From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from sif.is.scarlet.be ([193.74.71.28]) by www.linuxtv.org with esmtp (Exim 4.63) (envelope-from ) id 1JRmuw-0001Wf-RL for linux-dvb@linuxtv.org; Wed, 20 Feb 2008 12:15:15 +0100 Received: from fry (ip-81-11-173-211.dsl.scarlet.be [81.11.173.211]) by sif.is.scarlet.be (8.14.2/8.14.2) with ESMTP id m1KBF93O022710 for ; Wed, 20 Feb 2008 12:15:10 +0100 From: "Ben Backx" To: References: In-Reply-To: Date: Wed, 20 Feb 2008 12:15:02 +0100 Message-ID: <003501c873b1$d72ff870$858fe950$@com> MIME-Version: 1.0 Content-Language: en-gb Subject: Re: [linux-dvb] Null pointer in dvb_device_open List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0360927627==" Mime-version: 1.0 Sender: linux-dvb-bounces@linuxtv.org Errors-To: linux-dvb-bounces+mchehab=infradead.org@linuxtv.org List-ID: This is a multipart message in MIME format. --===============0360927627== Content-Type: multipart/alternative; boundary="----=_NextPart_000_0036_01C873BA.38F46070" Content-Language: en-gb This is a multipart message in MIME format. ------=_NextPart_000_0036_01C873BA.38F46070 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sorry for the messed-up dmesg-output, hopefully this time it's better: [ 484.858908] BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 484.858917] printing eip: [ 484.858919] f8cd360a [ 484.858921] *pde = 00000000 [ 484.858924] Oops: 0000 [#1] [ 484.858925] SMP [ 484.858928] Modules linked in: dvb_driver dvb_core ipv6 af_packet rfcomm l2cap bluetooth ppdev cpufreq_ondemand cpufreq_stats cpufreq_powersave cpufreq_userspace freq_table cpufreq_conservative sbs button ac container dock video battery sbp2 lp snd_intel8x0 snd_ac97_codec ac97_bus 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 parport_pc parport pcspkr snd_page_alloc shpchp pci_hotplug i2c_nforce2 i2c_core nvidia_agp agpgart dv1394 evdev ext3 jbd mbcache sg sd_mod ide_cd cdrom usbhid hid amd74xx ide_core sata_sil ohci1394 ieee1394 ata_generic libata scsi_mod forcedeth ehci_hcd ohci_hcd usbcore thermal processor fan fuse apparmor commoncap [ 484.858978] CPU: 0 [ 484.858979] EIP: 0060:[] Not tainted VLI [ 484.858981] EFLAGS: 00010293 (2.6.22-14-generic #1) [ 484.858999] EIP is at dvb_device_open+0x3a/0x120 [dvb_core] [ 484.859002] eax: eafcfc04 ebx: 76697264 ecx: f8ce6600 edx: 00000003 [ 484.859006] esi: 00000000 edi: eafcfc0c ebp: eafcfc00 esp: ea123ec0 [ 484.859009] ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068 [ 484.859012] Process scan (pid: 5981, ti=ea122000 task=ea766f90 task.ti=ea122000) [ 484.859015] Stack: ec9ae960 eb2aa8d0 00000003 f8cd35d0 f8ce65a0 00000000 eb2aa8d0 c0183466 [ 484.859021] ec9ae960 00000003 ec9ae960 eb2aa8d0 00000000 c01833c0 c017ec48 dff5ac00 [ 484.859028] e9a2c440 ec9ae960 ffffff9c ea123f30 00000003 c017ee05 ec9ae960 00000000 [ 484.859034] Call Trace: [ 484.859038] [] dvb_device_open+0x0/0x120 [dvb_core] [ 484.859048] [] chrdev_open+0xa6/0x190 [ 484.859058] [] chrdev_open+0x0/0x190 [ 484.859062] [] __dentry_open+0xb8/0x1c0 [ 484.859073] [] nameidata_to_filp+0x35/0x40 [ 484.859079] [] do_filp_open+0x50/0x60 [ 484.859085] [] schedule+0x2ca/0x890 [ 484.859099] [] do_sys_open+0x4e/0xf0 [ 484.859105] [] sys_write+0x41/0x70 [ 484.859110] [] sys_open+0x1c/0x20 [ 484.859114] [] sysenter_past_esp+0x6b/0xa9 [ 484.859128] ======================= [ 484.859129] Code: 50 34 a1 6c 66 ce f8 81 e2 ff ff 0f 00 89 54 24 08 eb 02 89 d8 8b 18 0f 18 03 90 3d 6c 66 ce f8 74 35 8d 68 fc 8b 