[kwin] [Bug 400547] New: Alt + Tab in Nexuiz will crash the system (Wayland)

[Rainer Finke]

https://bugs.kde.org/show_bug.cgi?id=400547

Bug ID: 400547
Summary: Alt + Tab in Nexuiz will crash the system (Wayland)
Product: kwin
Version: 5.14.2
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-***@kde.org
Reporter: ***@rainer-finke.de
Target Milestone: ---

If I use Alt + Tab in in nexuiz-sdl on Plasma Wayland, my system will
crash/freeze and I have to reset the system. Nexuiz-sdl runs on XWayland. So
this might be an issue of XWayland, but it is unfortunate that it seems to
crash/freeze kwin and my hole system, I cannot even switch to another TTY (only
ssh works). Other XWayland games do not have the same issue.


STEPS TO REPRODUCE
1. Open nexuiz-sdl on Plasma Wayland
2. Use Alt + Tab

OBSERVED RESULT
system crash

EXPECTED RESULT
I can switch between applications

SOFTWARE VERSIONS
KDE Plasma Version: 5.14.2
KDE Frameworks Version: 5.51
Qt Version: 5.12 beta 3
Wayland 1.16
XWayland 1.20.3
Mesa-git on AMDGPU

ADDITIONAL INFORMATION
Crash log:

Nov 01 13:20:12 pc audit[1461]: ANOM_ABEND auid=1000 uid=1000 gid=991 ses=2
pid=1461 comm="Xwayland" exe="/usr/bin/Xwayland" sig=6 res=1
Nov 01 13:20:12 pc kernel: audit: type=1701 audit(1541074812.337:60): auid=1000
uid=1000 gid=991 ses=2 pid=1461 comm="Xwayland" exe="/usr/bin/Xwayland" sig=6
res=1
Nov 01 13:20:12 pc systemd[1]: Created slice system-systemd\x2dcoredump.slice.
Nov 01 13:20:12 pc systemd[1]: Started Process Core Dump (PID 3598/UID 0).
Nov 01 13:20:12 pc audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295
ses=4294967295 msg='unit=systemd-***@0-3598-0 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Nov 01 13:20:12 pc kernel: audit: type=1130 audit(1541074812.353:61): pid=1
uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-***@0-3598-0
comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=?
res=success'
Nov 01 13:20:13 pc pulseaudio[1603]: XIO: fatal IO error 11 (Die Ressource ist
zur Zeit nicht verfügbar) on X server ":1"
Nov 01 13:20:13 pc pulseaudio[1603]: after 12 requests (6 known
processed) with 0 events remaining.
Nov 01 13:20:13 pc gmenudbusmenuproxy[1590]: The X11 connection broke (error
1). Did the X11 server die?
Nov 01 13:20:13 pc ksmserver[1549]: The X11 connection broke (error 1). Did the
X11 server die?
Nov 01 13:20:13 pc kaccess[1546]: The X11 connection broke (error 1). Did the
X11 server die?
Nov 01 13:20:13 pc xembedsniproxy[1588]: The X11 connection broke (error 1).
Did the X11 server die?
Nov 01 13:20:13 pc kdeinit5[1520]: kdeinit5: Fatal IO error: client killed
Nov 01 13:20:13 pc kdeinit5[1520]: kdeinit5: sending SIGHUP to children.
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1520]: kdeinit5: sending SIGTERM to children.
Nov 01 13:20:13 pc kdeinit5[1520]: kdeinit5: Exit.
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: bluedevil: Destroyed
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc systemd[1389]: pulseaudio.service: Main process exited,
code=exited, status=1/FAILURE
Nov 01 13:20:13 pc systemd[1389]: pulseaudio.service: Failed with result
'exit-code'.
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kalarm[2107]: org.kde.knotifications: env says KDE is
running but SNI unavailable -- check KDE_FULL_SESSION and XDG_CURRENT_DESKTOP
Nov 01 13:20:13 pc korgac[1622]: org.kde.knotifications: env says KDE is
running but SNI unavailable -- check KDE_FULL_SESSION and XDG_CURRENT_DESKTOP
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc kdeinit5[1527]: QDBusAbstractAdaptor: Cannot relay signal
KDEDModule::moduleDeleted(KDEDModule*): Pointers are not supported: KDEDModule*
Nov 01 13:20:13 pc systemd-coredump[3599]: Process 1461 (Xwayland) of user 1000
dumped core.

