I`ve tested kernel from: https://kernel.ubuntu.com/~cking/lp1827884/, the problems seems to be fixed, but what about kernel version 4.15.0?
-- 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/1827884 Title: x86: mm: early boot problem on i386 with KPTI enabled Status in linux package in Ubuntu: Confirmed Status in linux source package in Xenial: Confirmed Status in linux source package in Bionic: Fix Committed Bug description: [Impact] Commit d653420532d580156c8486686899ea6a9eeb7bf0 in bionic enabled kernel page table isolation for x86_32, but also introduced regressions. One of them ("BUG_ON() condition in vmalloc_sync_one()") has been addressed by bug 1830433, but there are other issues reported on i386. Specifically on some i386 systems the kernel seems to fail in the early stage of boot (black screen and frozen keyboard) with no error reported on the console. If the kernel is booted with "mitigations=off" and "nopti" the problem doesn't happen (that is a clear indication of being a kernel page table isolation issue). However, users have been reported positive results with the following upstream fixes applied (all clean cherry picks), even with mitigations *and* kernel page table isolation enabled. [Test Case] Unfortuantely this problem is not easily reproducible, the kernel simply fails to boot (black screen and frozen keyboard) after the GRUB prompt, so we don't have a real test case (except asking the bug reporters to boot the kernel and see if it works). [Fix] The following upstream fix seems to resolve (prevent) the problem: 1d8ca3be86ebc6a38dad8236f45c7a9c61681e78 x86/mm/fault: Allow stack access below %rsp aa37c51b9421d66f7931c5fdcb9ce80c450974be x86/mm: Break out user address space handling 8fed62000039058adfd8b663344e2f448aed1e7a x86/mm: Break out kernel address space handling 164477c2331be75d9bd57fb76704e676b2bcd1cd x86/mm: Clarify hardware vs. software "error_code" 0e664eee65337082be49fbbd2ee24aa0d111d0f2 Revert "perf/core: Make sure the ring-buffer is mapped in all page-tables" [Regression Potential] All upstream fixes, tested on the affected platform, backport changes are minimal. [Original bug report] NOTE: Boot problems on TWO different laptops after Software Updater updated to kernel 4.15.0-48 Both laptops running Ubuntu 18.04.2LTS i386/32bit with Xubuntu desktop. Both fresh installs from minimal CD in early April, originally kernel 0.4.15.0-47, both working fine. Bug report filed on THIS MACHINE: HP Compag 6710b, Intel Core2 Duo T7100 @ 1.8GHz, RAM 4GB, with Intel integrated graphics controller GM965/GL960 (with kernel command line parameter ¨video=SVIDEO-1:d¨) SYMPTOM: 4.15.0-48 requires a second ´recovery´ boot to get it up and running. Will not boot properly after a normal shutdown - screen goes funny and it hangs Does boot successfully after a hard shutdown - detects improper shutdown, loads grub menu, then boot successfully Boot problem appeared after update from kernel version 4.15.0-47 to 4.15.0-48 Problem occurs in 4.15.0-48 kernel, but not in 4.15.0-47 (which still boots normally after a normal shutdown) OTHER MACHINE: Even older!!! ASUS W1N Pentium M banias 1.7gHz, 1.5GB RAM, ATI Mobility Radeon 9600 GPU. Running with command line parameter "forcepae". SYMPTOM: Won't boot at all. Was working fine under 4.15.0-47 as originally installed, until software updater installed 4.15.0-48. Now it won't boot (hangs, black screen), and I can't even get into the grub menu to try the older kernel. More Info on what I've already tried for troubleshooting (on the HP6710b) is outlined in https://answers.launchpad.net/ubuntu/+question/680486 Happy to provide more info if needed, but I'm just an end user user and new to Linux, so will be on a learning curve at this end. (and apologies in advance if this a user problem, and not an actual bug). Thanks ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-48-generic 4.15.0-48.51 ProcVersionSignature: Ubuntu 4.15.0-48.51-generic 4.15.18 Uname: Linux 4.15.0-48-generic i686 ApportVersion: 2.20.9-0ubuntu7.6 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: michael 1681 F.... pulseaudio CurrentDesktop: XFCE Date: Mon May 6 21:16:34 2019 MachineType: Hewlett-Packard HP Compaq 6710b PccardctlIdent: Socket 0: no