| 2023-02-18 11:47:38 |
Mustafa Kemal Gilor |
bug |
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added bug |
| 2023-02-18 11:47:38 |
Mustafa Kemal Gilor |
attachment added |
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xorg.conf https://bugs.launchpad.net/bugs/2007746/+attachment/5648222/+files/xorg.conf |
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| 2023-02-18 11:51:27 |
Mustafa Kemal Gilor |
nominated for series |
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Ubuntu Kinetic |
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| 2023-02-18 11:51:27 |
Mustafa Kemal Gilor |
bug task added |
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xorg-server (Ubuntu Kinetic) |
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| 2023-02-18 11:51:27 |
Mustafa Kemal Gilor |
nominated for series |
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Ubuntu Focal |
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| 2023-02-18 11:51:27 |
Mustafa Kemal Gilor |
bug task added |
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xorg-server (Ubuntu Focal) |
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| 2023-02-18 11:51:27 |
Mustafa Kemal Gilor |
nominated for series |
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Ubuntu Jammy |
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| 2023-02-18 11:51:27 |
Mustafa Kemal Gilor |
bug task added |
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xorg-server (Ubuntu Jammy) |
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| 2023-02-18 11:51:27 |
Mustafa Kemal Gilor |
nominated for series |
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Ubuntu Lunar |
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| 2023-02-18 11:51:27 |
Mustafa Kemal Gilor |
bug task added |
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xorg-server (Ubuntu Lunar) |
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| 2023-02-18 11:51:27 |
Mustafa Kemal Gilor |
nominated for series |
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Ubuntu Bionic |
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| 2023-02-18 11:51:27 |
Mustafa Kemal Gilor |
bug task added |
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xorg-server (Ubuntu Bionic) |
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| 2023-02-18 11:53:16 |
Mustafa Kemal Gilor |
bug task deleted |
xorg-server (Ubuntu Bionic) |
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| 2023-02-18 11:53:21 |
Mustafa Kemal Gilor |
bug task deleted |
xorg-server (Ubuntu Jammy) |
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| 2023-02-18 11:53:25 |
Mustafa Kemal Gilor |
bug task deleted |
xorg-server (Ubuntu Kinetic) |
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| 2023-02-18 11:53:29 |
Mustafa Kemal Gilor |
bug task deleted |
xorg-server (Ubuntu Lunar) |
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| 2023-02-18 11:53:36 |
Mustafa Kemal Gilor |
xorg-server (Ubuntu Focal): status |
New |
In Progress |
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| 2023-02-18 11:53:38 |
Mustafa Kemal Gilor |
xorg-server (Ubuntu Focal): assignee |
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Mustafa Kemal Gilor (mustafakemalgilor) |
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| 2023-02-18 12:48:37 |
Mustafa Kemal Gilor |
bug |
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added subscriber SE SRU ("STS") Sponsors |
| 2023-02-18 13:07:36 |
Launchpad Janitor |
merge proposal linked |
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https://code.launchpad.net/~mustafakemalgilor/ubuntu/+source/xorg-server/+git/xorg-server/+merge/437541 |
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| 2023-02-18 13:18:20 |
Mustafa Kemal Gilor |
description |
[ Impact ]
* Microsoft Azure NV-series instances with NVidia GRID drivers started to experience xserver crashes while following Microsoft's official guide to installing Nvidia drivers [1].
* Root cause analysis showed that it was due to having a device with BusID "PCI:0@<domain_id>:0:0", where domain id is >= 32767 while the hyperv_drm kernel module is loaded.
* Removing either the BusID specification or unloading the hyperv_drm kernel module seems to fix the crash.
* The crash is happening while X.server is trying to enumerate PCI devices. X.server dereferences a NULL pointer while trying to access to the PCI device info.
* The reason why it only happens while the hyperv_drm kernel module is loaded is that the hyperv_drm module does not expose PCI hardware information since it's a virtual device.
* The upstream patch [2] addresses the issue and it's confirmed that the xserver with the patch does not experience the crash.
* Ubuntu Focal `xorg-server` package does not include the patch [2] at the moment (xserver-xorg-core=2:1.20.13-1ubuntu1~20.04.6).
[1]: https://learn.microsoft.com/en-us/azure/virtual-machines/linux/n-series-driver-setup#install-grid-drivers-on-nv-or-nvv3-series-vms
[2]: https://github.com/freedesktop/xorg-xserver/commit/0d93bbfa2cfacbb73741f8bed0e32fa1a656b928
[ Test Plan ]
Part (a) is quoted from Microsoft's official guide [1].