Stack trace of thread
1461:
#0 0x00007f59ce751d7f
raise (libc.so.6)
#1 0x00007f59ce73c672
abort (libc.so.6)
#2 0x000055be55e28f3a
n/a (Xwayland)
#3 0x000055be55e21615
n/a (Xwayland)
#4 0x000055be55e2c776
n/a (Xwayland)
#5 0x00007f59ce751e00
__restore_rt (libc.so.6)
#6 0x00007f59ce751d7f
raise (libc.so.6)
#7 0x00007f59ce73c672
abort (libc.so.6)
#8 0x00007f59ce73c548
__assert_fail_base.cold.0 (libc.so.6)
#9 0x00007f59ce74a396
__assert_fail (libc.so.6)
#10 0x000055be55f424cb
n/a (Xwayland)
#11 0x000055be55e9133e
n/a (Xwayland)
#12 0x000055be55e915b5
n/a (Xwayland)
#13 0x000055be55e9469f
n/a (Xwayland)
#14 0x000055be55ebd108
n/a (Xwayland)
#15 0x000055be55f02805
n/a (Xwayland)
#16 0x000055be55f02e5b
n/a (Xwayland)
#17 0x000055be55ec1c0a
n/a (Xwayland)
#18 0x000055be55ec618c
n/a (Xwayland)
#19 0x000055be55ef0d8c
n/a (Xwayland)
#20 0x000055be55ef3100
n/a (Xwayland)
#21 0x000055be55ded10d
n/a (Xwayland)
#22 0x00007f59ce73e223
__libc_start_main (libc.so.6)
#23 0x000055be55dee13e
n/a (Xwayland)

Stack trace of thread
1490:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1479:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1485:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1463:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1468:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1480:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1482:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1491:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1487:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1489:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1497:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1492:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1467:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1472:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1474:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1471:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1481:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1473:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1465:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1477:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1484:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1494:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1493:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1476:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1496:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1478:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1466:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1475:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1469:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1495:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1464:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1486:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1488:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1498:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1470:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cae5f863
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cae5f5b7
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

Stack trace of thread
1483:
#0 0x00007f59cd629afc
pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1 0x00007f59cb343dfb
cnd_wait (radeonsi_dri.so)
#2 0x00007f59cb343d57
impl_thrd_routine (radeonsi_dri.so)
#3 0x00007f59cd623a9d
start_thread (libpthread.so.0)
#4 0x00007f59ce815b23
__clone (libc.so.6)

[Martin Flöser]

https://bugs.kde.org/show_bug.cgi?id=400547

Martin Flöser <***@kde.org> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|REPORTED |NEEDSINFO
Resolution|--- |BACKTRACE

--- Comment #1 from Martin Flöser <***@kde.org> ---
Please provide a backtrace of the crashing KWin.

[Rainer Finke]

https://bugs.kde.org/show_bug.cgi?id=400547

--- Comment #2 from Rainer Finke <***@rainer-finke.de> ---
I've tried to get a backtrace (connected via SSH and gdb to kwin_wayland), but
kwin seems to exit directly after pressing Alt + Tab. I've compiled kwin-git,
to have on Arch Linux a debug output available, but it didn't change anything.
I've tested it now as well on a Intel GPU, same issue. After Alt + Tab, you
cannot do anything anymore on the machine as the system freezes and doesn't
accept input anymore (except SSH and reboot).

(gdb) continue
Continuing.
[New Thread 0x7f27d6ffd700 (LWP 6139)]
[New Thread 0x7f28c0ff9700 (LWP 6141)]
[New Thread 0x7f28c2ffd700 (LWP 6142)]
[New Thread 0x7f27d77fe700 (LWP 6143)]
[New Thread 0x7f28d95c1700 (LWP 6144)]
[New Thread 0x7f28c8989700 (LWP 6145)]
[New Thread 0x7f28c3fff700 (LWP 6186)]
[Thread 0x7f28d9dc2700 (LWP 1536) exited]
[Thread 0x7f28db3fe700 (LWP 1535) exited]
[Thread 0x7f28dbfff700 (LWP 1532) exited]
[Thread 0x7f28c3fff700 (LWP 6186) exited]
[Thread 0x7f28e9d59700 (LWP 1531) exited]
[Thread 0x7f28c2ffd700 (LWP 6142) exited]
[Thread 0x7f27d6ffd700 (LWP 6139) exited]
[Thread 0x7f28c0ff9700 (LWP 6141) exited]
[Thread 0x7f28d95c1700 (LWP 6144) exited]
[Thread 0x7f28c8989700 (LWP 6145) exited]
[Thread 0x7f27d77fe700 (LWP 6143) exited]

