Segfault in libdxcb.so when trying to open Krita on Manjaro/DDE

[Lecraminos]

Issue description

When trying to open Krita in a Deepin Desktop Environment on Manjaro 20.0.1., the application throws a segfault and refuses to start.

Steps to reproduce the issue

1. Open a terminal (zsh in my case)
2. type krita

What's the expected result?

• a running application

What's the actual result?

segmentation fault (core dumped) krita

and in the dmesg log:

traps: krita[212953] general protection fault ip:7f129c74a324 sp:7fff31ef3380 error:0 in libdxcb.so[7f129c73a000+3b000]

Additional details

qmake --version

QMake version 3.1
Using Qt version 5.14.2 in /usr/lib

pacman -Qe krita

krita 4.2.9-2

pacman -Qe deepin-qt5dxcb-plugin

deepin-qt5dxcb-plugin 5.0.11-1

pacman -Qe `pacman -Qg qt | awk '{print $2}'`

qt5-translations 5.14.2-1

pacman -Qe `pacman -Qg deepin | awk '{print $2}'`

deepin-account-faces 1.0.11-1.1
deepin-anything 5.0.1-2
deepin-api 5.1.11.1-1
deepin-calendar 5.6.2-1
deepin-control-center 5.1.0.5-1
deepin-daemon 5.10.0.1-1
deepin-desktop-base 3:2019.07.10-1
deepin-dock 5.1.0.9-1
deepin-file-manager 1:5.1.1.25-1
deepin-gtk-theme 17.10.11-1
deepin-image-viewer 5.6.3.2-1
deepin-launcher 5.1.0099.0-1
deepin-menu 5.0.1-1
deepin-network-utils 5.1.0.0-1
deepin-polkit-agent-ext-gnomekeyring 0.1.0-1
deepin-qt5dxcb-plugin 5.0.11-1
deepin-qt5integration 5.1.0.1-2
deepin-screensaver 0.0.10-1
deepin-session-shell 5.0.0098.0-2
deepin-session-ui 5.1.0099.4-1
deepin-shortcut-viewer 5.0.2-1
deepin-sound-theme 15.10.4-1
deepin-system-monitor 5.6.1-1
deepin-turbo 0.0.3-1
startdde 5.3.0.1-2

[RigoLigoRLC]

I used some debug tricks to try to find out what happened here as I know nothing about debugging a shared library. Seems this is what's happening.

[RigoLigoRLC]

it crashed while doing ->setting. Not sure how that works. Also gdb works after I build it in debug mode.

[RigoLigoRLC]

Two invocations succeeded in the early stage (?) but in the later stage when other threads were created and exited, this function crashed.

The xSettings returned the same thing; maybe the target was deallocated somewhere in the middle of the mess?

[felixonmars]

Still getting the same segfault as of today. I had to remove deepin plugins forcibly to make krita work...

Apr 22 08:23:44 flygon.felixc.at systemd-coredump[502897]: Process 502714 (krita) of user 1000 dumped core.

