I've only been able to reproduce this on systems with an Intel IOMMU. Disabling the IOMMU in the firmware (usually labelled "VT-d") lets the latest 4.13 i386 kernel boot. It's also reproducible in qemu if you give it an IOMMU, eg. "-machine q35 -device intel-iommu".
The problem is that the IDT page (0xffc00000) overlaps the FIX_BTMAPS range. IOMMU detection tries to read ACPI tables, which eventually calls early_ioremap, which maps an ACPI table over the IDT, and then eventually unmaps it completely. The first kernel interrupt after that (usually in test_wp_bit) triple-faults when it can't find the IDT. I've built an experimental kernel with the FIX_BTMAPS vs IDT conflict fixed at https://people.canonical.com/~wgrant/linux- image-4.13.0-31-generic_4.13.0-31.34~16.04.1_i386.deb. It works on my affected hardware and qemu, but it would be good to confirm that it's the same issue that others have. -- 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/1745118 Title: Unable to boot with i386 4.13.0-25 / 4.13.0-26 / 4.13.0-31 kernel on Xenial / Artful Status in linux package in Ubuntu: Triaged Status in linux source package in Artful: Triaged Bug description: Some SRU testing node cannot boot with the latest 32bit 4.13 linux-hwe kernel. Take node "fozzie"(Dell PowerEdge R320) for example, it works with 4.13.0-21.24~16.04.1 but not 4.13.0-25 / 4.13.0-26 / 4.13.0-31 kernel on Xenial. From the BMC console, I can see the grub menu on boot and after that it will drop into a boot loop. This can be reproduced on Artful 4.13 as well. Note that this kernel works for some of the node in our test pool (Intel SDP - Denlow) ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.13.0-21-generic 4.13.0-21.24~16.04.1 ProcVersionSignature: User Name 4.13.0-21.24~16.04.1-generic 4.13.13 Uname: Linux 4.13.0-21-generic i686 ApportVersion: 2.20.1-0ubuntu2.15 Architecture: i386 Date: Wed Jan 24 08:49:57 2018 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: linux-hwe-edge UpgradeStatus: No upgrade log present (probably fresh install) --- AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Jan 24 09:17 seq crw-rw---- 1 root audio 116, 33 Jan 24 09:17 timer AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.20.1-0ubuntu2.15 Architecture: i386 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: DistroRelease: Ubuntu 16.04 IwConfig: Error: [Errno 2] No such file or directory MachineType: Dell Inc. PowerEdge R320 Package: linux (not installed) PciMultimedia: ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 mgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-21-generic root=UUID=0845f9a0-ab8c-4dfa-8385-af21f2f2b9ad ro ProcVersionSignature: User Name 4.13.0-21.24~16.04.1-generic 4.13.13 RelatedPackageVersions: linux-restricted-modules-4.13.0-21-generic N/A linux-backports-modules-4.13.0-21-generic N/A linux-firmware 1.157.14 RfKill: Error: [Errno 2] No such file or directory Tags: xenial uec-images Uname: Linux 4.13.0-21-generic i686 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm audio cdrom dialout dip floppy lxd netdev plugdev sudo video _MarkForUpload: True dmi.bios.date: 05/11/2012 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.2.4 dmi.board.name: 0DY523 dmi.board.vendor: Dell Inc. dmi.board.version: A03 dmi.chassis.type: 23 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.2.4:bd05/11/2012:svnDellInc.:pnPowerEdgeR320:pvr:rvnDellInc.:rn0DY523:rvrA03:cvnDellInc.:ct23:cvr: dmi.product.name: PowerEdge R320 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1745118/+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