75 0c 8d 78 08 <8b> 0e 0f 18 01 90 39 fe 74 de 8b 46 14 8b 55 00 c1 e0 04 0b 46 [ 484.859154] EIP: [] dvb_device_open+0x3a/0x120 [dvb_core] SS:ESP 0068:ea123ec0 _____________________________________________ From: Ben Backx [mailto:ben@bbackx.com] Sent: 20 February 2008 12:07 To: 'linux-dvb@linuxtv.org' Subject: Null pointer in dvb_device_open Hi, I'm (still) developing a driver for a dvb-device, I'm making some progress, but I'm currently stuck at a null-pointer in dvb_device_open. The (relevant) dmesg-output: [ 484.858908] BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000[ 484.858917] printing eip:[ 484.858919] f8cd360a[ 484.858921] *pde = 00000000[ 484.858924] Oops: 0000 [#1][ 484.858925] SMP [ 484.858928] Modules linked in: dvb_driver dvb_core ipv6 af_packet rfcomm l2cap bluetooth ppdev cpufreq_ondemand cpufreq_stats cpufreq_powersave cpufreq_userspace freq_table cpufreq_conservative sbs button ac container dock video battery sbp2 lp snd_intel8x0 snd_ac97_codec ac97_bus 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 parport_pc parport pcspkr snd_page_alloc shpchp pci_hotplug i2c_nforce2 i2c_core nvidia_agp agpgart dv1394 evdev ext3 jbd mbcache sg sd_mod ide_cd cdrom usbhid hid amd74xx ide_core sata_sil ohci1394 ieee1394 ata_generic libata scsi_mod forcedeth ehci_hcd ohci_hcd usbcore thermal processor fan fuse apparmor commoncap[ 484.858978] CPU: 0[ 484.858979] EIP: 0060:[] Not tainted VLI[ 484.858981] EFLAGS: 00010293 (2.6.22-14-generic #1)[ 484.858999] EIP is at dvb_device_open+0x3a/0x120 [dvb_core][ 484.859002] eax: eafcfc04 ebx: 76697264 ecx: f8ce6600 edx: 00000003[ 484.859006] esi: 00000000 edi: eafcfc0c ebp: eafcfc00 esp: ea123ec0[ 484.859009] ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068[ 484.859012] Process scan (pid: 5981, ti=ea122000 task=ea766f90 task.ti=ea122000)[ 484.859015] Stack: ec9ae960 eb2aa8d0 00000003 f8cd35d0 f8ce65a0 00000000 eb2aa8d0 c0183466 [ 484.859021] ec9ae960 00000003 ec9ae960 eb2aa8d0 00000000 c01833c0 c017ec48 dff5ac00 [ 484.859028] e9a2c440 ec9ae960 ffffff9c ea123f30 00000003 c017ee05 ec9ae960 00000000 [ 484.859034] Call Trace:[ 484.859038] [] dvb_device_open+0x0/0x120 [dvb_core][ 484.859048] [] chrdev_open+0xa6/0x190[ 484.859058] [] chrdev_open+0x0/0x190[ 484.859062] [] __dentry_open+0xb8/0x1c0[ 484.859073] [] nameidata_to_filp+0x35/0x40[ 484.859079] [] do_filp_open+0x50/0x60[ 484.859085] [] schedule+0x2ca/0x890[ 484.859099] [] do_sys_open+0x4e/0xf0[ 484.859105] [] sys_write+0x41/0x70[ 484.859110] [] sys_open+0x1c/0x20[ 484.859114] [] sysenter_past_esp+0x6b/0xa9[ 484.859128] =======================[ 484.859129] Code: 50 34 a1 6c 66 ce f8 81 e2 ff ff 0f 00 89 54 24 08 eb 02 89 d8 8b 18 0f 18 03 90 3d 6c 66 ce f8 74 35 8d 68 fc 8b 75 0c 8d 78 08 <8b> 0e 0f 18 01 90 39 fe 74 de 8b 46 14 8b 55 00 c1 e0 04 0b 46 [ 484.859154] EIP: [] dvb_device_open+0x3a/0x120 [dvb_core] SS:ESP 0068:ea123ec0 Since dvb_device_open is a function of the dvb_core, I'm guessing the function is ok and there's something wrong with my part of the code. But, as far as I can see, I never explicitly call or register the function, so there's probably something wrong with the initialisation. I don't really see what can go wrong, so if any of you guys can give me some hints/tips to what I should pay extra attention, this is really appreciated. Greetings, Ben ------=_NextPart_000_0036_01C873BA.38F46070 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable RE: Null pointer in dvb_device_open

