[Touch-packages] [Bug 1755232] Re: Xorg crashes when tapping Unity system tray icons
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1755232 Title: Xorg crashes when tapping Unity system tray icons Status in xorg-server package in Ubuntu: In Progress Bug description: 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= 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:
[Touch-packages] [Bug 1755232] Re: Xorg crashes when tapping Unity system tray icons
This is fixed in https://gitlab.freedesktop.org/xorg/xserver/commit/35e5a76cc1d02801fadd49d12e60664b02e4bebc Will be in next xorg revision (if not cherry-picked earlier) ** Changed in: xorg (Ubuntu) Status: New => In Progress ** Changed in: xorg (Ubuntu) Importance: Undecided => Medium ** Changed in: xorg (Ubuntu) Assignee: (unassigned) => Timo Aaltonen (tjaalton) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1755232 Title: Xorg crashes when tapping Unity system tray icons Status in xorg package in Ubuntu: In Progress Bug description: 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= 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
[Touch-packages] [Bug 1755232] Re: Xorg crashes when tapping Unity system tray icons
@jnavila: It looks like it could be related, but I couldn't reproduce your crash (or at least I think so). With context menu opened in chrome I tried tapping on the window border, Unity bar and system tray - both when Chrome was maximized and when it wasn't. No crash. Should I do something else? -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1755232 Title: Xorg crashes when tapping Unity system tray icons Status in xorg package in Ubuntu: New Bug description: 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= 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:
[Touch-packages] [Bug 1755232] Re: Xorg crashes when tapping Unity system tray icons
Maybe something similar to what I experience. See https://bugs.freedesktop.org/show_bug.cgi?id=105557 ** Bug watch added: freedesktop.org Bugzilla #105557 https://bugs.freedesktop.org/show_bug.cgi?id=105557 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1755232 Title: Xorg crashes when tapping Unity system tray icons Status in xorg package in Ubuntu: New Bug description: 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= 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
[Touch-packages] [Bug 1755232] Re: Xorg crashes when tapping Unity system tray icons
I tried adding critical section to DeactivatePointerGrab. Xorg was working, including multitouch. After some time, when I touched the screen (single finger) it deadlocked. So it really looks like a multithreading issue. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1755232 Title: Xorg crashes when tapping Unity system tray icons Status in xorg package in Ubuntu: New Bug description: 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= 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:
