le to handle kernel NULL pointer dereference at 00000009 IP: [] acpi_ex_read_data_from_field+0x131/0x168 *pde = 00000000 Oops: 0000 [#1] SMP last sysfs file: /sys/devices/virtual/net/tun0/statistics/collisions Modules linked in: binfmt_misc rfcomm sco bnep ppdev l2cap ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables bridge stp kvm_intel kvm snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep arc4 snd_pcm_oss thinkpad_acpi snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi iwl3945 snd_rawmidi iwlcore snd_seq_midi_event pcmcia snd_seq snd_timer snd_seq_device psmouse mac80211 snd yenta_socket soundcore rsrc_nonstatic led_class nvram lp btusb parport pcmcia_core snd_page_alloc serio_raw cfg80211 bluetooth sha256_generic aes_i586 aes_generic dm_crypt fbcon tileblit font bitblit softcursor vga16fb vgastate radeon ttm drm_kms_helper drm video output ahci intel_agp agpgart i2c_algo_bit e1000e Pid: 24, comm: kacpi_notify Not tainted (2.6.32-20-generic #29-Ubuntu) 200773U EIP: 0060:[] EFLAGS: 00010286 CPU: 0 EIP is at acpi_ex_read_data_from_field+0x131/0x168 EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000 ESI: 00000000 EDI: f7153d70 EBP: f7153d50 ESP: f7153d38 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 Process kacpi_notify (pid: 24, ti=f7152000 task=f7134ce0 task.ti=f7152000) Stack: c0387642 00000010 e5195a70 e2c3fb84 f703b9b0 e2c3fa00 f7153d80 c038c577 <0> c07644ac 00000000 e5118520 e2c3fa00 f7153d9c f7016cc0 00000000 e2c3fb84 <0> e2c3fa00 e5118a20 f7153d9c c0387d28 00000004 e1b70170 e2c3fa00 e2c3fa00 Call Trace: [] ? acpi_ex_get_name_string+0x148/0x1b6 [] ? acpi_ex_resolve_node_to_value+0x193/0x220 [] ? acpi_ex_resolve_to_value+0x79/0x81 [] ? acpi_ds_evaluate_name_path+0x71/0xdc [] ? acpi_ds_exec_end_op+0x8a/0x38e [] ? acpi_ut_create_generic_state+0x32/0x4c [] ? acpi_ps_parse_loop+0x264/0x2c3 [] ? acpi_ps_parse_aml+0x8e/0x2a4 [] ? acpi_ps_execute_method+0x1c0/0x277 [] ? acpi_ns_evaluate+0xd1/0x18f [] ? acpi_evaluate_object+0xd6/0x1c5 [] ? acpi_battery_get_info+0x47/0xa4 [] ? acpi_battery_update+0x8e/0x177 [] ? __dequeue_entity+0x26/0x50 [] ? acpi_battery_notify+0x29/0x77 [] ? acpi_device_notify+0x17/0x1a [] ? acpi_ev_notify_dispatch+0x54/0x5f [] ? acpi_os_execute_deferred+0x22/0x2d [] ? run_workqueue+0x8e/0x150 [] ? acpi_os_execute_deferred+0x0/0x2d [] ? worker_thread+0x84/0xe0 [] ? autoremove_wake_function+0x0/0x50 [] ? worker_thread+0x0/0xe0 [] ? kthread+0x74/0x80 [] ? kthread+0x0/0x80 [] ? kernel_thread_helper+0x7/0x10 Code: 40 0c 00 00 00 00 c7 40 10 00 00 00 00 0f b6 43 09 89 55 f0 89 4d ec e8 11 49 00 00 8b 4d ec 89 d8 8b 55 f0 e8 78 17 00 00 89 c2 <0f> b6 43 09 89 55 f0 e8 b7 48 00 00 8b 55 f0 85 d2 74 0f 89 f0 EIP: [] acpi_ex_read_data_from_field+0x131/0x168 SS:ESP 0068:f7153d38 CR2: 0000000000000009 ---[ end trace c96b695209941283 ]---