Part (a):
* Spawn a Microsoft Azure NV-series instance with an NVidia GRID-supported GPU
- e.g. `NV36adms A10`
* Install updates, required tooling, and the desktop environment:
- sudo apt-get update
- sudo apt-get upgrade -y
- sudo apt-get dist-upgrade -y
- sudo apt-get install build-essential ubuntu-desktop -y
- sudo apt-get install linux-azure -y
* Disable nouveau kernel driver:
# Create a blacklist file /etc/modprobe.d/nouveau.conf with following contents:
blacklist nouveau
blacklist lbm-nouveau
* Reboot the VM, re-connect, and then stop X server:
- sudo reboot
# wait for the reboot, reconnect, and continue:
- sudo systemctl stop lightdm.service
* Download and install the NVidia GRID driver:
- wget -O NVIDIA-Linux-x86_64-grid.run https://go.microsoft.com/fwlink/?linkid=874272
- chmod +x NVIDIA-Linux-x86_64-grid.run
- sudo ./NVIDIA-Linux-x86_64-grid.run
- # When the setup asks whether you want to run the nvidia-xconfig utility to update your X configuration file, select Yes.
* Copy /etc/nvidia/gridd.conf.template to /etc/nvidia/gridd.conf
- sudo cp /etc/nvidia/gridd.conf.template /etc/nvidia/gridd.conf
* Edit /etc/nvidia/grid.conf
- sudo nano /etc/nvidia/grid.conf
# Append the following lines:
IgnoreSP=FALSE
EnableUI=FALSE
# Remove this line if present:
FeatureType=0
# And save.
* Reboot the VM
Part (b):
* Ensure that the hyperv_drm kernel module is loaded:
- sudo modprobe hyperv_drm
* Use the attached xorg.conf file to override /etc/X11/xorg.conf file
* try to start the `xserver`:
- sudo startx
* `xserver` should crash with a similar output to the following:
X.Org X Server 1.20.13
X Protocol Version 11, Revision 0
Build Operating System: linux Ubuntu
Current Operating System: Linux a10test 5.15.0-1031-azure #38~20.04.1-Ubuntu SMP Mon Jan 9 18:23:48 UTC 2023 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.15.0-1031-azure root=PARTUUID=4cac852b-afba-447b-b3e7-c002155c1305 ro console=tty1 console=ttyS0 earlyprintk=ttyS0 panic=-1
Build Date: 07 February 2023 12:48:13PM
xorg-server 2:1.20.13-1ubuntu1~20.04.6 (For technical support please see http://www.ubuntu.com/support)
Current version of pixman: 0.38.4
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.1.log", Time: Sat Feb 18 10:54:26 2023
(==) Using config file: "/etc/X11/xorg.conf"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
(EE)
(EE) Backtrace:
(EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x13c) [0x55e7787c5ecc]
(EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x60) [0x7f9576cac420]
(EE) 2: /usr/lib/xorg/Xorg (xf86PlatformDeviceCheckBusID+0xa7) [0x55e7786c4db7]
(EE) 3: /usr/lib/xorg/Xorg (xf86PlatformMatchDriver+0x700) [0x55e7786bf1b0]
(EE) 4: /usr/lib/xorg/Xorg (xf86CallDriverProbe+0x5c) [0x55e7786971dc]
(EE) 5: /usr/lib/xorg/Xorg (xf86BusConfig+0x43) [0x55e778697b23]
(EE) 6: /usr/lib/xorg/Xorg (InitOutput+0x90b) [0x55e7786a59eb]
(EE) 7: /usr/lib/xorg/Xorg (InitFonts+0x1d4) [0x55e778667ea4]
(EE) 8: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0x7f9576ac8083]
(EE) 9: /usr/lib/xorg/Xorg (_start+0x2e) [0x55e778651ace]
(EE)
(EE) Segmentation fault at address 0x124
(EE)
Fatal server error:
(EE) Caught signal 11 (Segmentation fault). Server aborting
(EE)
(EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
(EE) Please also check the log file at "/var/log/Xorg.1.log" for additional information.
(EE)
(EE) Server terminated with error (1). Closing log file.
^Cxinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: unexpected signal 2
[ Where problems could occur ]
* The regression risk is low, given that the patch is well-isolated and basically adds a null check that is already assumed to be there in the first place.
