Xorg becomes unresponsive occasionally when system is under heavy load: BUG: triggered 'if (listener >= ti->num_listeners)'

[Daniel McFeeters]

It seems that (almost daily) my system will "freeze" requiring a hard power-off. I presume the problem is in the X server, as it simply stops responding to keyboard / mouse inputs. It seems to happen when the system is under heavy load.

I found these lines in the X log, which may be relevant to the issue:

[140075.416] (EE) client bug: timer event7 keyboard: scheduled expiry is in the past (-471ms), your system is too slow
[140808.222] (EE) BUG: triggered 'if (listener >= ti->num_listeners)'
[140808.222] (EE) BUG: ../../../../dix/touch.c:1000 in TouchListenerAcceptReject()
[140808.227] (EE)
[140808.227] (EE) Backtrace:
[140808.235] (EE) 0: /usr/lib/xorg/Xorg (SwapShorts+0x1ba4) [0x55d22e503464]
[140808.236] (EE) 1: /usr/lib/xorg/Xorg (InitProximityClassDeviceStruct+0x2863) [0x55d22e5c63c3]
[140808.236] (EE) 2: /usr/lib/xorg/Xorg (XkbProcessKeyboardEvent+0x3b5) [0x55d22e5edd25]
[140808.237] (EE) 3: /usr/lib/xorg/Xorg (mieqProcessDeviceEvent+0x1f5) [0x55d22e6194f5]
[140808.237] (EE) 4: /usr/lib/xorg/Xorg (mieqProcessInputEvents+0x99) [0x55d22e619609]
[140808.237] (EE) 5: /usr/lib/xorg/Xorg (ProcessInputEvents+0x1d) [0x55d22e51665d]
[140808.238] (EE) 6: /usr/lib/xorg/Xorg (SendErrorToClient+0x103) [0x55d22e4d8cf3]
[140808.238] (EE) 7: /usr/lib/xorg/Xorg (InitFonts+0x3b4) [0x55d22e4dcfd4]
[140808.240] (EE) 8: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0x7feb5006b0b3]
[140808.241] (EE) 9: /usr/lib/xorg/Xorg (_start+0x2e) [0x55d22e4c6a3e]
[140808.241] (EE)

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
ApportVersion: 2.20.11-0ubuntu25
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: Budgie:GNOME
Date: Thu Apr 9 11:58:34 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller [8086:22b1] (rev 35) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller [103c:832c]
InstallationDate: Installed on 2020-03-31 (8 days ago)
InstallationMedia: Ubuntu-Budgie 20.04 LTS "Focal Fossa" - Alpha amd64 (20200329)
MachineType: HP HP Laptop 15-bs0xx
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic root=/dev/mapper/hplaptop-root ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/30/2018
dmi.bios.vendor: Insyde
dmi.bios.version: F.36
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 832C
dmi.board.vendor: HP
dmi.board.version: 25.26
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.36:bd03/30/2018:svnHP:pnHPLaptop15-bs0xx:pvrType1ProductConfigId:rvnHP:rn832C:rvr25.26:cvnHP:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV HP Notebook
dmi.product.name: HP Laptop 15-bs0xx
dmi.product.sku: 2DV78UA#ABA
dmi.product.version: Type1ProductConfigId
dmi.sys.vendor: HP
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.100-4
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 20.0.4-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.7-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20190815-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

[Daniel McFeeters (fiforms)]

I had the same crash again this evening, while browsing Facebook with Firefox browser. Here is my Xorg.log.old (after reboot)