https://bugs.kde.org/show_bug.cgi?id=422653
Bug ID: 422653
Summary: Xwayland gets segmentation faults at
wl_proxy_marshal_constructor under kwin_wayland 5.18.5
Product: kwin
Version: 5.18.5
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: nia1048...@gmail.com
Target Milestone: ---
SUMMARY
Manually execute a new Xwayland instance under kwin_wayland will get
segmentation fault.
STEPS TO REPRODUCE
1. Login to KDE wayland session and open a terminal
2. pick an empty DISPLAY (e.g. 10) and execute "Xwayland :10"
3. crash
OBSERVED RESULT
(gdb) run :10
Starting program: /usr/bin/Xwayland :10
...
Thread 1 "Xwayland" received signal SIGSEGV, Segmentation fault.
wl_proxy_marshal_constructor (proxy=0x0, opcode=opcode@entry=0,
interface=0x555555787c40 <wl_shell_surface_interface>)
at
/usr/src/debug/dev-libs/wayland-1.18.0/wayland-1.18.0/src/wayland-client.c:830
830
wl_argument_from_va_list(proxy->object.interface->methods[opcode].signature,
(gdb) bt
#0 wl_proxy_marshal_constructor (proxy=0x0, opcode=opcode@entry=0,
interface=0x555555787c40 <wl_shell_surface_interface>)
at
/usr/src/debug/dev-libs/wayland-1.18.0/wayland-1.18.0/src/wayland-client.c:830
#1 0x000055555558d4b2 in wl_shell_get_shell_surface (surface=<optimized out>,
wl_shell=<optimized out>)
at /usr/include/wayland-client-protocol.h:2926
#2 ensure_surface_for_window (window=window@entry=0x555555f46a00) at
xwayland.c:565
#3 0x000055555558db51 in xwl_realize_window (window=0x555555f46a00) at
xwayland.c:645
#4 0x00005555556be685 in compRealizeWindow (pWin=0x555555f46a00) at
compwindow.c:268
#5 0x0000555555700827 in MapWindow (pWin=pWin@entry=0x555555f46a00,
client=0x5555557bdf70) at window.c:2715
#6 0x00005555557009e7 in InitRootWindow (pWin=0x555555f46a00) at window.c:701
#7 0x00005555556d4b08 in dix_main (argc=2, argv=0x7fffffffdc38,
envp=<optimized out>) at main.c:247
#8 0x00005555556bf3d6 in main (argc=<optimized out>, argv=<optimized out>,
envp=<optimized out>) at stubmain.c:34
EXPECTED RESULT
Xwayland runs successfully without crash
SOFTWARE/OS VERSIONS
I can reproduce this bug in two environments.
The above backtrace comes from the first environment:
Operating System: Gentoo Linux
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.70.0
Qt Version: 5.14.2
Second environemnt:
Operating System: Arch Linux
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.70.0
Qt Version: 5.15.0
ADDITIONAL INFORMATION
The bug seems to happen after upgrading kwin to 5.18.5 from 5.17.5 on my Gentoo
box.
When running GNOME wayland session in Arch Linux, Xwayland works fine, so I
report the bug here to KDE.
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