Hi, I am currently fiddling with some bug messages that I get using my module extensions. I'm glad that my system does not freeze at this stage, but I'm not clear how to read the certainly helpful output correctly. Especially the part »Fixing recursive fault but reboot is needed!« sounds like I am using a recursive call, but I am not aware of any such recursive call. I am working only on the files net/bluetooth/l2cap.c and include/net/bluetooth/l2cap.h -- you can find the files here: http://studwww.ira.uni-karlsruhe.de/~s_roehr/ for reference. Perhaps anybody has some helpful hints for me where I should look at primarily -- currently I'm a bit stuck. Here is the relevant part of the output: ------------------------------------8<--------------------------------------- Aug 31 12:56:33 bart kernel: [17179750.896000] l2cap_sock_sendmsg: sock cd960200, sk cd6e7a00 Aug 31 12:56:33 bart kernel: [17179750.896000] l2cap_segment_sdu: sk cd6e7a00 len 20 Aug 31 12:56:33 bart kernel: [17179750.896000] l2cap_do_send_rfc: sk cd6e7a00 occ 1 frames 1 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_recv_acldata: conn cea80900 len 16 flags 0x2 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_recv_frame: len 12, cid 0x0001 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_raw_recv: conn cea80900 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_sig_channel: code 0x04 len 8 id 0x0f Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_config_req: dcid 0x0040 flags 0x00 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_parse_conf_req: sk cd6e7a00 len 4 Aug 31 12:56:33 bart kernel: [17179750.904000] 01 02 FF 7F Aug 31 12:56:33 bart kernel: [17179750.904000] -> configure MTU Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_build_conf_rsp: sk cd6e7a00 complete 1 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_add_conf_opt: type 0x01 len 2 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_add_conf_opt: type 0x04 len 9 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_build_cmd: conn cea80900, code 0x05, ident 0x0f, len 21 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_send_cmd: code 0x05 Aug 31 12:56:33 bart kernel: [17179750.904000] 40 00 00 00 00 00 01 02 FF 7F 04 09 02 20 20 E8 03 E8 03 FB FF Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_build_conf_req: sk cd6e7a00 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_build_cmd: conn cea80900, code 0x04, ident 0x05, len 4 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_send_cmd: code 0x04 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_recv_acldata: conn cea80900 len 14 flags 0x2 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_recv_frame: len 10, cid 0x0001 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_raw_recv: conn cea80900 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_sig_channel: code 0x05 len 6 id 0x04 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_config_rsp: scid 0x0040 flags 0x00 result 0x00 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_chan_ready: sk cd6e7a00, parent 00000000 Aug 31 12:56:33 bart kernel: [17179750.904000] l2cap_sock_clear_timer: sock cd6e7a00 state 1 Aug 31 12:56:33 bart kernel: [17179750.908000] l2cap_recv_acldata: conn cea80900 len 12 