Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.15 kernel[0]. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15 ** Changed in: linux (Ubuntu) Importance: Undecided => High ** 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/1746860 Title: CPU soft lockup causing trusty (3.16.0-38-generic) to become unresponsive Status in linux package in Ubuntu: Incomplete Bug description: 1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu Description: Ubuntu 14.04.5 LTS Release: 14.04 2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center linux-image-3.16.0-38-generic 3.16.0-38.52~14.04.1 (ksplice effective version 3.16.0-45-generic) qemu-system 2.0.0+dfsg-2ubuntu1.36 3) What you expected to happen The system should not have crashed 4) What happened instead The system crashed and reported CPU soft lockup errors. Hi, we had a system lock up completely today, we noticed the following in the logs: [84070301.087602] BUG: soft lockup - CPU#1 stuck for 23s! [qemu-system-x86:30908] [84070301.271530] BUG: soft lockup - CPU#8 stuck for 22s! [khugepaged:238] [84070314.314615] INFO: rcu_sched detected stalls on CPUs/tasks: { 0} (detected by 19, t=150024 jiffies, g=8647354832, c=8647354831, q=0) [84070341.072534] BUG: soft lockup - CPU#1 stuck for 22s! [qemu-system-x86:30908] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1746860/+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
