Shuhao, thank you for reporting this and helping make Ubuntu better. To advised, it notes in comment #2 that it's a bot.
Despite this, could you please test the latest upstream kernel available from the very top line at the top of the page from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D (the release names are irrelevant for testing, and please do not test the daily folder)? Install instructions are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds . This will allow additional upstream developers to examine the issue. If the latest kernel did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this issue is fixed in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the report description: kernel-fixed-upstream kernel-fixed-upstream-X.Y-rcZ Where X, Y, and Z are numbers corresponding to the kernel version. If the mainline kernel does not fix the issue, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-X.Y-rcZ Please note, an error to install the kernel does not fit the criteria of kernel-bug-exists-upstream. Once testing of the latest upstream kernel is complete, please mark this report's Status as Confirmed. Please let us know your results. Thank you for your understanding. ** Tags added: latest-bios-1.46 ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- 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/1509111 Title: Hard lockup but certain UI elements keeps changing Status in linux package in Ubuntu: Incomplete Bug description: I recently upgraded to Wily and I discovered that my system hard freezes about 2-3 times a day. This is the usual: unresponsive keyboard (including magic sysrq), unresponsive USB, no response to pings over the network, music/audio loops, as well as no evidence of errors in syslog, kern.log, Xorg.log. However, there's one very unusual aspect of this lockup: I have an on screen clock to the second and when the lockup occurs, the clock keeps ticking by the second! This means that code must be executing somewhere... This happened all but one occurance of hard freeze, where the clock also froze. In fact, I was on Facebook at one point and saw that I was disconnected. The facebook UI then followed up with the animation of "Reconnecting... 10... 9... 8...". I feel like posting here is a very long shot, but maybe someone else has something similar. Next time this happens I'll try to hook this machine to ethernet to see if there's any response and try to ssh into it. I could also write a program that writes to syslog every 5 seconds and see if those get written when the machine is "locked up". Not sure what else I can do at this point. I can also memtest or play kernel roulette with mainline, but the machine was previously stable on utopic (with BIOS instead of UEFI boot, tho). ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: linux-image-4.2.0-16-generic 4.2.0-16.19 [modified: boot/vmlinuz-4.2.0-16-generic] ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3 Uname: Linux 4.2.0-16-generic x86_64 ApportVersion: 2.19.1-0ubuntu3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: shuhao 1884 F.... pulseaudio CurrentDesktop: XFCE Date: Thu Oct 22 17:49:21 2015 HibernationDevice: RESUME=UUID=0b162d26-cb30-4f74-b80c-6cd03fd55a69 InstallationDate: Installed on 2015-10-14 (8 days ago) InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20151013) MachineType: LENOVO 4180J4C ProcEnviron: LANGUAGE=en_CA:en PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_CA.UTF-8 SHELL=/bin/zsh ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-16-generic.efi.signed root=/dev/mapper/xubuntu--vg-root ro noprompt quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.2.0-16-generic N/A linux-backports-modules-4.2.0-16-generic N/A linux-firmware 1.149 SourcePackage: linux UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/05/2013 dmi.bios.vendor: LENOVO dmi.bios.version: 83ET76WW (1.46 ) dmi.board.asset.tag: Not Available dmi.board.name: 4180J4C dmi.board.vendor: LENOVO dmi.board.version: Not Available dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvr83ET76WW(1.46):bd07/05/2013:svnLENOVO:pn4180J4C:pvrThinkPadT420:rvnLENOVO:rn4180J4C:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 4180J4C dmi.product.version: ThinkPad T420 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1509111/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
