Hi, I am not sure whether to add this as a bug report. Recently ubuntu has freezed sometimes and I cannot do anything except the hard(!) shutdown. (Btw: I use the hard shutdown quite often after having unpluged an external monitor and reboot; it seems that after upgrading from 9.10 to 10.04 ubuntu does not realise the second screen was removed during the first boot; therefore I hard shutdown, restart and it works. Moreover the ctr+alt+bksp usually does not have any effect). The last three times the freeze happened was when using skype 2.1.0.81-1ubuntu5, firefox 3.6.13+build3+nobinonly-0ubuntu0.10.04.1 and maybe gnome-terminal2.30.2-0ubuntu1 (with some ssh conn.). So I had a log in /var/log/kern.log today, and it seem that at that times, when it freezed, there was following bug in the kernel: BUG: unable to handle kernel NULL pointer dereference at 0000005a Following there are the snapshot of the two of those bugs. I dont want to spam this report, but if necessary I can also upload the whole kern.log Does anyone understand what the problem is or if this is worth a bug report? Thanks a lot Horst FIRST: 14662 Jan 26 21:07:21 kernel: [ 123.504042] Clocksource tsc unstable (delta = -137538529 ns) 14663 Jan 26 21:08:54 kernel: [ 216.059659] ndiswrapper (iw_set_auth:1602): invalid cmd 12 14664 Jan 26 21:08:55 kernel: [ 217.849838] CE: hpet increasing min_delta_ns to 15000 nsec 14665 Jan 26 22:33:54 kernel: [ 5316.058207] ndiswrapper (iw_set_auth:1602): invalid cmd 12 14666 Jan 26 22:35:54 kernel: [ 5436.059177] ndiswrapper (iw_set_auth:1602): invalid cmd 12 14667 Jan 26 22:35:54 kernel: [ 5436.796176] BUG: unable to handle kernel NULL pointer dereference at 0000005a 14668 Jan 26 22:35:54 kernel: [ 5436.796197] IP: [] 0xf98f3905 14669 Jan 26 22:35:54 kernel: [ 5436.796218] *pde = bb613067 14670 Jan 26 22:35:54 kernel: [ 5436.796226] Oops: 0000 [#1] SMP 14671 Jan 26 22:35:54 kernel: [ 5436.796235] last sysfs file: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0A:00/power_supply/BAT0/voltage_now 14672 Jan 26 22:35:54 kernel: [ 5436.796245] Modules linked in: binfmt_misc rfcomm ppdev sco bridge stp bnep l2cap nls_iso8859_1 nls_cp437 vfat fat snd_hda_ 14673 Jan 26 22:35:54 kernel: [ 5436.796342] 14674 Jan 26 22:35:54 kernel: [ 5436.796353] Pid: 714, comm: ntos_wq Tainted: P (2.6.32-27-generic #49-Ubuntu) HP Pavilion tx2000 Notebook PC 14675 Jan 26 22:35:54 kernel: [ 5436.796363] EIP: 0060:[] EFLAGS: 00010246 CPU: 0 14676 Jan 26 22:35:54 kernel: [ 5436.796371] EIP is at 0xf98f3905 14677 Jan 26 22:35:54 kernel: [ 5436.796376] EAX: 00000000 EBX: fa7fe000 ECX: 00000000 EDX: ee114918 14678 Jan 26 22:35:54 kernel: [ 5436.796383] ESI: 00000000 EDI: 00000000 EBP: f09bdedc ESP: f09bde80 14679 Jan 26 22:35:54 