Sorry for the messed-up dmesg-output, = hopefully this time it’s = better:

[  = 484.858908] BUG: unable to handle kernel NULL pointer dereference at = virtual address 00000000

[  = 484.858917]  printing eip:

[  = 484.858919] f8cd360a

[  = 484.858921] *pde =3D 00000000

[  = 484.858924] Oops: 0000 [#1]

[  = 484.858925] SMP

[  = 484.858928] Modules linked in: dvb_driver dvb_core ipv6 af_packet rfcomm = l2cap bluetooth ppdev cpufreq_ondemand cpufreq_stats cpufreq_powersave = cpufreq_userspace freq_table cpufreq_conservative sbs button ac = container dock video battery sbp2 lp snd_intel8x0 snd_ac97_codec = ac97_bus 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 parport_pc parport pcspkr snd_page_alloc = shpchp pci_hotplug i2c_nforce2 i2c_core nvidia_agp agpgart dv1394 evdev = ext3 jbd mbcache sg sd_mod ide_cd cdrom usbhid hid amd74xx ide_core = sata_sil ohci1394 ieee1394 ata_generic libata scsi_mod forcedeth = ehci_hcd ohci_hcd usbcore thermal processor fan fuse apparmor = commoncap

[  = 484.858978] CPU:    0

[  = 484.858979] EIP:    = 0060:[<f8cd360a>]    Not tainted = VLI

[  = 484.858981] EFLAGS: 00010293   (2.6.22-14-generic = #1)

[  = 484.858999] EIP is at dvb_device_open+0x3a/0x120 = [dvb_core]

[  = 484.859002] eax: eafcfc04   ebx: 76697264   ecx: = f8ce6600   edx: 00000003

[  = 484.859006] esi: 00000000   edi: eafcfc0c   ebp: = eafcfc00   esp: ea123ec0
[  484.859009] ds: 007b   es: = 007b   fs: 00d8  gs: 0033  ss: = 0068

[  = 484.859012] Process scan (pid: 5981, ti=3Dea122000 task=3Dea766f90 = task.ti=3Dea122000)

[  = 484.859015] Stack: ec9ae960 eb2aa8d0 00000003 f8cd35d0 f8ce65a0 00000000 = eb2aa8d0 c0183466

[  = 484.859021]        ec9ae960 00000003 = ec9ae960 eb2aa8d0 00000000 c01833c0 c017ec48 dff5ac00

[  = 484.859028]        e9a2c440 ec9ae960 = ffffff9c ea123f30 00000003 c017ee05 ec9ae960 00000000

[  = 484.859034] Call Trace:

[  = 484.859038]  [<f8cd35d0>] dvb_device_open+0x0/0x120 = [dvb_core]

[  = 484.859048]  [<c0183466>] = chrdev_open+0xa6/0x190

[  = 484.859058]  [<c01833c0>] = chrdev_open+0x0/0x190

[  = 484.859062]  [<c017ec48>] = __dentry_open+0xb8/0x1c0

[  = 484.859073]  [<c017ee05>] = nameidata_to_filp+0x35/0x40

[  = 484.859079]  [<c017ee60>] = do_filp_open+0x50/0x60

[  = 484.859085]  [<c02f20ea>] = schedule+0x2ca/0x890

[  = 484.859099]  [<c017eebe>] = do_sys_open+0x4e/0xf0

[  = 484.859105]  [<c01813b1>] = sys_write+0x41/0x70

[  = 484.859110]  [<c017ef9c>] = sys_open+0x1c/0x20

[  = 484.859114]  [<c01041d2>] = sysenter_past_esp+0x6b/0xa9

[  = 484.859128]  = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

[  = 484.859129] Code: 50 34 a1 6c 66 ce f8 81 e2 ff ff 0f 00 89 54 24 08 eb = 02 89 d8 8b 18 0f 18 03 90 3d 6c 66 ce f8 74 35 8d 68 fc 8b 75 0c 8d 78 = 08 <8b> 0e 0f 18 01 90 39 fe 74 de 8b 46 14 8b 55 00 c1 e0 04 0b = 46

[  = 484.859154] EIP: [<f8cd360a>] dvb_device_open+0x3a/0x120 = [dvb_core] SS:ESP 0068:ea123ec0

      _____________________________________________
      From: Ben Backx [mailto:ben@bbackx.com]
      Sent: 20 February 2008 = 12:07
      To: 'linux-dvb@linuxtv.org'
      Subject: Null pointer in dvb_device_open

