Hi all, The following message appeared during bootup. May I know if this a known issue? I did not meet this problem in 4.8-rcx, My desktop becomes unstable after bootup now. thanks. [ 22.594649] BUG: unable to handle kernel paging request at 0000000180040100 [ 22.601639] IP: [] kmem_cache_alloc_trace+0x7b/0x1c0 [ 22.608183] PGD 0 [ 22.611519] Oops: 0000 [#1] SMP [ 22.614659] Modules linked in: snd_hda_codec_hdmi nls_iso8859_1 snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core intel_rapl x86_pkg_temp_thermal snd_pcm intel_powerclamp snd_hwdep snd_seq_midi coretemp snd_seq_midi_event crct10dif_pclmul snd_rawmidi crc32_pclmul snd_seq ghash_clmulni_intel snd_timer snd_seq_device cryptd joydev input_leds serio_raw lpc_ich snd mei_me soundcore mei mac_hid shpchp parport_pc ppdev lp parport autofs4 hid_generic usbhid psmouse r8169 hid mii pata_acpi fjes video [ 22.662064] CPU: 0 PID: 2687 Comm: systemd-udevd Not tainted 4.9.0-rc1+ #3 [ 22.668935] Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./H61M-S2PH, BIOS F1 03/11/2013 [ 22.678844] task: ffff9a397d043900 task.stack: ffffa95b81f3c000 [ 22.684758] RIP: 0010:[] [] kmem_cache_alloc_trace+0x7b/0x1c0 [ 22.693730] RSP: 0018:ffffa95b81f3fdf0 EFLAGS: 00010206 [ 22.699044] RAX: 0000000000000000 RBX: 00000000024080c0 RCX: 000000000000e748 [ 22.706175] RDX: 000000000000e747 RSI: 00000000024080c0 RDI: 000000000001c520 [ 22.713306] RBP: ffffa95b81f3fe30 R08: ffff9a399ec1c520 R09: ffff9a3996003cc0 [ 22.720429] R10: 0000000180040100 R11: ffff9a397d043900 R12: 00000000024080c0 [ 22.727553] R13: ffffffff8f3a1453 R14: ffffffff8fc9982a R15: ffff9a3996003cc0 [ 22.734678] FS: 00007f778f5ca8c0(0000) GS:ffff9a399ec00000(0000) knlGS:0000000000000000 [ 22.742753] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.748491] CR2: 0000000180040100 CR3: 00000001fd1ed000 CR4: 00000000000406f0 [ 22.755615] Stack: [ 22.757625] ffffffff8fea7f60 ffffa95b81f3fe18 0000000000000002 ffff9a397fb61200 [ 22.765078] ffff9a397fb61200 ffffffff8fa35c20 ffffffff8fc9982a 000055e4b443d028 [ 22.772531] ffffa95b81f3fe48 ffffffff8f3a1453 ffffffff8fea7f60 ffffa95b81f3fe68 [ 22.779983] Call Trace: [ 22.782433] [] apparmor_file_alloc_security+0x23/0x40 [ 22.789130] [] security_file_alloc+0x33/0x50 [ 22.795049] [] get_empty_filp+0x9a/0x1c0 [ 22.800621] [] alloc_file+0x1b/0xc0 [ 22.805759] [] anon_inode_getfile+0xd9/0x150 [ 22.811669] [] SyS_epoll_create1+0x79/0xe0 [ 22.817407] [] entry_SYSCALL_64_fastpath+0x1e/0xad [ 22.823836] Code: 08 65 4c 03 05 97 47 e0 70 49 83 78 10 00 4d 8b 10 0f 84 f0 00 00 00 4d 85 d2 0f 84 e7 00 00 00 49 63 41 20 48 8d 4a 01 49 8b 39 <49> 8b 1c 02 4c 89 d0 65 48 0f c7 0f 0f 94 c0 84 c0 74 bb 49 63 [ 22.843785] RIP [] kmem_cache_alloc_trace+0x7b/0x1c0 [ 22.850407] RSP [ 22.853890] CR2: 0000000180040100 [ 22.857272] ---[ end trace aa2a9696006788ce ]--- [ 22.868212] BUG: unable to handle kernel NULL pointer dereference at 0000000000000805 [ 