kernel: [ 5436.796390] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 14680 Jan 26 22:35:54 kernel: [ 5436.796398] Process ntos_wq (pid: 714, ti=f09bc000 task=f71d72c0 task.ti=f09bc000) 14681 Jan 26 22:35:54 kernel: [ 5436.796403] Stack: 14682 Jan 26 22:35:54 kernel: [ 5436.796407] ef669800 00000002 fa7fe000 ffffffff 3ca7f7e5 0000013c 3c5c9c1c 0000013c 14683 Jan 26 22:35:54 kernel: [ 5436.796424] <0> f71d72c0 c2c08798 f71d72ec c2c08798 f09bdee8 c01481d8 3ca7f7e5 0000013c 14684 Jan 26 22:35:54 kernel: [ 5436.796441] <0> 004b5bc9 00000003 f09ae490 fa7fe000 00000002 f9928ec5 fa7fe000 f09bdef8 14685 Jan 26 22:35:54 kernel: [ 5436.796459] Call Trace: 14686 Jan 26 22:35:54 kernel: [ 5436.796478] [] ? dequeue_entity+0x1c8/0x220 14687 Jan 26 22:35:54 kernel: [ 5436.796531] [] ? kdpc_worker+0xb8/0x130 [ndiswrapper] 14688 Jan 26 22:35:54 kernel: [ 5436.796549] [] ? run_workqueue+0x8e/0x150 14689 Jan 26 22:35:54 kernel: [ 5436.796582] [] ? kdpc_worker+0x0/0x130 [ndiswrapper] 14690 Jan 26 22:35:54 kernel: [ 5436.796593] [] ? worker_thread+0x84/0xe0 14691 Jan 26 22:35:54 kernel: [ 5436.796605] [] ? autoremove_wake_function+0x0/0x50 14692 Jan 26 22:35:54 kernel: [ 5436.796614] [] ? worker_thread+0x0/0xe0 14693 Jan 26 22:35:54 kernel: [ 5436.796623] [] ? kthread+0x74/0x80 14694 Jan 26 22:35:54 kernel: [ 5436.796631] [] ? kthread+0x0/0x80 14695 Jan 26 22:35:54 kernel: [ 5436.796642] [] ? kernel_thread_helper+0x7/0x10 14696 Jan 26 22:35:54 kernel: [ 5436.796647] Code: 6a 04 8d 45 fc 50 57 57 68 b2 37 8f f9 53 e8 c3 75 ff ff 0f b6 86 8a 00 00 00 57 57 50 57 6a 07 56 6a 18 14697 Jan 26 22:35:54 kernel: [ 5436.796736] EIP: [] 0xf98f3905 SS:ESP 0068:f09bde80 14698 Jan 26 22:35:54 kernel: [ 5436.796751] CR2: 000000000000005a 14699 Jan 26 22:35:54 kernel: [ 5436.796760] ---[ end trace cf329ba1d0ba4771 ]--- 14700 Jan 26 22:40:04 kernel: imklog 4.2.0, log source = /proc/kmsg started. 14701 Jan 26 22:40:04 kernel: [ 0.000000] Initializing cgroup subsys cpuset 14702 Jan 26 22:40:04 kernel: [ 0.000000] Initializing cgroup subsys cpu SECOND: 2117 Jan 24 21:22:30 kernel: [26059.071363] ndiswrapper (iw_set_auth:1602): invalid cmd 12 2118 Jan 24 21:30:30 kernel: [26539.073708] ndiswrapper (iw_set_auth:1602): invalid cmd 12 2119 Jan 24 21:30:30 kernel: [26539.808146] BUG: unable to handle kernel NULL pointer dereference at 0000005a 2120 Jan 24 21:30:30 kernel: [26539.808169] IP: [] 0xf993a905 2121 Jan 24 21:30:30 kernel: [26539.808188] *pde = b15ec067 2122 Jan 24 21:30:30 kernel: [26539.808196] Oops: 0000 [#1] SMP 2123 Jan 24 21:30:30 kernel: [26539.808206] last sysfs file: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0A:00/power_supply/BAT0/voltage_now 2124 Jan 24 21:30:30 kernel: [26539.808216] Modules linked in: binfmt_misc rfcomm ppdev sco bridge stp bnep l2cap nls_iso8859_1 nls_cp437 vfat fat snd_hda_ 2125 Jan 24 21:30:30 kernel: [26539.808312] 2126 Jan 24 21:30:30 kernel: [26539.808323] Pid: 672, comm: ntos_wq Tainted: P (2.6.32-27-generic #49-Ubuntu) HP Pavilion tx2000 Notebook PC 2127 Jan 24 21:30:30 kernel: [26539.808332] EIP: 0060:[] EFLAGS: 00010246 CPU: 0 2128 Jan 24 21:30:30 kernel: [26539.808340] EIP is at 0xf993a905 2129 Jan 24 21:30:30 kernel: [26539.808345] EAX: 00000000 EBX: f99b6000 ECX: 00000000 EDX: ec123cd8 2130 Jan 24 21:30:30 kernel: [26539.808352] ESI: 00000000 EDI: 00000000 EBP: f2e2dedc ESP: f2e2de80 2131 Jan 24 21:30:30 kernel: [26539.808359] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 2132 Jan 24 21:30:30 kernel: [26539.808367] Process ntos_wq (pid: 672, ti=f2e2c000 task=f39ed940 task.ti=f2e2c000) 2133 Jan 24 21:30:30 kernel: [26539.808372] Stack: 2134 Jan 24 21:30:30 kernel: [26539.808376] f19e2800 00000002 f99b6000 ffffffff 24ee1fc6 00000497 24a2b9d7 00000497 2135 Jan 24 21:30:30 kernel: [26539.808392] <0> f39ed940 c2c08798 f39ed96c c2c08798 f2e2dee8 c01481d8 24ee1fc6 00000497 2136 Jan 24 21:30:30 kernel: [26539.808409] <0> 004b65ef 00000003 f2f04490 f99b6000 00000002 f996fec5 f99b6000 f2e2def8 2137 Jan 24 21:30:30 kernel: [26539.808427] Call Trace: 2138 Jan 24 21:30:30 kernel: [26539.808446] [] ? dequeue_entity+0x1c8/0x220 2139 Jan 24 21:30:30 kernel: [26539.808499] [] ? kdpc_worker+0xb8/0x130 [ndiswrapper] 2140 Jan 24 21:30:30 kernel: [26539.808516] [] ? run_workqueue+0x8e/0x150 2141 Jan 24 21:30:30 kernel: [26539.808547] [] ? kdpc_worker+0x0/0x130 [ndiswrapper] 2142 Jan 24 21:30:30 kernel: [26539.808559] [] ? worker_thread+0x84/0xe0 2143 Jan 24 21:30:30 kernel: [26539.808569] [] ? autoremove_wake_function+0x0/0x50 2144 Jan 24 21:30:30 kernel: [26539.808579] [] ? worker_thread+0x0/0xe0 2145 Jan 24 21:30:30 kernel: [26539.808588] [] ? kthread+0x74/0x80 2146 Jan 24 21:30:30 kernel: [26539.808596] [] ? kthread+0x0/0x80 2147 Jan 24 21:30:30 kernel: [26539.808607] [] ? kernel_thread_helper+0x7/0x10 2148 Jan 24 21:30:30 kernel: [26539.808612] Code: 6a 04 8d 45 fc 50 57 57 68 b2 a7 93 f9 53 e8 c3 75 ff ff 0f b6 86 8a 00 00 00 57 57 50 57 6a 07 56 6a 18 2149 Jan 24 21:30:30 kernel: [26539.808701] EIP: [] 0xf993a905 SS:ESP 0068:f2e2de80 2150 Jan 24 21:30:30 kernel: [26539.808715] CR2: 000000000000005a 2151 Jan 24 21:30:30 kernel: [26539.808734] ---[ end trace 0e0f172a752b8dab ]--- 2152 Jan 24 21:31:37 kernel: [26606.249002] BUG: soft lockup - CPU#1 stuck for 61s! [NetworkManager:955] 2153 Jan 24 21:31:37 kernel: [26606.249004] Modules linked in: binfmt_misc rfcomm ppdev sco bridge stp bnep l2cap nls_iso8859_1 nls_cp437 vfat fat snd_hda_ 2154 Jan 24 21:31:37 kernel: [26606.249004] 