product info available PccardctlStatus: Socket 0: no card ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-48-generic root=UUID=1f4f1f23-b034-4931-af71-c51eba39fbd3 ro video=SVIDEO-1:d RelatedPackageVersions: linux-restricted-modules-4.15.0-48-generic N/A linux-backports-modules-4.15.0-48-generic N/A linux-firmware 1.173.5 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/18/2008 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: 68DDU Ver. F.13 dmi.board.name: 30C0 dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 71.2E dmi.chassis.asset.tag: SGH8080272 dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvr68DDUVer.F.13:bd08/18/2008:svnHewlett-Packard:pnHPCompaq6710b:pvrF.13:rvnHewlett-Packard:rn30C0:rvrKBCVersion71.2E:cvnHewlett-Packard:ct10:cvr: dmi.product.family: 103C_5336AN dmi.product.name: HP Compaq 6710b dmi.product.version: F.13 dmi.sys.vendor: Hewlett-Packard --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.6 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: michael 1034 F.... pulseaudio /dev/snd/controlC0: michael 1034 F.... pulseaudio CurrentDesktop: XFCE DistroRelease: Ubuntu 18.04 Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 002: ID 046d:c00f Logitech, Inc. MouseMan Traveler/Mobile Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: ASUSTeK Computer Inc. W1N Package: linux (not installed) PccardctlIdent: Socket 0: no product info available Socket 1: no product info available PccardctlStatus: Socket 0: no card Socket 1: no card ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-48-generic root=UUID=5e6f46b1-73a8-4779-bc20-414a46286723 ro forcepae quiet splash ProcVersionSignature: Ubuntu 4.15.0-48.51-generic 4.15.18 RelatedPackageVersions: linux-restricted-modules-4.15.0-48-generic N/A linux-backports-modules-4.15.0-48-generic N/A linux-firmware 1.173.5 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no Tags: bionic Uname: Linux 4.15.0-48-generic i686 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 05/26/2004 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 0203 dmi.board.name: W1N dmi.board.vendor: ASUSTeK Computer Inc. dmi.board.version: 1.0 dmi.chassis.asset.tag: ATN12345678901234567 dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK Computer Inc. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0203:bd05/26/2004:svnASUSTeKComputerInc.:pnW1N:pvr1.0:rvnASUSTeKComputerInc.:rnW1N:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0: dmi.product.name: W1N dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK Computer Inc. --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.6 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: michael 1034 F.... pulseaudio /dev/snd/controlC0: michael 1034 F.... pulseaudio CurrentDesktop: XFCE DistroRelease: Ubuntu 18.04 Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 002: ID 046d:c00f Logitech, Inc. MouseMan Traveler/Mobile Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: ASUSTeK Computer Inc. W1N Package: linux (not installed) PccardctlIdent: Socket 0: no product info available Socket 1: no product info available PccardctlStatus: Socket 0: no card Socket 1: no card ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-48-generic root=UUID=5e6f46b1-73a8-4779-bc20-414a46286723 ro forcepae quiet splash ProcVersionSignature: Ubuntu 4.15.0-48.51-generic 4.15.18 RelatedPackageVersions: linux-restricted-modules-4.15.0-48-generic N/A linux-backports-modules-4.15.0-48-generic N/A linux-firmware 1.173.5 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no Tags: bionic Uname: Linux 4.15.0-48-generic i686 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 05/26/2004 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 0203 dmi.board.name: W1N dmi.board.vendor: ASUSTeK Computer Inc. dmi.board.version: 1.0 dmi.chassis.asset.tag: ATN12345678901234567 dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK Computer Inc. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0203:bd05/26/2004:svnASUSTeKComputerInc.:pnW1N:pvr1.0:rvnASUSTeKComputerInc.:rnW1N:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0: dmi.product.name: W1N dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK Computer Inc. 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