flags 0x2 Aug 31 12:56:33 bart kernel: [17179750.908000] l2cap_recv_frame: len 8, cid 0x0001 Aug 31 12:56:33 bart kernel: [17179750.908000] l2cap_raw_recv: conn cea80900 Aug 31 12:56:33 bart kernel: [17179750.908000] l2cap_sig_channel: code 0x06 len 4 id 0x11 Aug 31 12:56:33 bart kernel: [17179750.908000] l2cap_disconnect_req: scid 0x0040 dcid 0x0040 Aug 31 12:56:33 bart kernel: [17179750.908000] l2cap_build_cmd: conn cea80900, code 0x07, ident 0x11, len 4 Aug 31 12:56:33 bart kernel: [17179750.908000] l2cap_send_cmd: code 0x07 Aug 31 12:56:33 bart kernel: [17179750.908000] l2cap_sock_clear_timer: sock cd6e7a00 state 1 Aug 31 12:56:33 bart kernel: [17179750.908000] l2cap_chan_del: sk cd6e7a00, conn cea80900, err 104 Aug 31 12:56:33 bart kernel: [17179750.916000] l2cap_sock_release: sock cd960200, sk cd6e7a00 Aug 31 12:56:33 bart kernel: [17179750.916000] l2cap_sock_shutdown: sock cd960200, sk cd6e7a00 Aug 31 12:56:33 bart kernel: [17179750.916000] l2cap_sock_kill: sk cd6e7a00 state 9 Aug 31 12:56:33 bart kernel: [17179750.916000] BUG: warning at include/net/sock.h:329/sk_del_node_init() Aug 31 12:56:33 bart kernel: [17179750.916000] <e0a0e37c> bt_sock_unlink+0x6c/0x70 [bluetooth] <e0cab21f> l2cap_sock_kill +0x4f/0x70 [l2cap] Aug 31 12:56:33 bart kernel: [17179750.916000] <e0cae307> l2cap_sock_release+0x77/0x90 [l2cap] <c02562b4> sock_release+0x14/0x70 Aug 31 12:56:33 bart kernel: [17179750.916000] <c025656e> sock_close +0x1e/0x50 <c015adf9> __fput+0x99/0x180 Aug 31 12:56:33 bart kernel: [17179750.916000] <c01580fe> filp_close +0x3e/0x80 <c01596de> sys_close+0x4e/0x60 Aug 31 12:56:33 bart kernel: [17179750.916000] <c0102dbb> sysenter_past_esp+0x54/0x79 Aug 31 12:56:33 bart kernel: [17179750.916000] l2cap_recv_acldata: conn cea80900 len 10 flags 0x2 Aug 31 12:56:33 bart kernel: [17179750.916000] l2cap_recv_frame: len 6, cid 0x0001 Aug 31 12:56:33 bart kernel: [17179750.916000] l2cap_raw_recv: conn cea80900 Aug 31 12:56:33 bart kernel: [17179750.916000] l2cap_sig_channel: code 0x01 len 2 id 0x05 Aug 31 12:56:33 bart kernel: [17179750.916000] l2cap_command_rej: reason 0x0002 Aug 31 12:56:33 bart kernel: [17179750.916000] l2cap_command_rej: invalid channel 0x0040 0x0000 Aug 31 12:56:34 bart kernel: [17179751.792000] c0259ae1 Aug 31 12:56:34 bart kernel: [17179751.792000] Modules linked in: rfcomm l2cap crc16 radeonfb i2c_algo_bit ipv6 speedstep_centrino cpufreq_userspace cpufreq_stats freq_table cpufreq_powersave cpufreq_ondemand cpufreq_conservative video tc1100_wmi sony_acpi pcc_acpi hotkey dev_acpi container button acpi_sbs battery ac i2c_acpi_ec i2c_core sbp2 scsi_mod lp af_packet snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer joydev shpchp pci_hotplug ipw2100 intel_agp b44 mii tsdev evdev pcmcia ieee80211 ieee80211_crypt snd soundcore snd_page_alloc hci_usb bluetooth agpgart parport_pc parport yenta_socket rsrc_nonstatic pcmcia_core serio_raw pcspkr psmouse rtc usbhid ext3 jbd ehci_hcd uhci_hcd usbcore ohci1394 ieee1394 ide_generic ide_cd cdrom ide_disk piix generic thermal processor fan fbcon tileblit font bitblit softcursor vesafb capability commoncap Aug 31 12:56:34 bart kernel: [17179751.792000] EIP: 0060:[skb_dequeue +17/64] Not tainted VLI Aug 31 12:56:34 bart kernel: [17179751.792000] EFLAGS: 00010087 (2.6.17-5-386 #3) Aug 31 12:56:35 bart kernel: [17179751.792000] <1>Fixing recursive fault but reboot is needed! Aug 31 12:56:35 bart kernel: [17179751.804000] c0259adc Aug 31 12:56:35 bart kernel: [17179751.804000] Modules linked in: rfcomm l2cap crc16 radeonfb i2c_algo_bit ipv6 speedstep_centrino cpufreq_userspace cpufreq_stats freq_table cpufreq_powersave cpufreq_ondemand cpufreq_conservative video tc1100_wmi sony_acpi pcc_acpi hotkey dev_acpi container button acpi_sbs battery ac i2c_acpi_ec i2c_core sbp2 scsi_mod lp af_packet snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer joydev shpchp pci_hotplug ipw2100 intel_agp b44 mii tsdev evdev pcmcia ieee80211 ieee80211_crypt snd soundcore snd_page_alloc hci_usb bluetooth agpgart parport_pc parport yenta_socket rsrc_nonstatic pcmcia_core serio_raw pcspkr psmouse rtc usbhid ext3 jbd ehci_hcd uhci_hcd usbcore ohci1394 ieee1394 ide_generic ide_cd cdrom ide_disk piix generic thermal processor fan fbcon tileblit font bitblit softcursor vesafb capability commoncap Aug 31 12:56:35 bart kernel: [17179751.804000] EIP: 0060:[skb_dequeue +12/64] Not tainted VLI Aug 31 12:56:35 bart kernel: [17179751.804000] EFLAGS: 00010086 (2.6.17-5-386 #3) Aug 31 12:56:35 bart kernel: [17179751.804000] <1>BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000 Aug 31 12:56:35 bart kernel: [17179751.836000] c0259adc Aug 31 12:56:35 bart kernel: [17179751.836000] Modules linked in: rfcomm l2cap crc16 radeonfb i2c_algo_bit ipv6 speedstep_centrino cpufreq_userspace cpufreq_stats freq_table cpufreq_powersave cpufreq_ondemand cpufreq_conservative video tc1100_wmi sony_acpi pcc_acpi hotkey dev_acpi container button acpi_sbs battery ac i2c_acpi_ec i2c_core sbp2 scsi_mod lp af_packet snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer joydev shpchp pci_hotplug ipw2100 intel_agp b44 mii tsdev evdev pcmcia ieee80211 ieee80211_crypt snd soundcore snd_page_alloc hci_usb bluetooth agpgart parport_pc parport yenta_socket rsrc_nonstatic pcmcia_core serio_raw pcspkr psmouse rtc usbhid ext3 jbd ehci_hcd uhci_hcd usbcore ohci1394 ieee1394 ide_generic ide_cd cdrom ide_disk piix generic thermal processor fan fbcon tileblit font bitblit softcursor vesafb capability commoncap Aug 31 12:56:35 bart kernel: [17179751.836000] EIP: 0060:[skb_dequeue +12/64] Not tainted VLI Aug 31 12:56:35 bart kernel: [17179751.836000] EFLAGS: 00010086 (2.6.17-5-386 #3) Aug 31 12:56:35 bart kernel: [17179751.836000] <1>Fixing recursive fault but reboot is needed! Aug 31 12:56:35 bart kernel: [17179751.884000] c02ba070 Aug 31 12:56:35 bart kernel: [17179751.884000] Modules linked in: rfcomm l2cap crc16 radeonfb i2c_algo_bit ipv6 speedstep_centrino cpufreq_userspace cpufreq_stats freq_table cpufreq_powersave cpufreq_ondemand cpufreq_conservative video tc1100_wmi sony_acpi pcc_acpi hotkey dev_acpi container button acpi_sbs battery ac i2c_acpi_ec i2c_core sbp2 scsi_mod lp af_packet snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer joydev shpchp pci_hotplug ipw2100 intel_agp b44 mii tsdev evdev pcmcia ieee80211 ieee80211_crypt snd soundcore snd_page_alloc hci_usb bluetooth agpgart parport_pc parport yenta_socket rsrc_nonstatic pcmcia_core serio_raw pcspkr psmouse rtc