      Hi,

      I’m = (still) developing a driver for a dvb-device, I’m making some = progress, but I’m currently stuck at a null-pointer in = dvb_device_open. The (relevant) dmesg-output:

      [  = 484.858908] BUG: unable to handle kernel NULL pointer dereference at = virtual address 00000000[  484.858917]  printing eip:[  = 484.858919] f8cd360a[  484.858921] *pde =3D 00000000[  = 484.858924] Oops: 0000 [#1][  484.858925] SMP [  484.858928] = Modules linked in: dvb_driver dvb_core ipv6 af_packet rfcomm l2cap = bluetooth ppdev cpufreq_ondemand cpufreq_stats cpufreq_powersave = cpufreq_userspace freq_table cpufreq_conservative sbs button ac = container dock video battery sbp2 lp snd_intel8x0 snd_ac97_codec = ac97_bus 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 parport_pc parport pcspkr snd_page_alloc = shpchp pci_hotplug i2c_nforce2 i2c_core nvidia_agp agpgart dv1394 evdev = ext3 jbd mbcache sg sd_mod ide_cd cdrom usbhid hid amd74xx ide_core = sata_sil ohci1394 ieee1394 ata_generic libata scsi_mod forcedeth = ehci_hcd ohci_hcd usbcore thermal processor fan fuse apparmor = commoncap[  484.858978] CPU:    0[  484.858979] = EIP:    0060:[<f8cd360a>]    Not = tainted VLI[  484.858981] EFLAGS: 00010293   = (2.6.22-14-generic #1)[  484.858999] EIP is at = dvb_device_open+0x3a/0x120 [dvb_core][  484.859002] eax: = eafcfc04   ebx: 76697264   ecx: f8ce6600   = edx: 00000003[  484.859006] esi: 00000000   edi: = eafcfc0c   ebp: eafcfc00   esp: ea123ec0[  = 484.859009] ds: 007b   es: 007b   fs: 00d8  gs: = 0033  ss: 0068[  484.859012] Process scan (pid: 5981, = ti=3Dea122000 task=3Dea766f90 task.ti=3Dea122000)[  484.859015] = Stack: ec9ae960 eb2aa8d0 00000003 f8cd35d0 f8ce65a0 00000000 eb2aa8d0 = c0183466 [  484.859021]        = ec9ae960 00000003 ec9ae960 eb2aa8d0 00000000 c01833c0 c017ec48 dff5ac00 = [  484.859028]        e9a2c440 = ec9ae960 ffffff9c ea123f30 00000003 c017ee05 ec9ae960 00000000 [  = 484.859034] Call Trace:[  484.859038]  [<f8cd35d0>] = dvb_device_open+0x0/0x120 [dvb_core][  484.859048]  = [<c0183466>] chrdev_open+0xa6/0x190[  484.859058]  = [<c01833c0>] chrdev_open+0x0/0x190[  484.859062]  = [<c017ec48>] __dentry_open+0xb8/0x1c0[  484.859073]  = [<c017ee05>] nameidata_to_filp+0x35/0x40[  484.859079]  = [<c017ee60>] do_filp_open+0x50/0x60[  484.859085]  = [<c02f20ea>] schedule+0x2ca/0x890[  484.859099]  = [<c017eebe>] do_sys_open+0x4e/0xf0[  484.859105]  = [<c01813b1>] sys_write+0x41/0x70[  484.859110]  = [<c017ef9c>] sys_open+0x1c/0x20[  484.859114]  = [<c01041d2>] sysenter_past_esp+0x6b/0xa9[  484.859128]  = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D[&nb= sp; 484.859129] Code: 50 34 a1 6c 66 ce f8 81 e2 ff ff 0f 00 89 54 24 08 = eb 02 89 d8 8b 18 0f 18 03 90 3d 6c 66 ce f8 74 35 8d 68 fc 8b 75 0c 8d = 78 08 <8b> 0e 0f 18 01 90 39 fe 74 de 8b 46 14 8b 55 00 c1 e0 04 = 0b 46 [  484.859154] EIP: [<f8cd360a>] = dvb_device_open+0x3a/0x120 [dvb_core] SS:ESP = 0068:ea123ec0

      Since = dvb_device_open is a function of the dvb_core, I’m guessing the = function is ok and there’s something wrong with my part of the = code. But, as far as I can see, I never explicitly call or register the = function, so there’s probably something wrong with the = initialisation. I don’t really see what can go wrong, so if any of = you guys can give me some hints/tips to what I should pay extra = attention, this is really appreciated.


      Greetings,

      Ben

------=_NextPart_000_0036_01C873BA.38F46070-- --===============0360927627== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb --===============0360927627==--