I notice at 08:34 there is this (similar to bug 1087622):

Dec  7 08:34:51 ubuntu kernel: [   13.229526] BUG: unable to handle kernel paging request at ffffffffa0418f08
Dec  7 08:34:51 ubuntu kernel: [   13.229562] IP: [<ffffffff810fd2ca>] register_ftrace_event+0x7a/0x2b0
Dec  7 08:34:51 ubuntu kernel: [   13.229593] PGD 1c0d067 PUD 1c11063 PMD 10fa49067 PTE 0
Dec  7 08:34:51 ubuntu kernel: [   13.229619] Oops: 0000 [#1] SMP 
Dec  7 08:34:51 ubuntu kernel: [   13.229637] CPU 3 
Dec  7 08:34:51 ubuntu kernel: [   13.229645] Modules linked in: mac80211(+) kvm btusb bluetooth cfg80211 microcode(+) psmouse snd soundcore snd_page_alloc dell_laptop dell_wmi sparse_keymap ppdev mei lpc_ich tpm_tis parport_pc serio_raw dcdbas mac_hid lp parport hid_generic usbhid hid ghash_clmulni_intel aesni_intel cryptd aes_x86_64 firewire_ohci wmi firewire_core crc_itu_t sdhci_pci sdhci i915 drm_kms_helper drm e1000e i2c_algo_bit video
Dec  7 08:34:51 ubuntu kernel: [   13.229822] 
Dec  7 08:34:51 ubuntu kernel: [   13.229824] Pid: 693, comm: modprobe Not tainted 3.5.0-20-generic #31-Ubuntu Dell Inc. Latitude E6410/0667CC
Dec  7 08:34:51 ubuntu kernel: [   13.229863] RIP: 0010:[<ffffffff810fd2ca>]  [<ffffffff810fd2ca>] register_ftrace_event+0x7a/0x2b0
Dec  7 08:34:51 ubuntu kernel: [   13.229897] RSP: 0018:ffff880110b89dc8  EFLAGS: 00010286
Dec  7 08:34:51 ubuntu kernel: [   13.229919] RAX: ffffffffa0418ee8 RBX: ffffffffa04cf548 RCX: ffffffff81c39b90
Dec  7 08:34:51 ubuntu kernel: [   13.229946] RDX: 000000000000043d RSI: ffffffffa04cf558 RDI: ffffffff81c39b60
Dec  7 08:34:51 ubuntu kernel: [   13.229972] RBP: ffff880110b89dd8 R08: ffff880110e2e688 R09: ffff880110e2e5b8
Dec  7 08:34:51 ubuntu kernel: [   13.229999] R10: 000000000000000a R11: ffff880109f9e380 R12: ffffffffa04d2b00
Dec  7 08:34:51 ubuntu kernel: [   13.230025] R13: ffffffffa04d4000 R14: ffffffffa04cf520 R15: ffff880110e2e418
Dec  7 08:34:51 ubuntu kernel: [   13.230052] FS:  00007fae30f38700(0000) GS:ffff880117cc0000(0000) knlGS:0000000000000000
Dec  7 08:34:51 ubuntu kernel: [   13.230081] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Dec  7 08:34:51 ubuntu kernel: [   13.230102] CR2: ffffffffa0418f08 CR3: 0000000110aa7000 CR4: 00000000000007e0
Dec  7 08:34:51 ubuntu kernel: [   13.230130] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Dec  7 08:34:51 ubuntu kernel: [   13.230156] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Dec  7 08:34:51 ubuntu kernel: [   13.230183] Process modprobe (pid: 693, threadinfo ffff880110b88000, task ffff880110b1ae00)
Dec  7 08:34:51 ubuntu kernel: [   13.230212] Stack:
Dec  7 08:34:51 ubuntu kernel: [   13.230221]  ffffffffa04d2bc0 ffffffffa04d2b00 ffff880110b89de8 ffffffff811072dd
Dec  7 08:34:51 ubuntu kernel: [   13.230253]  ffff880110b89e58 ffffffff81107e01 ffff880110b89e08 ffff88011052ed80
Dec  7 08:34:51 ubuntu kernel: [   13.230283]  ffff880110e2e4e8 ffff880110e2e418 ffff880110e2e5b8 ffff880110e2e688
Dec  7 08:34:51 ubuntu kernel: [   13.230312] Call Trace:
Dec  7 08:34:51 ubuntu kernel: [   13.230325]  [<ffffffff811072dd>] trace_event_raw_init+0xd/0x20
Dec  7 08:34:51 ubuntu kernel: [   13.230349]  [<ffffffff81107e01>] __trace_add_event_call+0x41/0x4a0
Dec  7 08:34:51 ubuntu kernel: [   13.230374]  [<ffffffff811088ae>] trace_module_notify+0x1de/0x2d0
Dec  7 08:34:51 ubuntu kernel: [   13.230399]  [<ffffffff816876ad>] notifier_call_chain+0x4d/0x70
Dec  7 08:34:51 ubuntu kernel: [   13.230424]  [<ffffffff8107c5b8>] __blocking_notifier_call_chain+0x58/0x80
Dec  7 08:34:51 ubuntu kernel: [   13.230453]  [<ffffffff8107c5f6>] blocking_notifier_call_chain+0x16/0x20
Dec  7 08:34:51 ubuntu kernel: [   13.230480]  [<ffffffff810b5b15>] sys_init_module+0x75/0x230
Dec  7 08:34:51 ubuntu kernel: [   13.230504]  [<ffffffff8168b969>] system_call_fastpath+0x16/0x1b
Dec  7 08:34:51 ubuntu kernel: [   13.230526] Code: 0f 8f 23 01 00 00 8d 42 01 89 53 20 48 c7 c1 90 9b c3 81 89 05 c8 c8 b3 00 89 d0 83 e0 7f 48 8b 04 c5 40 7a cd 81 48 85 c0 74 1f <3b> 50 20 75 12 e9 dc 00 00 00 0f 1f 40 00 39 50 20 0f 84 cf 00 
Dec  7 08:34:51 ubuntu kernel: [   13.230682] RIP  [<ffffffff810fd2ca>] register_ftrace_event+0x7a/0x2b0
Dec  7 08:34:51 ubuntu kernel: [   13.230708]  RSP <ffff880110b89dc8>
Dec  7 08:34:51 ubuntu kernel: [   13.230721] CR2: ffffffffa0418f08
Dec  7 08:34:51 ubuntu kernel: [   13.251828] ---[ end trace 725a7579b4897d40 ]---