                                                           Stack trace of thread 502714:
                                                           #0  0x00007f461aa0def5 raise (libc.so.6 + 0x3cef5)
                                                           #1  0x00007f461c739189 _ZN6KCrash19defaultCrashHandlerEi (libKF5Crash.so.5 + 0x4189)
                                                           #2  0x00007f461aa0df80 __restore_rt (libc.so.6 + 0x3cf80)
                                                           #3  0x00007f4614a77908 _ZN22deepin_platform_plugin8DHighDpi10logicalDpiEP10QXcbScreen (libdxcb.so + 0x52908)
                                                           #4  0x00007f461b44f6c2 n/a (libQt5Gui.so.5 + 0x1636c2)
                                                           #5  0x00007f461b3fd9e3 _ZN22QWindowSystemInterface17handleScreenAddedEP15QPlatformScreenb (libQt5Gui.so.5 + 0x1119e3)
                                                           #6  0x00007f46148e48a1 _ZN14QXcbConnection17initializeScreensEv (libQt5XcbQpa.so.5 + 0x618a1)
                                                           #7  0x00007f46148bf378 _ZN14QXcbConnectionC2EP19QXcbNativeInterfacebjPKc (libQt5XcbQpa.so.5 + 0x3c378)
                                                           #8  0x00007f46148c212d _ZN15QXcbIntegrationC2ERK11QStringListRiPPc (libQt5XcbQpa.so.5 + 0x3f12d)
                                                           #9  0x00007f4614a71f91 _ZN22deepin_platform_plugin20DPlatformIntegrationC1ERK11QStringListRiPPc (libdxcb.so + 0x4cf91)
                                                           #10 0x00007f4614a716a7 _ZN26DPlatformIntegrationPlugin6createERK7QStringRK11QStringListRiPPc (libdxcb.so + 0x4c6a7)
                                                           #11 0x00007f461b41c627 _ZN22QGuiApplicationPrivate25createPlatformIntegrationEv (libQt5Gui.so.5 + 0x130627)
                                                           #12 0x00007f461b41dae1 _ZN22QGuiApplicationPrivate21createEventDispatcherEv (libQt5Gui.so.5 + 0x131ae1)
                                                           #13 0x00007f461b0522e6 _ZN23QCoreApplicationPrivate4initEv (libQt5Core.so.5 + 0x2bd2e6)
                                                           #14 0x00007f461b420b20 _ZN22QGuiApplicationPrivate4initEv (libQt5Gui.so.5 + 0x134b20)
                                                           #15 0x00007f461b421a88 _ZN15QGuiApplicationC1ERiPPci (libQt5Gui.so.5 + 0x135a88)
                                                           #16 0x00007f461d495b64 _ZN19KisOpenGLModeProber11probeFormatERKN9KisOpenGL14RendererConfigEb (libkritaui.so.20 + 0xd56b64)
                                                           #17 0x00007f461d47d9bc _ZN9KisOpenGL19selectSurfaceConfigENS_14OpenGLRendererEN9KisConfig17RootSurfaceFormatEb (libkritaui.so.20 + 0xd3e9bc)
                                                           #18 0x00005571a3218e7d main (krita + 0x8d1e7d)
                                                           #19 0x00007f461a9f8b25 __libc_start_main (libc.so.6 + 0x27b25)
                                                           #20 0x00005571a321b31e n/a (krita + 0x8d431e)

                                                           Stack trace of thread 502716:
                                                           #0  0x00007f461aac537f __poll (libc.so.6 + 0xf437f)
                                                           #1  0x00007f46184acae8 n/a (libglib-2.0.so.0 + 0xa7ae8)
                                                           #2  0x00007f4618456781 g_main_context_iteration (libglib-2.0.so.0 + 0x51781)
                                                           #3  0x00007f461b0a41ac _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x30f1ac)
                                                           #4  0x00007f461b049fec _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2b4fec)
                                                           #5  0x00007f461ae61e92 _ZN7QThread4execEv (libQt5Core.so.5 + 0xcce92)
                                                           #6  0x00007f4618e57098 n/a (libQt5DBus.so.5 + 0x17098)
                                                           #7  0x00007f461ae6307f n/a (libQt5Core.so.5 + 0xce07f)
                                                           #8  0x00007f4618e26299 start_thread (libpthread.so.0 + 0x9299)
                                                           #9  0x00007f461aad0053 __clone (libc.so.6 + 0xff053)

[City-busz]

Still crashes with deepin-qt5platform-plugins 5.0.23, but it doesn't crash with git master code, even if I explicitly set XDG_CURRENT_DESKTOP=deepin. So it seems that this crash was fixed after the 5.0.23 tag.

[City-busz]

It was fixed by de6c9f3

[BLumia]

Tested with deepin-qt5platform-plugins 5.0.59-2 under Arch Linux with DDE and it should works fine now :)