Hi, this happened while I removed my battery on bootup. Complete dmesg is attached. Kernel is 2.6.24-rc1-git of yesterday (last commit was d919fd433b5823d1cf9d0688eb2eec183de9b74c). Greetings, Eike BUG: unable to handle kernel NULL pointer dereference at virtual address 0000001c printing eip: c02a82cb *pde = 00000000 Oops: 0000 [#1] SMP Modules linked in: iptable_filter ip_tables ip6table_filter ip6_tables x_tables ipv6 af_packet cpufreq_conservative cpufreq_ondemand cpufreq_userspace cpufreq_powersave acpi_cpufreq speedstep_lib freq_table snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device twofish twofish_common cbc blkcipher dm_crypt nls_utf8 ntfs ext3 jbd loop mmc_block pcmcia container battery iwl3945 firmware_class yenta_socket button ohci1394 backlight output ac power_supply rsrc_nonstatic pcmcia_core mmc_core ieee1394 intel_agp joydev agpgart snd_hda_intel sr_mod cdrom r8169 snd_pcm snd_timer mac80211 snd soundcore snd_page_alloc i2c_i801 i2c_core cfg80211 serio_raw sg usbhid ehci_hcd uhci_hcd sd_mod usbcore dm_snapshot edd dm_mod fan ata_piix libata scsi_mod thermal processor Pid: 47, comm: kacpi_notify Not tainted (2.6.24-rc1-git #68) EIP: 0060:[] EFLAGS: 00010286 CPU: 0 EIP is at klist_del+0xc/0x39 EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000 ESI: c2e2bc00 EDI: c2e2bc20 EBP: c1c88d7c ESP: c1c88d70 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 Process kacpi_notify (pid: 47, ti=c1c88000 task=c1cb5350 task.ti=c1c88000) Stack: c2e2bc00 c2e2bc00 c1ce960c c1c88d90 c0231ab6 c2e2bc00 c2e2ba00 c1c88e1c c1c88d9c c0231ced c2e2ba1c c1c88da8 f8bee01a c2e2ba00 c1c88db4 f8c3904b c2e2ba00 c1c88de4 f8c391a2 c01d47bc c01d47bc 00000001 00000000 000080d0 Call Trace: [] show_trace_log_lvl+0x1a/0x2f [] show_stack_log_lvl+0x9b/0xa3 [] show_registers+0xa7/0x179 [] die+0x114/0x1f5 [] do_page_fault+0x4b0/0x589 [] error_code+0x72/0x78 [] device_del+0x1a/0x246 [] device_unregister+0xb/0x15 [] power_supply_unregister+0x1a/0x1d [power_supply] [] sysfs_remove_battery+0x1f/0x22 [battery] [] acpi_battery_update+0x3f/0x255 [battery] [] acpi_battery_get_property+0x2b/0x149 [battery] [] power_supply_show_property+0x32/0xf0 [power_supply] [] power_supply_uevent+0xfd/0x187 [power_supply] [] dev_uevent+0xca/0xe8 [] kobject_uevent_env+0x15a/0x376 [] kobject_uevent+0xa/0xc [] device_del+0x21d/0x246 [] device_unregister+0xb/0x15 [] power_supply_unregister+0x1a/0x1d [power_supply] [] sysfs_remove_battery+0x1f/0x22 [battery] [] acpi_battery_update+0x3f/0x255 [battery] [] acpi_battery_notify+0x1e/0x73 [battery] [] acpi_ev_notify_dispatch+0x4f/0x5a [] acpi_os_execute_notify+0x24/0x2f [] run_workqueue+0x7d/0x110 [] worker_thread+0xbe/0xcd [] kthread+0x3b/0x64 [] kernel_thread_helper+0x7/0x10 ======================= Code: 08 e8 63 20 00 00 83 7d f0 00 74 09 85 ff 74 05 89 f8 ff 55 f0 8b 45 ec 5a 59 5b 5e 5f 5d c3 55 89 e5 57 89 c7 56 53 8b 18 89 d8 <8b> 73 1c e8 7b 20 00 00 89 f8 e8 58 ff ff ff 85 c0 b8 00 00 00 EIP: [] klist_del+0xc/0x39 SS:ESP 0068:c1c88d70 CPU0 attaching NULL sched-domain. CPU1 attaching NULL sched-domain. CPU0 attaching sched-domain: domain 0: span 3 groups: 1 2 CPU1 attaching sched-domain: domain 0: span 3 groups: 2 1 BUG: unable to handle kernel NULL pointer dereference at virtual address 0000001c printing eip: c02a82cb *pde = 00000000 Oops: 0000 [#2] SMP Modules linked in: iptable_filter ip_tables ip6table_filter ip6_tables x_tables ipv6 af_packet cpufreq_conservative cpufreq_ondemand cpufreq_userspace cpufreq_powersave acpi_cpufreq speedstep_lib freq_table snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device twofish twofish_common cbc blkcipher dm_crypt nls_utf8 ntfs ext3 jbd loop mmc_block pcmcia container battery iwl3945 firmware_class yenta_socket button ohci1394 backlight output ac power_supply rsrc_nonstatic pcmcia_core mmc_core ieee1394 intel_agp joydev agpgart snd_hda_intel sr_mod cdrom r8169 snd_pcm snd_timer mac80211 snd soundcore snd_page_alloc i2c_i801 i2c_core cfg80211 serio_raw sg usbhid ehci_hcd uhci_hcd sd_mod usbcore dm_snapshot edd dm_mod fan ata_piix libata scsi_mod thermal processor Pid: 2773, comm: hald Tainted: G D (2.6.24-rc1-git #68) EIP: 0060:[] EFLAGS: 00010286 CPU: 1 EIP is at klist_del+0xc/0x39 EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000 ESI: c2e2bc00 EDI: c2e2bc20 EBP: c33b9e8c ESP: c33b9e80 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 Process hald (pid: 2773, ti=c33b9000 task=c3304d30 task.ti=c33b9000) Stack: c2e2bc00 c2e2bc00 c1ce960c c33b9ea0 c0231ab6 c2e2bc00 c2e2ba00 00000001 c33b9eac c0231ced c2e2ba1c c33b9eb8 f8bee01a c2e2ba00 c33b9ec4 f8c3904b c39b3ec0 c33b9ef4 f8c391a2 c0163a98 c27f1cbc 00000246 c3bf9cf8 c33b9efc Call Trace: [] show_trace_log_lvl+0x1a/0x2f [] show_stack_log_lvl+0x9b/0xa3 [] show_registers+0xa7/0x179 [] die+0x114/0x1f5 [] do_page_fault+0x4b0/0x589 [] error_code+0x72/0x78 [] device_del+0x1a/0x246 [] device_unregister+0xb/0x15 [] power_supply_unregister+0x1a/0x1d [power_supply] [] sysfs_remove_battery+0x1f/0x22 [battery] [] acpi_battery_update+0x3f/0x255 [battery] [] acpi_battery_read+0x11/0x20 [battery] [] acpi_battery_read_state+0xf/0x11 [battery] [] seq_read+0xea/0x264 [] proc_reg_read+0x63/0x76 [] vfs_read+0xa6/0x12f [] sys_read+0x3d/0x61 [] sysenter_past_esp+0x5f/0x85 ======================= Code: 08 e8 63 20 00 00 83 7d f0 00 74 09 85 ff 74 05 89 f8 ff 55 f0 8b 45 ec 5a 59 5b 5e 5f 5d c3 55 89 e5 57 89 c7 56 53 8b 18 89 d8 <8b> 73 1c e8 7b 20 00 00 89 f8 e8 58 ff ff ff 85 c0 b8 00 00 00 EIP: [] klist_del+0xc/0x39 SS:ESP 0068:c33b9e80