usbhid ext3 jbd ehci_hcd uhci_hcd usbcore ohci1394 ieee1394 ide_generic ide_cd cdrom ide_disk piix generic thermal processor fan fbcon tileblit font bitblit softcursor vesafb capability commoncap Aug 31 12:56:35 bart kernel: [17179751.884000] EIP: 0060:[unix_ioctl +128/208] Not tainted VLI Aug 31 12:56:35 bart kernel: [17179751.884000] EFLAGS: 00010246 (2.6.17-5-386 #3) Aug 31 12:56:35 bart kernel: [17179751.884000] <1>BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000 Aug 31 12:56:35 bart kernel: [17179751.912000] c0259b7f Aug 31 12:56:35 bart kernel: [17179751.912000] Modules linked in: rfcomm l2cap crc16 radeonfb i2c_algo_bit ipv6 speedstep_centrino cpufreq_userspace cpufreq_stats freq_table cpufreq_powersave cpufreq_ondemand cpufreq_conservative video tc1100_wmi sony_acpi pcc_acpi hotkey dev_acpi container button acpi_sbs battery ac i2c_acpi_ec i2c_core sbp2 scsi_mod lp af_packet snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer joydev shpchp pci_hotplug ipw2100 intel_agp b44 mii tsdev evdev pcmcia ieee80211 ieee80211_crypt snd soundcore snd_page_alloc hci_usb bluetooth agpgart parport_pc parport yenta_socket rsrc_nonstatic pcmcia_core serio_raw pcspkr psmouse rtc usbhid ext3 jbd ehci_hcd uhci_hcd usbcore ohci1394 ieee1394 ide_generic ide_cd cdrom ide_disk piix generic thermal processor fan fbcon tileblit font bitblit softcursor vesafb capability commoncap Aug 31 12:56:35 bart kernel: [17179751.912000] EIP: 0060:[skb_queue_tail+15/32] Not tainted VLI Aug 31 12:56:35 bart kernel: [17179751.912000] EFLAGS: 00010006 (2.6.17-5-386 #3) Aug 31 12:56:35 bart kernel: [17179751.912000] <1>BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000 Aug 31 12:56:35 bart kernel: [17179752.056000] c0259adc Aug 31 12:56:35 bart kernel: [17179752.056000] Modules linked in: rfcomm l2cap crc16 radeonfb i2c_algo_bit ipv6 speedstep_centrino cpufreq_userspace cpufreq_stats freq_table cpufreq_powersave cpufreq_ondemand cpufreq_conservative video tc1100_wmi sony_acpi pcc_acpi hotkey dev_acpi container button acpi_sbs battery ac i2c_acpi_ec i2c_core sbp2 scsi_mod lp af_packet snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer joydev shpchp pci_hotplug ipw2100 intel_agp b44 mii tsdev evdev pcmcia ieee80211 ieee80211_crypt snd soundcore snd_page_alloc hci_usb bluetooth agpgart parport_pc parport yenta_socket rsrc_nonstatic pcmcia_core serio_raw pcspkr psmouse rtc usbhid ext3 jbd ehci_hcd uhci_hcd usbcore ohci1394 ieee1394 ide_generic ide_cd cdrom ide_disk piix generic thermal processor fan fbcon tileblit font bitblit softcursor vesafb capability commoncap Aug 31 12:56:35 bart kernel: [17179752.056000] EIP: 0060:[skb_dequeue +12/64] Not tainted VLI Aug 31 12:56:35 bart kernel: [17179752.056000] EFLAGS: 00010086 (2.6.17-5-386 #3) Aug 31 12:56:35 bart kernel: [17179752.056000] <1>Fixing recursive fault but reboot is needed! Aug 31 12:56:35 bart kernel: [17179752.944000] l2cap_disconn_ind: hcon d565f5c0 reason 22 Aug 31 12:56:35 bart kernel: [17179752.944000] l2cap_conn_del: hcon d565f5c0 conn cea80900, err 103 ------------------------------------8<--------------------------------------- Thanks in advance for any helpful suggestions, Martin -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
