/proc/sys/abi/ldt16 does not exist

[1448412]

Hi,

I guess I stumbled upon a VERY old problem;

I can't make some of my windows-programs work, despite they have a gold rating in wine.

Some old Windows binaries that include 16-Bit Code need the kernel to have echo 1 >> /proc/sys/abi/ldt16 enabled, but that pseudo-file does not exist on my 16.04 Ubuntu system.

root@Johnnyfive:~# echo 1 >> /proc/sys/abi/ldt16
-bash: /proc/sys/abi/ldt16: Datei oder Verzeichnis nicht gefunden
root@Johnnyfive:~# ls /proc/sys/abi/
vsyscall32

The issue is discussed in lots of places:
--> https://lkml.org/lkml/2014/5/7/508
--> https://forum.winehq.org/viewtopic.php?f=8&t=22700
--> http://ubuntuforums.org/archive/index.php/t-2228133.html

The issue seems to be a very old regression, a bug on this was filed and closed in 2014.
--> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1328965

So I think that this is a very old and annoying regression that just wont stop
keep coming back. Could you please include the fix once and for all?

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-21-generic 4.4.0-21.37
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ulrich 1816 F.... pulseaudio
CurrentDesktop: LXDE
Date: Sat May 7 12:36:44 2016
HibernationDevice: RESUME=UUID=93df4898-fb0b-4278-ade1-ccfffb092022
InstallationDate: Installed on 2016-04-02 (35 days ago)
InstallationMedia: Lubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
IwConfig:
 enp2s0 no wireless extensions.

 enp3s0 no wireless extensions.

 lo no wireless extensions.
MachineType: Shuttle Inc. SX58
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic root=/dev/mapper/fivegroup-root ro quiet splash
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-21-generic N/A
 linux-backports-modules-4.4.0-21-generic N/A
 linux-firmware 1.157
RfKill:

SourcePackage: linux
UpgradeStatus: Upgraded to xenial on 2016-04-25 (12 days ago)
dmi.bios.date: 03/02/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080016
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: SX58
dmi.board.vendor: Shuttle Inc.
dmi.board.version: V10
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Intel
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080016:bd03/02/2010:svnShuttleInc.:pnSX58:pvrV10:rvnShuttleInc.:rnSX58:rvrV10:cvnIntel:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: SX58
dmi.product.version: V10
dmi.sys.vendor: Shuttle Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.6 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc7-wily/

[1448412 (uli-rgbg)]

Hi,

thanks for your response!

I tested

linux-image-4.6.0-040600rc7-generic_4.6.0-040600rc7.201605120803_amd64

=> it also lacks /proc/sys/abi/ldt16.

[penalvch (penalvch)]

1448412, while doing some research towards this I noticed:
cat /boot/config-4.4.0-22-generic | grep CONFIG_X86_ESPFIX64
CONFIG_X86_ESPFIX64=y

cat /boot/config-4.4.0-22-generic | grep 16B
CONFIG_X86_16BIT=y

cat /boot/config-4.4.0-22-generic | grep CONFIG_X86_64=
CONFIG_X86_64=y

So, it appears the proper configuration and its dependencies are in place for 16-bit support.

Also, from my read of it, one has to make some manual modifications to the WINE environment (ex. adjust WINE prefix to 32-bit from default 64-bit when in a 64-bit host OS, and ensuring the Windows version set is a legacy one like Windows XP).

Could you please advise?

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]