 SS:ESP 0068:ec82dd88
> >> [ 1348.660677] ---[ end trace e3d2e7c757a613b0 ]---
> >>
> >>
> >> Any idea?
> >> Thanks for the help!
> >>
> >> 2010/2/14, Nikolay Zhuravlev <xxor@xxxxxxx>:
> >> > I am not sure. I think power_save=0 means that
> >> > there is no timeout and snd-hda-intel never sleeps.
> >> >
> >> > My previous kernel (vanilla 2.6.32) did not have
> >> > CONFIG_SND_HDA_POWER_SAVE set, so the power_save was
> >> > not even an option, and it all worked fine.
> >> >
> >> > There are also bug reports of some high pitch noise
> >> > related to the power_save=10 setting, both in Fedora
> >> > and in Ubuntu.
> >> >
> >> > --
> >> > Nick Zhuravlev
> >> > www.auriga.com
> >> >
> >> > On Sun, Feb 14, 2010 at 02:26:08PM -0400, Bjorn Wielens
> >> > <Uniacke1@xxxxxxxx>
> >> > wrote:
> >> >
> >> >> so it looks like if the hda driver is in a sleep state, the agrsm
> >> >> driver
> >> >> has a fit.
> >> >>
> >> >>
> >> >> I just verified that my SuSE distro does not set the power save in
> >> >> modprobe, hence it worked fine out of the box for me.
> >> >>
> >> >> That said, it must be possible to modify the driver code to "wake" the
> >> >> sound card properly- I know for a fact that it has function prototypes
> >> >> for powerup/powerdown functions.
> >> >>
> >> >> Bjorn.
> >> >>
> >> >>
> >> >> On 02/14/2010 01:57 PM, Nikolay Zhuravlev wrote:
> >> >> > Valera,
> >> >> >
> >> >> > Glad it worked for you.  It is amazing how much difference a single
> >> >> > bit of information can make ;)
> >> >> >
> >> >>
> >> >
> >> >
> >> >
> >

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