group.of.nepali.translators team mailing list archive

[Juerg Haefliger <1827884@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1838115 ***
    https://bugs.launchpad.net/bugs/1838115

Dima, in comment #75 you mentioned that you experienced issues with
Xenial. What kernel version were you running? We believe this issue is
tied to PTI for 32-bit but that feature was only backported to the 4.15
kernel, not the 4.4. kernel.

** No longer affects: linux (Ubuntu Xenial)

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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 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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