Thanks paying attention to this report. =============================================== Was there a prior kernel version where you were not having this particular problem? => I occasionnally get random (?) kernel panic since several month but it is the fist time it was followed with this bug report in dmesg
=============================================== Did this issue start happening after an update/upgrade? => I've not carefully memorised the last upgrade I made on the system but according to zgrep -h " upgrade " /var/log/dpkg.log* | sort | less I got : 2017-04-19 11:04:12 upgrade libdns-export162:amd64 1:9.10.3.dfsg.P4-8ubuntu1.5 1:9.10.3.dfsg.P4-8ubuntu1.6 2017-04-19 11:04:12 upgrade libisc-export160:amd64 1:9.10.3.dfsg.P4-8ubuntu1.5 1:9.10.3.dfsg.P4-8ubuntu1.6 2017-04-19 11:04:13 upgrade bind9-host:amd64 1:9.10.3.dfsg.P4-8ubuntu1.5 1:9.10.3.dfsg.P4-8ubuntu1.6 2017-04-19 11:04:13 upgrade dnsutils:amd64 1:9.10.3.dfsg.P4-8ubuntu1.5 1:9.10.3.dfsg.P4-8ubuntu1.6 2017-04-19 11:04:13 upgrade libbind9-140:amd64 1:9.10.3.dfsg.P4-8ubuntu1.5 1:9.10.3.dfsg.P4-8ubuntu1.6 2017-04-19 11:04:13 upgrade libdns162:amd64 1:9.10.3.dfsg.P4-8ubuntu1.5 1:9.10.3.dfsg.P4-8ubuntu1.6 2017-04-19 11:04:13 upgrade libisc160:amd64 1:9.10.3.dfsg.P4-8ubuntu1.5 1:9.10.3.dfsg.P4-8ubuntu1.6 2017-04-19 11:04:13 upgrade libisccc140:amd64 1:9.10.3.dfsg.P4-8ubuntu1.5 1:9.10.3.dfsg.P4-8ubuntu1.6 2017-04-19 11:04:13 upgrade libisccfg140:amd64 1:9.10.3.dfsg.P4-8ubuntu1.5 1:9.10.3.dfsg.P4-8ubuntu1.6 2017-04-19 11:04:13 upgrade liblwres141:amd64 1:9.10.3.dfsg.P4-8ubuntu1.5 1:9.10.3.dfsg.P4-8ubuntu1.6 2017-04-19 11:04:14 upgrade dnsmasq-base:amd64 2.75-1ubuntu0.16.04.1 2.75-1ubuntu0.16.04.2 2017-04-19 11:04:14 upgrade flashplugin-installer:amd64 25.0.0.127ubuntu0.16.04.1 25.0.0.148ubuntu0.16.04.1 2017-04-19 11:04:14 upgrade libwebkit2gtk-4.0-37-gtk2:amd64 2.14.5-0ubuntu0.16.04.1 2.16.1-0ubuntu0.16.04.1 2017-04-19 11:04:15 upgrade libwebkit2gtk-4.0-37:amd64 2.14.5-0ubuntu0.16.04.1 2.16.1-0ubuntu0.16.04.1 2017-04-19 11:04:16 upgrade libjavascriptcoregtk-4.0-18:amd64 2.14.5-0ubuntu0.16.04.1 2.16.1-0ubuntu0.16.04.1 2017-04-19 11:04:17 upgrade gir1.2-javascriptcoregtk-4.0:amd64 2.14.5-0ubuntu0.16.04.1 2.16.1-0ubuntu0.16.04.1 2017-04-19 11:04:17 upgrade gir1.2-webkit2-4.0:amd64 2.14.5-0ubuntu0.16.04.1 2.16.1-0ubuntu0.16.04.1 2017-04-21 11:05:03 upgrade distro-info-data:all 0.28ubuntu0.2 0.28ubuntu0.3 2017-04-21 11:05:03 upgrade firefox:amd64 52.0.2+build1-0ubuntu0.16.04.1 53.0+build6-0ubuntu0.16.04.1 2017-04-21 11:05:03 upgrade libfreetype6:amd64 2.6.1-0.1ubuntu2.1 2.6.1-0.1ubuntu2.2 2017-04-21 11:05:03 upgrade libfreetype6:i386 2.6.1-0.1ubuntu2.1 2.6.1-0.1ubuntu2.2 2017-04-21 11:05:07 upgrade firefox-locale-en:amd64 52.0.2+build1-0ubuntu0.16.04.1 53.0+build6-0ubuntu0.16.04.1 2017-04-21 11:05:07 upgrade firefox-locale-fr:amd64 52.0.2+build1-0ubuntu0.16.04.1 53.0+build6-0ubuntu0.16.04.1 =============================================== This morning I don't reproduce the bug. But I don't know if this is random or because I've tried something else before I read your anser : I had a non-working PCI TV-Card on My PC and removed it before boot. Dmesg is much more cleaner now but (again) I don't know if this is random or if if this was the cause of the bug... I join the new dmesg Should I wait to see if bug repeat in next days or would it be helpfull to follow the test you [Joseph Salisbury (jsalisbury)] requiered ? I'm OK to spend time on this if it can help. -- 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/1685613 Title: kernel Oops - BUG: unable to handle kernel NULL pointer dereference at 00000000000002e3; RIP [<ffffffff81031532>] show_stack_log_lvl+0x72/0x160 Status in linux package in Ubuntu: Incomplete Bug description: No problem to boot yesterday or previous days, but a kernel panic this afternoon. While rebooting, having a "kernel Oops" just after the boot. Following https://wiki.ubuntu.com/DebuggingKernelOops to report the bug but have no other clue to provide... ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-72-generic 4.4.0-72.93 ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49 Uname: Linux 4.4.0-72-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia ApportVersion: 2.20.1-0ubuntu2.5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: julien 2843 F.... pulseaudio /dev/snd/controlC0: julien 2843 F.... pulseaudio CurrentDesktop: GNOME Date: Sun Apr 23 14:49:21 2017 HibernationDevice: RESUME=UUID=9538fd33-c1e1-4565-8418-b1c064fbb75a InstallationDate: Installed on 2016-05-14 (343 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) IwConfig: enp2s0 no wireless extensions. lo no wireless extensions. MachineType: Gigabyte Technology Co., Ltd. P55-UD6 ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-72-generic root=UUID=8377aff6-556d-4821-b5d9-0851faec7c24 ro quiet splash RelatedPackageVersions: linux-restricted-modules-4.4.0-72-generic N/A linux-backports-modules-4.4.0-72-generic N/A linux-firmware 1.157.8 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 06/30/2010 dmi.bios.vendor: Award Software International, Inc. dmi.bios.version: F10 dmi.board.name: P55-UD6 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF10:bd06/30/2010:svnGigabyteTechnologyCo.,Ltd.:pnP55-UD6:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP55-UD6:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr: dmi.product.name: P55-UD6 dmi.sys.vendor: Gigabyte Technology Co., Ltd. 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