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Since upgrading to Ubuntu 21.04 yesterday, I've noticed several hangs
during full-screen video playback (watching Youtube videos in Chromium).
Often, it happens just after or during the switch to full-screen.
The system stays running and I can connect via ssh, but restarting gdm3
has no effect and most of the time I've had to reboot. The latest hang
recovered automatically when I left the machine alone for about 2
minutes, and produced the following messages in dmesg (I'll attach a
more complete log):
```
[ 3520.856803] [TTM] Buffer eviction failed
[ 3520.856856] ------------[ cut here ]------------
[ 3520.856859] refcount_t: underflow; use-after-free.
[ 3520.856888] WARNING: CPU: 3 PID: 6842 at lib/refcount.c:28
refcount_warn_saturate+0xae/0xf0
...
[ 3520.857292] Call Trace:
[ 3520.857305] ttm_bo_put+0x3f/0x50 [ttm]
[ 3520.857331] nouveau_gem_new+0xc4/0x100 [nouveau]
[ 3520.857611] ? nouveau_gem_new+0x100/0x100 [nouveau]
[ 3520.857871] nouveau_gem_ioctl_new+0x5b/0x100 [nouveau]
[ 3520.858133] ? nouveau_gem_new+0x100/0x100 [nouveau]
[ 3520.858398] drm_ioctl_kernel+0xae/0xf0 [drm]
[ 3520.858500] drm_ioctl+0x245/0x400 [drm]
[ 3520.858586] ? nouveau_gem_new+0x100/0x100 [nouveau]
[ 3520.858850] ? __fget_files+0x5f/0x90
[ 3520.858864] ? __fget_light+0x32/0x80
[ 3520.858879] nouveau_drm_ioctl+0x66/0xc0 [nouveau]
[ 3520.859145] __x64_sys_ioctl+0x91/0xc0
[ 3520.859158] do_syscall_64+0x38/0x90
[ 3520.859170] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 3520.859182] RIP: 0033:0x7fce8ceb0317
```
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: xorg 1:7.7+22ubuntu1
ProcVersionSignature: Ubuntu 5.11.0-31.33-generic 5.11.22
Uname: Linux 5.11.0-31-generic x86_64
NonfreeKernelModules: wl
.tmp.unity_support_test.0:
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
CasperMD5CheckResult: unknown
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Mon Aug 16 23:36:04 2021
DistUpgraded: 2021-08-15 02:10:41,733 DEBUG Running PostInstallScript:
'/usr/lib/ubuntu-advantage/upgrade_lts_contract.py'
DistroCodename: hirsute
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GpuHangFrequency: Several times a day
GpuHangReproducibility: Occurs more often under certain circumstances
GpuHangStarted: Immediately after installing this version of Ubuntu
GraphicsCard:
NVIDIA Corporation GT218M [GeForce 310M] [10de:0a70] (rev a2) (prog-if 00 [VGA
controller])
Subsystem: Samsung Electronics Co Ltd GT218M [GeForce 310M] [144d:c079]
InstallationDate: Installed on 2014-06-27 (2607 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: SAMSUNG ELECTRONICS CO., LTD. Q430/Q530
ProcEnviron:
LANGUAGE=en_IE:en
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_IE.UTF-8
SHELL=/usr/bin/zsh
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-31-generic
root=UUID=fc20db83-0138-4e0c-b7e9-04da38c1e9e9 ro quiet splash
acpi_backlight=vendor crashkernel=512M-:192M acpi_enforce_resources=lax
crashkernel=512M-:192M vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to hirsute on 2021-08-15 (1 days ago)
dmi.bios.date: 05/29/2010
dmi.bios.release: 2.0
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 02KF.M008.20100529.KSJ
dmi.board.asset.tag: Tag 12345
dmi.board.name: Q430/Q530
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias:
dmi:bvnPhoenixTechnologiesLtd.:bvr02KF.M008.20100529.KSJ:bd05/29/2010:br2.0:svnSAMSUNGELECTRONICSCO.,LTD.:pnQ430/Q530:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnQ430/Q530:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: Q430/Q530
dmi.product.version: Not Applicable
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
version.compiz: compiz 1:0.9.14.1+20.10.20200813-0ubuntu4
version.libdrm2: libdrm2 2.4.105-3~21.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.3-0ubuntu0.2
version.libgl1-mesa-glx: libgl1-mesa-glx 21.0.3-0ubuntu0.2
version.xserver-xorg-core: xserver-xorg-core 2:1.20.11-1ubuntu1.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.6-2build1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-2
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20200714-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-1
xserver.bootTime: Sat Aug 14 22:37:51 2021
xserver.configfile: default
xserver.errors:
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
xserver.version: 2:1.20.11-1ubuntu1~20.04.2
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug freeze hirsute third-party-packages ubuntu
wayland-session
--
Xorg freeze (nouveau/ttm use-after-free with full-screen video)
https://bugs.launchpad.net/bugs/1940154
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