** Tags added: i386 -- 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/1793464
Title: Kernel panic after the ubuntu_nbd_smoke_test on Xenial kernel Status in ubuntu-kernel-tests: New Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: New Bug description: == SRU Justification == When running the Ubuntu nbd autotest regression test we trip a hang and then a little later a panic message. There are two upstream fixes required as this is actually two issues in one. One fix is to not to shutdown the sock when IRQs are disable and a second to fix is to race in the nbd ioctl. == Fix == Upstream commits: 23272a6754b81ff6503e09c743bb4ceeeab39997 nbd: Remove signal usage 1f7b5cf1be4351e60cf8ae7aab976503dd73c5f8 nbd: Timeouts are not user requested disconnects 0e4f0f6f63d3416a9e529d99febfe98545427b81 nbd: Cleanup reset of nbd and bdev after a disconnect c261189862c6f65117eb3b1748622a08ef49c262 nbd: don't shutdown sock with irq's disabled 97240963eb308d8d21a89c0459822f7ea98463b4 nbd: fix race in ioctl The first 3 patches are prerequisites required for the latter two fixes to apply and work correctly. Most of these backports are minor patch wiggles required because later patches have been applied to the driver in earlier fixes to this driver. == Regression Potential == These fixes just touch nbd, so the regression potential is just limited to this. Secondly, we are pulling in upstream fixes that exist in Bionic and Cosmic kernels, so these are tried and tested fixes. == Test Case == 1. Deploy a node with 4.4 Xenial 2. Run the ubuntu_nbd_smoke_test Without the fix, we get hang/crashes. With the fix one can run this test multiple times without any issues at all. ---- This issue can be reproduced on AMD64 KVM //bare-metal node, s390x zKVM node The test itself will pass, but the system will hang after a few second. Steps: 1. Deploy a node with 4.4 Xenial 2. Run the ubuntu_nbd_smoke_test If you have access to the console, you will see that this system actually bumped into a kernel panic: Unable to handle kernel pointer dereference in virtual kernel address space failing address: 000003ff802c1000 TEID: 000003ff802c1803 Fault in home space mode while using kernel ASCE. Log here (s390x KVM): https://pastebin.ubuntu.com/p/dNmtvbGjmz/ ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-136-generic 4.4.0-136.162 ProcVersionSignature: Ubuntu 4.4.0-136.162-generic 4.4.144 Uname: Linux 4.4.0-136-generic s390x NonfreeKernelModules: zfs zunicode zcommon znvpair zavl AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access '/dev/snd/': No such file or directory AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.1-0ubuntu2.18 Architecture: s390x ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. Date: Thu Sep 20 03:46:00 2018 HibernationDevice: RESUME=UUID=ca468a9c-9563-442c-85c6-6055e800a66e IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: PciMultimedia: ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb' ProcKernelCmdLine: root=UUID=b65b756a-ba4e-4c53-aa32-0db2bdb50bb3 crashkernel=196M RelatedPackageVersions: linux-restricted-modules-4.4.0-136-generic N/A linux-backports-modules-4.4.0-136-generic N/A linux-firmware 1.157.20 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1793464/+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