2155 Jan 24 21:31:37 kernel: [26606.249004] Pid: 955, comm: NetworkManager Tainted: P D (2.6.32-27-generic #49-Ubuntu) HP Pavilion tx2000 Notebook 2156 Jan 24 21:31:37 kernel: [26606.249004] EIP: 0060:[] EFLAGS: 00000202 CPU: 1 2157 Jan 24 21:31:37 kernel: [26606.249004] EIP is at NdisAcquireSpinLock+0x7c/0xb0 [ndiswrapper] 2158 Jan 24 21:31:37 kernel: [26606.249004] EAX: 00000001 EBX: c2e0de40 ECX: f2929e08 EDX: 00000002 2159 Jan 24 21:31:37 kernel: [26606.249004] ESI: f2f040ec EDI: f39ea640 EBP: f2929d50 ESP: f2929d44 2160 Jan 24 21:31:37 kernel: [26606.249004] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 2161 Jan 24 21:31:37 kernel: [26606.249004] CR0: 80050033 CR2: a7bff028 CR3: 32910000 CR4: 000006d0 2162 Jan 24 21:31:37 kernel: [26606.249004] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 2163 Jan 24 21:31:37 kernel: [26606.249004] DR6: ffff0ff0 DR7: 00000400 2164 Jan 24 21:31:37 kernel: [26606.249004] Call Trace: 2165 Jan 24 21:31:37 kernel: [26606.249004] [] ? default_spin_lock_flags+0x8/0x10 2166 Jan 24 21:31:37 kernel: [26606.249004] [] ? _spin_lock_irqsave+0x2f/0x50 2167 Jan 24 21:31:37 kernel: [26606.249004] [] ? mp_request+0x13a/0x330 [ndiswrapper] 2168 Jan 24 21:31:37 kernel: [26606.249004] [] ? get_ap_address+0x37/0x60 [ndiswrapper] 2169 Jan 24 21:31:37 kernel: [26606.249004] [] ? iw_get_ap_address+0x1b/0x40 [ndiswrapper] 2170 Jan 24 21:31:37 kernel: [26606.249004] [] ? ioctl_standard_call+0x5d/0x100 2171 Jan 24 21:31:37 kernel: [26606.249004] [] ? T.784+0xc2/0x150 2172 Jan 24 21:31:37 kernel: [26606.249004] [] ? iw_get_ap_address+0x0/0x40 [ndiswrapper] 2173 Jan 24 21:31:37 kernel: [26606.249004] [] ? wext_handle_ioctl+0x60/0xc0 2174 Jan 24 21:31:37 kernel: [26606.249004] [] ? dev_ioctl+0x614/0x720 2175 Jan 24 21:31:37 kernel: [26606.249004] [] ? inotify_d_instantiate+0x45/0x60 2176 Jan 24 21:31:37 kernel: [26606.249004] [] ? __d_instantiate+0x9c/0xd0 2177 Jan 24 21:31:37 kernel: [26606.249004] [] ? security_d_instantiate+0x18/0x30 2178 Jan 24 21:31:37 kernel: [26606.249004] [] ? sock_ioctl+0x1d3/0x270 2179 Jan 24 21:31:37 kernel: [26606.249004] [] ? sock_ioctl+0x0/0x270 2180 Jan 24 21:31:37 kernel: [26606.249004] [] ? vfs_ioctl+0x21/0x90 2181 Jan 24 21:31:37 kernel: [26606.249004] [] ? do_vfs_ioctl+0x79/0x310 2182 Jan 24 21:31:37 kernel: [26606.249004] [] ? copy_to_user+0x39/0x130 2183 Jan 24 21:31:37 kernel: [26606.249004] [] ? sys_ioctl+0x67/0x80 2184 Jan 24 21:31:37 kernel: [26606.249004] [] ? syscall_call+0x7/0xb 2185 Jan 24 21:32:42 kernel: [26671.749005] BUG: soft lockup - CPU#1 stuck for 61s! [NetworkManager:955] 2186 Jan 24 21:32:42 kernel: [26671.749005] Modules linked in: binfmt_misc rfcomm ppdev sco bridge stp bnep l2cap nls_iso8859_1 nls_cp437 vfat fat