[ Other Info ]
* workaround #1: unload hyperv_drm kernel module:
- sudo modprobe -r hyperv_drm
* workaround #2: Comment out BusID line in /etc/X11/xorg.conf [Device] section:
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
# BusID "PCI:0@32828:0:0"
Option "HardDPMS" "false"
Option "CustomEDID" "DFP-0:/etc/X11/vdisplay.edid"
EndSection |
[ Impact ]
* Microsoft Azure NV-series instances with NVidia GRID drivers started to experience xserver crashes while following Microsoft's official guide to installing Nvidia drivers [1].
* Root cause analysis showed that it was due to having a device with BusID "PCI:0@<domain_id>:0:0", where domain id is >= 32767 while the hyperv_drm kernel module is loaded.
* Removing either the BusID specification or unloading the hyperv_drm kernel module seems to fix the crash.
* The crash is happening while X.server is trying to enumerate PCI devices. X.server dereferences a NULL pointer while trying to access to the PCI device info.
* The reason why it only happens while the hyperv_drm kernel module is loaded is that the hyperv_drm module does not expose PCI hardware information since it's a virtual device.
* The upstream patch [2] addresses the issue and it's confirmed that the xserver with the patch does not experience the crash.
* Ubuntu Focal `xorg-server` package does not include the patch [2] at the moment (xserver-xorg-core=2:1.20.13-1ubuntu1~20.04.6).
[1]: https://learn.microsoft.com/en-us/azure/virtual-machines/linux/n-series-driver-setup#install-grid-drivers-on-nv-or-nvv3-series-vms
[2]: https://github.com/freedesktop/xorg-xserver/commit/0d93bbfa2cfacbb73741f8bed0e32fa1a656b928
[ Test Plan ]
Part (a) is quoted from Microsoft's official guide [1].
Part (a):
* Spawn a Microsoft Azure NV-series instance with an NVidia GRID-supported GPU
- e.g. `NV36adms A10`
* Install updates, required tooling, and the desktop environment:
- sudo apt-get update
- sudo apt-get upgrade -y
- sudo apt-get dist-upgrade -y
- sudo apt-get install build-essential ubuntu-desktop -y
- sudo apt-get install linux-azure -y
* Disable nouveau kernel driver:
# Create a blacklist file /etc/modprobe.d/nouveau.conf with following contents:
blacklist nouveau
blacklist lbm-nouveau
* Reboot the VM, re-connect, and then stop X server:
- sudo reboot
# wait for the reboot, reconnect, and continue:
- sudo systemctl stop lightdm.service
* Download and install the NVidia GRID driver:
- wget -O NVIDIA-Linux-x86_64-grid.run https://go.microsoft.com/fwlink/?linkid=874272
- chmod +x NVIDIA-Linux-x86_64-grid.run
- sudo ./NVIDIA-Linux-x86_64-grid.run
- # When the setup asks whether you want to run the nvidia-xconfig utility to update your X configuration file, select Yes.
