** Description changed:
+ [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:
+ 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
+ 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
+ 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
+ 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
+ Socket 0:
+ no product info available
PccardctlStatus:
- Socket 0:
- no card
+ 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
+ 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
+ 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
+ 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
+ Socket 0:
+ no product info available
+ Socket 1:
+ no product info available
PccardctlStatus:
- Socket 0:
- no card
- Socket 1:
- no card
+ 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
+ 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
+ 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
+ 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
+ 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
+ Socket 0:
+ no product info available
+ Socket 1:
+ no product info available
PccardctlStatus:
- Socket 0:
- no card
- Socket 1:
- no card
+ 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
+ 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
+ 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.
** Summary changed:
- Boot problems after upgrade to kernel 4.15.0-48 (18.04.2LTS/i386)
+ x86: mm: early boot problem on i386 with KPTI enabled
--
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https://bugs.launchpad.net/bugs/1827884
Title:
x86: mm: early boot problem on i386 with KPTI enabled
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