Kevin, does 4.6.2 provide a test to this issue? If not, please test successively earlier kernels to see if a newer version may be tested against.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1589837 Title: Kernel oops - BUG: unable to handle kernel NULL pointer dereference at 00000000000000e4 Status in linux package in Ubuntu: Incomplete Bug description: Regarding the dmesg from the crashdump: [ 2210.842592] BUG: unable to handle kernel NULL pointer dereference at 00000000000000e4 [ 2210.842631] IP: [<ffffffff816fead6>] sock_poll+0x26/0x120 [ 2210.842659] PGD 0 [ 2210.842670] Oops: 0000 [#1] SMP [ 2210.842687] Modules linked in: drbg ansi_cprng cdc_ether usbnet r8152 mii nvram rfcomm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) xt_tcpudp bridge stp llc vboxdrv(OE) iptable_filter ip_tables x_tables msr bnep btusb btrtl btbcm btintel bluetooth input_leds joydev bcm5974 nls_iso8859_1 applesmc input_polldev brcmfmac snd_hda_codec_hdmi snd_hda_codec_cirrus snd_hda_codec_generic brcmutil cfg80211 thunderbolt bdc_pci intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd intel_pch_thermal lpc_ich snd_hda_intel snd_hda_codec snd_hda_core [ 2210.843039] snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer mei_me snd mei shpchp soundcore sbs sbshc acpi_als kfifo_buf apple_bl industrialio mac_hid spi_pxa2xx_platform facetimehd(OE) videobuf2_dma_sg videobuf2_memops videobuf2_v4l2 videobuf2_core v4l2_common videodev media parport_pc ppdev lp parport autofs4 hid_generic hid_apple usbhid hid uas usb_storage i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ahci libahci drm fjes video [ 2210.843180] CPU: 3 PID: 3991 Comm: Chrome_IOThread Tainted: G OE 4.4.0-22-generic #40-Ubuntu [ 2210.843202] Hardware name: Apple Inc. MacBookPro12,1/Mac-E43C1C25D4880AD6, BIOS MBP121.88Z.0167.B14.1509281135 09/28/2015 [ 2210.843226] task: ffff8802611de040 ti: ffff880263a44000 task.ti: ffff880263a44000 [ 2210.843243] RIP: 0010:[<ffffffff816fead6>] [<ffffffff816fead6>] sock_poll+0x26/0x120 [ 2210.843264] RSP: 0018:ffff880263a47d68 EFLAGS: 00010246 [ 2210.843276] RAX: ffffffff81abcbe0 RBX: ffff88022dedf480 RCX: ffff88022c576918 [ 2210.843292] RDX: 0000000000000000 RSI: ffff880263a47db8 RDI: ffff880263c1cf00 [ 2210.843308] RBP: ffff880263a47d90 R08: 0000000000000000 R09: ffff880242c88c18 [ 2210.843324] R10: ffff880244293038 R11: ffff88025f54d8c0 R12: ffff880263a47db8 [ 2210.843340] R13: ffff880263c1cf00 R14: 0000000000000000 R15: 0000000000000000 [ 2210.843356] FS: 00007f4015e73700(0000) GS:ffff88026ecc0000(0000) knlGS:0000000000000000 [ 2210.843374] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2210.843388] CR2: 00000000000000e4 CR3: 00000000821fe000 CR4: 00000000003406e0 [ 2210.843404] Stack: [ 2210.843409] ffff880263a47e18 0000000000000000 00001ed61c429c00 ffff880263a47ea0 [ 2210.843429] ffff880124d99d98 ffff880263a47df8 ffffffff81254a50 ffff8800821d98a0 [ 2210.843448] ffff880263a47f18 ffff8800821d9840 0000000000000000 0000000000000019 [ 2210.843467] Call Trace: [ 2210.843476] [<ffffffff81254a50>] ep_send_events_proc+0xb0/0x1c0 [ 2210.843490] [<ffffffff812549a0>] ? ep_ptable_queue_proc+0xa0/0xa0 [ 2210.843505] [<ffffffff812553b9>] ep_scan_ready_list+0x99/0x1f0 [ 2210.843519] [<ffffffff81255718>] ep_poll+0x1d8/0x3d0 [ 2210.843532] [<ffffffff8120cad9>] ? vfs_write+0x149/0x1a0 [ 2210.843545] [<ffffffff81256ae8>] SyS_epoll_wait+0xb8/0xd0 [ 2210.843560] [<ffffffff818252f2>] entry_SYSCALL_64_fastpath+0x16/0x71 [ 2210.843574] Code: 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 45 31 ff 53 48 8b 9f d0 00 00 00 49 89 fd 49 89 f4 4c 8b 73 20 <41> 8b 96 e4 00 00 00 85 d2 0f 84 c2 00 00 00 41 8b 86 e0 00 00 [ 2210.843662] RIP [<ffffffff816fead6>] sock_poll+0x26/0x120 [ 2210.843679] RSP <ffff880263a47d68> [ 2210.843687] CR2: 00000000000000e4 the problem occurs since yesterday. probably related to http://googlechromereleases.blogspot.ch/2016/06/stable-channel-update_6.html ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-22-generic 4.4.0-22.40 ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8 Uname: Linux 4.4.0-22-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: kevin 2371 F.... pulseaudio /dev/snd/controlC1: kevin 2371 F.... pulseaudio Date: Tue Jun 7 09:38:44 2016 InstallationDate: Installed on 2016-03-01 (97 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) MachineType: Apple Inc. MacBookPro12,1 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic.efi.signed root=UUID=18e90ec4-bbea-4061-aa6a-a7a46445929d ro quiet splash crashkernel=384M-:128M vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.4.0-22-generic N/A linux-backports-modules-4.4.0-22-generic N/A linux-firmware 1.157 SourcePackage: linux UpgradeStatus: Upgraded to xenial on 2016-04-06 (61 days ago) dmi.bios.date: 09/28/2015 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP121.88Z.0167.B14.1509281135 dmi.board.name: Mac-E43C1C25D4880AD6 dmi.board.vendor: Apple Inc. dmi.board.version: MacBookPro12,1 dmi.chassis.type: 9 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-E43C1C25D4880AD6 dmi.modalias: dmi:bvnAppleInc.:bvrMBP121.88Z.0167.B14.1509281135:bd09/28/2015:svnAppleInc.:pnMacBookPro12,1:pvr1.0:rvnAppleInc.:rnMac-E43C1C25D4880AD6:rvrMacBookPro12,1:cvnAppleInc.:ct9:cvrMac-E43C1C25D4880AD6: dmi.product.name: MacBookPro12,1 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. 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