* Copy /etc/nvidia/gridd.conf.template to /etc/nvidia/gridd.conf
- sudo cp /etc/nvidia/gridd.conf.template /etc/nvidia/gridd.conf
* Edit /etc/nvidia/grid.conf
- sudo nano /etc/nvidia/grid.conf
# Append the following lines:
IgnoreSP=FALSE
EnableUI=FALSE
# Remove this line if present:
FeatureType=0
# And save.
* Reboot the VM
Part (b):
* Ensure that the hyperv_drm kernel module is loaded:
- sudo modprobe hyperv_drm
* Use the attached xorg.conf file to override /etc/X11/xorg.conf file
* try to start the `xserver`:
- sudo startx
* `xserver` should crash with a similar output to the following:
X.Org X Server 1.20.13
X Protocol Version 11, Revision 0
Build Operating System: linux Ubuntu
Current Operating System: Linux a10test 5.15.0-1031-azure #38~20.04.1-Ubuntu SMP Mon Jan 9 18:23:48 UTC 2023 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.15.0-1031-azure root=PARTUUID=4cac852b-afba-447b-b3e7-c002155c1305 ro console=tty1 console=ttyS0 earlyprintk=ttyS0 panic=-1
Build Date: 07 February 2023 12:48:13PM
xorg-server 2:1.20.13-1ubuntu1~20.04.6 (For technical support please see http://www.ubuntu.com/support)
Current version of pixman: 0.38.4
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.1.log", Time: Sat Feb 18 10:54:26 2023
(==) Using config file: "/etc/X11/xorg.conf"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
(EE)
(EE) Backtrace:
(EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x13c) [0x55e7787c5ecc]
(EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x60) [0x7f9576cac420]
(EE) 2: /usr/lib/xorg/Xorg (xf86PlatformDeviceCheckBusID+0xa7) [0x55e7786c4db7]
(EE) 3: /usr/lib/xorg/Xorg (xf86PlatformMatchDriver+0x700) [0x55e7786bf1b0]
(EE) 4: /usr/lib/xorg/Xorg (xf86CallDriverProbe+0x5c) [0x55e7786971dc]
(EE) 5: /usr/lib/xorg/Xorg (xf86BusConfig+0x43) [0x55e778697b23]
(EE) 6: /usr/lib/xorg/Xorg (InitOutput+0x90b) [0x55e7786a59eb]
(EE) 7: /usr/lib/xorg/Xorg (InitFonts+0x1d4) [0x55e778667ea4]
(EE) 8: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0x7f9576ac8083]
(EE) 9: /usr/lib/xorg/Xorg (_start+0x2e) [0x55e778651ace]
(EE)
(EE) Segmentation fault at address 0x124
(EE)
Fatal server error:
(EE) Caught signal 11 (Segmentation fault). Server aborting
(EE)
(EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
(EE) Please also check the log file at "/var/log/Xorg.1.log" for additional information.
(EE)
(EE) Server terminated with error (1). Closing log file.
^Cxinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: unexpected signal 2
# To verify patch fixes the issue:
* Enable the following PPA that includes the fix:
- sudo add-apt-repository ppa:mustafakemalgilor/lp2007746
- sudo apt update
* Install the package
- sudo apt install xserver-xorg-core=2:1.20.13-1ubuntu1~20.04.6ubuntu1
* Try to start xserver:
- sudo startx
* xserver should not crash.
[ Where problems could occur ]
* The regression risk is low, given that the patch is well-isolated and basically adds a null check that is already assumed to be there in the first place.
[ Other Info ]
* workaround #1: unload hyperv_drm kernel module:
- sudo modprobe -r hyperv_drm
* workaround #2: Comment out BusID line in /etc/X11/xorg.conf [Device] section:
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
# BusID "PCI:0@32828:0:0"
Option "HardDPMS" "false"
Option "CustomEDID" "DFP-0:/etc/X11/vdisplay.edid"
EndSection |
|
| 2023-02-20 05:26:18 |
Daniel van Vugt |
tags |
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focal |
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| 2023-02-20 05:26:23 |
Daniel van Vugt |
xorg-server (Ubuntu): status |
New |
Fix Released |
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| 2023-02-20 05:26:29 |
Daniel van Vugt |
bug |
|
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added subscriber Daniel van Vugt |
| 2023-03-01 15:33:46 |
Dariusz Gadomski |
tags |
focal |
focal se-sponsor-dgadomski |
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| 2023-03-02 16:27:08 |
Dariusz Gadomski |
bug |
|
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added subscriber Dariusz Gadomski |
| 2023-03-15 11:21:04 |
Dariusz Gadomski |
bug |
|
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added subscriber Ubuntu Sponsors Team |
| 2023-03-15 11:21:08 |
Dariusz Gadomski |
removed subscriber Ubuntu Sponsors Team |
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| 2023-03-15 15:22:39 |
Dariusz Gadomski |
tags |
focal se-sponsor-dgadomski |
focal se se-sponsor-dgadomski sts |
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| 2023-03-29 07:16:14 |
Chris Halse Rogers |
xorg-server (Ubuntu Focal): status |
In Progress |
Fix Committed |
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| 2023-03-29 07:16:16 |
Chris Halse Rogers |
bug |
|
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added subscriber Ubuntu Stable Release Updates Team |
| 2023-03-29 07:16:18 |
Chris Halse Rogers |
bug |
|
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added subscriber SRU Verification |
| 2023-03-29 07:16:23 |
Chris Halse Rogers |
tags |
focal se se-sponsor-dgadomski sts |
focal se se-sponsor-dgadomski sts verification-needed verification-needed-focal |
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| 2023-03-29 12:50:01 |
Mustafa Kemal Gilor |
tags |
focal se se-sponsor-dgadomski sts verification-needed verification-needed-focal |
focal se se-sponsor-dgadomski sts verification-done-focal |
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| 2023-03-29 18:08:18 |
Launchpad Janitor |
xorg-server (Ubuntu Focal): status |
Fix Committed |
Fix Released |
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| 2023-03-29 18:08:18 |
Launchpad Janitor |
cve linked |
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2023-1393 |
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