22.876069] IP: [] kmem_cache_alloc_trace+0x7b/0x1c0 [ 22.882612] PGD 1fd1f3067 [ 22.885142] PUD 2145e2067 [ 22.887855] PMD 0 [ 22.889892] Oops: 0000 [#2] SMP [ 22.893029] Modules linked in: snd_hda_codec_hdmi nls_iso8859_1 snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core intel_rapl x86_pkg_temp_thermal snd_pcm intel_powerclamp snd_hwdep snd_seq_midi coretemp snd_seq_midi_event crct10dif_pclmul snd_rawmidi crc32_pclmul snd_seq ghash_clmulni_intel snd_timer snd_seq_device cryptd joydev input_leds serio_raw lpc_ich snd mei_me soundcore mei mac_hid shpchp parport_pc ppdev lp parport autofs4 hid_generic usbhid psmouse r8169 hid mii pata_acpi fjes video [ 22.940418] CPU: 0 PID: 2702 Comm: cp Tainted: G D 4.9.0-rc1+ #3 [ 22.947548] Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./H61M-S2PH, BIOS F1 03/11/2013 [ 22.957445] task: ffff9a397d23b900 task.stack: ffffa95b81f5c000 [ 22.963355] RIP: 0010:[] [] kmem_cache_alloc_trace+0x7b/0x1c0 [ 22.972325] RSP: 0018:ffffa95b81f5fc50 EFLAGS: 00010206 [ 22.977628] RAX: 0000000000000000 RBX: 00000000024080c0 RCX: 000000000000e798 [ 22.984753] RDX: 000000000000e797 RSI: 00000000024080c0 RDI: 000000000001c520 [ 22.991875] RBP: ffffa95b81f5fc90 R08: ffff9a399ec1c520 R09: ffff9a3996003cc0 [ 22.999001] R10: 0000000000000805 R11: fefefefefefefeff R12: 00000000024080c0 [ 23.006125] R13: ffffffff8f3a1453 R14: 00007f1c701fc040 R15: ffff9a3996003cc0 [ 23.013249] FS: 0000000000000000(0000) GS:ffff9a399ec00000(0000) knlGS:0000000000000000 [ 23.021324] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.027063] CR2: 0000000000000805 CR3: 00000001fd261000 CR4: 00000000000406f0 [ 23.034186] Stack: [ 23.036196] ffffa95b81f5fc50 ffffa95b81f5fc50 0000000000000002 ffff9a397d21a400 [ 23.043649] ffff9a397d21a400 ffffa95b81f5fef4 00007f1c701fc040 00007f1c701fd510 [ 23.051101] ffffa95b81f5fca8 ffffffff8f3a1453 ffffffff8fea7f60 ffffa95b81f5fcc8 [ 23.058556] Call Trace: [ 23.061001] [] apparmor_file_alloc_security+0x23/0x40 [ 23.067692] [] security_file_alloc+0x33/0x50 [ 23.073602] [] get_empty_filp+0x9a/0x1c0 [ 23.079164] [] path_openat+0x40/0x1440 [ 23.084555] [] ? __alloc_pages_nodemask+0x137/0x300 [ 23.091073] [] do_filp_open+0x91/0x100 [ 23.096464] [] ? lru_cache_add_active_or_unevictable+0x36/0xb0 [ 23.103935] [] ? handle_mm_fault+0xffb/0x14a0 [ 23.109941] [] ? getname_flags+0x56/0x1f0 [ 23.115598] [] ? kmem_cache_alloc+0x156/0x1b0 [ 23.121595] [] ? __alloc_fd+0x46/0x170 [ 23.126985] [] do_sys_open+0x124/0x210 [ 23.132375] [] SyS_open+0x1e/0x20 [ 23.137335] [] entry_SYSCALL_64_fastpath+0x1e/0xad [ 23.143773] Code: 08 65 4c 03 05 97 47 e0 70 49 83 78 10 00 4d 8b 10 0f 84 f0 00 00 00 4d 85 d2 0f 84 e7 00 00 00 49 63 41 20 48 8d 4a 01 49 8b 39 <49> 8b 1c 02 4c 89 d0 65 48 0f c7 0f 0f 94 c0 84 c0 74 bb 49 63 [ 23.163720] RIP [] kmem_cache_alloc_trace+0x7b/0x1c0 [ 23.170342] RSP [ 23.173827] CR2: 0000000000000805 [ 23.177198] ---[ end trace aa2a9696006788cf ]---