snd_hda_ 2187 Jan 24 21:32:42 kernel: [26671.749005] 2188 Jan 24 21:32:42 kernel: [26671.749005] Pid: 955, comm: NetworkManager Tainted: P D (2.6.32-27-generic #49-Ubuntu) HP Pavilion tx2000 Notebook 2189 Jan 24 21:32:42 kernel: [26671.749005] EIP: 0060:[] EFLAGS: 00000202 CPU: 1 2190 Jan 24 21:32:42 kernel: [26671.749005] EIP is at NdisAcquireSpinLock+0x7f/0xb0 [ndiswrapper] 2191 Jan 24 21:32:42 kernel: [26671.749005] EAX: 00000001 EBX: c2e0de40 ECX: f2929e08 EDX: 00000002 2192 Jan 24 21:32:42 kernel: [26671.749005] ESI: f2f040ec EDI: f39ea640 EBP: f2929d50 ESP: f2929d44 2193 Jan 24 21:32:42 kernel: [26671.749005] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 2194 Jan 24 21:32:42 kernel: [26671.749005] CR0: 80050033 CR2: a7bff028 CR3: 32910000 CR4: 000006d0 2195 Jan 24 21:32:42 kernel: [26671.749005] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 2196 Jan 24 21:32:42 kernel: [26671.749005] DR6: ffff0ff0 DR7: 00000400 2197 Jan 24 21:32:42 kernel: [26671.749005] Call Trace: 2198 Jan 24 21:32:42 kernel: [26671.749005] [] ? default_spin_lock_flags+0x8/0x10 2199 Jan 24 21:32:42 kernel: [26671.749005] [] ? _spin_lock_irqsave+0x2f/0x50 2200 Jan 24 21:32:42 kernel: [26671.749005] [] ? mp_request+0x13a/0x330 [ndiswrapper] 2201 Jan 24 21:32:42 kernel: [26671.749005] [] ? get_ap_address+0x37/0x60 [ndiswrapper] 2202 Jan 24 21:32:42 kernel: [26671.749005] [] ? iw_get_ap_address+0x1b/0x40 [ndiswrapper] 2203 Jan 24 21:32:42 kernel: [26671.749005] [] ? ioctl_standard_call+0x5d/0x100 2204 Jan 24 21:32:42 kernel: [26671.749005] [] ? T.784+0xc2/0x150 2205 Jan 24 21:32:42 kernel: [26671.749005] [] ? iw_get_ap_address+0x0/0x40 [ndiswrapper] 2206 Jan 24 21:32:42 kernel: [26671.749005] [] ? wext_handle_ioctl+0x60/0xc0 2207 Jan 24 21:32:42 kernel: [26671.749005] [] ? dev_ioctl+0x614/0x720 2208 Jan 24 21:32:42 kernel: [26671.749005] [] ? inotify_d_instantiate+0x45/0x60 2209 Jan 24 21:32:42 kernel: [26671.749005] [] ? __d_instantiate+0x9c/0xd0 2210 Jan 24 21:32:42 kernel: [26671.749005] [] ? security_d_instantiate+0x18/0x30 2211 Jan 24 21:32:42 kernel: [26671.749005] [] ? sock_ioctl+0x1d3/0x270 2212 Jan 24 21:32:42 kernel: [26671.749005] [] ? sock_ioctl+0x0/0x270 2213 Jan 24 21:32:42 kernel: [26671.749005] [] ? vfs_ioctl+0x21/0x90 2214 Jan 24 21:32:42 kernel: [26671.749005] [] ? do_vfs_ioctl+0x79/0x310 2215 Jan 24 21:32:42 kernel: [26671.749005] [] ? copy_to_user+0x39/0x130 2216 Jan 24 21:32:42 kernel: [26671.749005] [] ? sys_ioctl+0x67/0x80 2217 Jan 24 21:32:42 kernel: [26671.749005] [] ? syscall_call+0x7/0xb 2218 Jan 24 21:35:22 kernel: imklog 4.2.0, log source = /proc/kmsg started. 2219 Jan 24 21:35:23 kernel: [ 0.000000] Initializing cgroup subsys cpuset

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