Public bug reported:
This bug requires some prerequisites to reproduce:
0. Make sure you've got multitouch-enable display
1. Start Unity+xorg session
2. Verify that four-finger tap gesture works (shows unity app search tool)
3. Wait some time for this gesture to stop working - this is another bug, not
necessarily xorg one, already known and thought to be connected with Google
Chrome running.
4. Once it stops working, quickly tap all icons in the Unity system tray like
you would be pretending to play a piano (tapping them individually or slowly
does not cause any problems).
5. Xorg crashes immediately.
This scenario is 100% reproducible on my setup.
I recompiled xorg with debug info enabled and got this nice trace:
[ 22705.385] (EE)
[ 22705.385] (EE) Backtrace:
[ 22705.385] (EE) 0: /usr/lib/xorg/Xorg (OsSigHandler+0x3b) [0x562a36b6f25f]
[ 22705.387] (EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (__restore_rt+0x0)
[0x7f382f64414f]
[ 22705.389] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (gsignal+0xcb)
[0x7f382f2880bb]
[ 22705.391] (EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (abort+0x16d)
[0x7f382f289f5d]
[ 22705.393] (EE) 4: /lib/x86_64-linux-gnu/libc.so.6 (__fsetlocking+0x2fd)
[0x7f382f2d22bd]
[ 22705.395] (EE) 5: /lib/x86_64-linux-gnu/libc.so.6 (_IO_str_seekoff+0xa3a)
[0x7f382f2d9f7a]
[ 22705.397] (EE) 6: /lib/x86_64-linux-gnu/libc.so.6 (_IO_str_seekoff+0x2b2e)
[0x7f382f2de0fe]
[ 22705.399] (EE) 7: /lib/x86_64-linux-gnu/libc.so.6 (cfree+0x6e)
[0x7f382f2e044e]
[ 22705.400] (EE) 8: /usr/lib/xorg/Xorg (FreeGrab+0xb8) [0x562a3699ac32]
[ 22705.400] (EE) 9: /usr/lib/xorg/Xorg (DeactivatePointerGrab+0x279)
[0x562a3698428f]
[ 22705.400] (EE) 10: /usr/lib/xorg/Xorg (DeleteWindowFromAnyEvents+0x70)
[0x562a3698ea8b]
[ 22705.401] (EE) 11: /usr/lib/xorg/Xorg (UnrealizeTree+0x100) [0x562a369bc371]
[ 22705.401] (EE) 12: /usr/lib/xorg/Xorg (UnmapWindow+0x195) [0x562a369bc689]
[ 22705.402] (EE) 13: /usr/lib/xorg/Xorg (ProcUnmapWindow+0x74)
[0x562a3696e488]
[ 22705.402] (EE) 14: /usr/lib/xorg/Xorg (Dispatch+0x21e) [0x562a3696d2d9]
[ 22705.402] (EE) 15: /usr/lib/xorg/Xorg (dix_main+0x651) [0x562a3697c4e3]
[ 22705.403] (EE) 16: /usr/lib/xorg/Xorg (main+0x28) [0x562a3695cf22]
[ 22705.405] (EE) 17: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf1)
[0x7f382f2721c1]
[ 22705.405] (EE) 18: /usr/lib/xorg/Xorg (_start+0x2a) [0x562a3695ce1a]
[ 22705.407] (EE) 19: ? (?+0x2a) [0x2a]
Looks like FreeGrab tries to free pGrab for the second time (some
multithreading issue?)
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: xorg 1:7.7+19ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13
Uname: Linux 4.13.0-36-generic x86_64
.tmp.unity_support_test.0:
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity:Unity7:ubuntu
Date: Mon Mar 12 17:03:34 2018
DistroCodename: artful
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
Intel Corporation HD Graphics 620 [8086:5916] (rev 02) (prog-if 00 [VGA
controller])
Subsystem: Lenovo HD Graphics 620 [17aa:2245]
InstallationDate: Installed on 2017-09-01 (192 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
MachineType: LENOVO 20HES2130Q
ProcEnviron:
LANGUAGE=pl_PL
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=pl_PL.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-36-generic.efi.signed
root=/dev/mapper/ubuntu--vg-root ro quiet splash acpi.ec_freeze_events=Y
acpi.ec_suspend_yield=Y intel_pstate=skylake_hwp i915.enable_guc_loading=1
i915.enable_guc_submission=1 vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg crash
UpgradeStatus: Upgraded to artful on 2018-02-11 (29 days ago)
dmi.bios.date: 05/23/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: N1QET55W (1.30 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20HES2130Q
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrN1QET55W(1.30):bd05/23/2017:svnLENOVO:pn20HES2130Q:pvrThinkPadT470:rvnLENOVO:rn20HES2130Q:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T470
dmi.product.name: 20HES2130Q
dmi.product.version: ThinkPad T470
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.13.1+17.10.20170901-0ubuntu1
version.libdrm2: libdrm2 2.4.83-1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.8-0ubuntu0~17.10.1
version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.8-0ubuntu0~17.10.1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20170309-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug artful compiz-0.9 crash ubuntu
** Attachment added: "Xorg log"
https://bugs.launchpad.net/bugs/1755232/+attachment/5077157/+files/Xorg.crash.log.debug
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https://bugs.launchpad.net/bugs/1755232
Title:
Xorg crashes when tapping Unity system tray icons
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