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 ]---
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