[Patrick Silva]

https://bugs.kde.org/show_bug.cgi?id=400547

Patrick Silva <***@gmx.com> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |***@gmx.com

--- Comment #3 from Patrick Silva <***@gmx.com> ---
I have the same problem on my Arch Linux.
coredumpctl command shows Xwayland crash here.
Maybe related to the following crash report
https://gitlab.freedesktop.org/xorg/xserver/issues/8

[Roman Gilg]

https://bugs.kde.org/show_bug.cgi?id=400547

Roman Gilg <***@gmail.com> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |***@gmail.com

--- Comment #4 from Roman Gilg <***@gmail.com> ---
If the crash is in Xwayland you need Xserver debug symbols.

[Bug Janitor Service]

https://bugs.kde.org/show_bug.cgi?id=400547

--- Comment #5 from Bug Janitor Service <bug-***@kde.org> ---
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

[Patrick Silva]

https://bugs.kde.org/show_bug.cgi?id=400547

Patrick Silva <***@gmx.com> changed:

What |Removed |Added
----------------------------------------------------------------------------
Resolution|BACKTRACE |---
Status|NEEDSINFO |REPORTED

--- Comment #6 from Patrick Silva <***@gmx.com> ---
(In reply to Roman Gilg from comment #4)

Post by Roman Gilg
If the crash is in Xwayland you need Xserver debug symbols.

Thread 1 "Xwayland" received signal SIGABRT, Aborted.
0x00007f8c85c7ad7f in raise () from target:/usr/lib/libc.so.6
(gdb) set logging on
Copying output to gdb.txt.
(gdb) bt
#0 0x00007f8c85c7ad7f in raise () from target:/usr/lib/libc.so.6
#1 0x00007f8c85c65672 in abort () from target:/usr/lib/libc.so.6
#2 0x00007f8c85c65548 in __assert_fail_base.cold.0 ()
from target:/usr/lib/libc.so.6
#3 0x00007f8c85c73396 in __assert_fail () from target:/usr/lib/libc.so.6
#4 0x000055dd49dda43b in xwl_present_flips_stop (window=<optimized out>,
window=<optimized out>)
at ../xorg-server-1.20.3/hw/xwayland/xwayland-present.c:521
#5 0x000055dd49d292ae in present_wnmd_flips_stop (window=<optimized out>,
window=<optimized out>) at ../xorg-server-1.20.3/present/present_wnmd.c:159
#6 0x000055dd49d29525 in present_wnmd_check_flip_window (
window=0x55dd4bea85e0) at ../xorg-server-1.20.3/present/present_wnmd.c:332
#7 0x000055dd49d2c60f in present_clip_notify (window=0x55dd4bea85e0, dx=0,
dy=0) at ../xorg-server-1.20.3/present/present_screen.c:203
#8 0x000055dd49d55078 in compClipNotify (pWin=0x55dd4bea85e0, dx=0, dy=0)
at ../xorg-server-1.20.3/composite/compwindow.c:317
#9 0x000055dd49d9a775 in miComputeClips (
pParent=***@entry=0x55dd4bea85e0,
pScreen=***@entry=0x55dd4b6f2320,
universe=***@entry=0x7ffc4b921fa0, kind=***@entry=VTMap,
exposed=***@entry=0x7ffc4b921f80) at
../xorg-server-1.20.3/mi/mivaltree.c:478
#10 0x000055dd49d9adcb in miValidateTree (pParent=0x55dd4be98890,
pChild=0x55dd4bea85e0, kind=<optimized out>) at
../xorg-server-1.20.3/mi/mivaltree.c:681
#11 0x000055dd49d59b7a in MapWindow (pWin=<optimized out>, client=<optimized
out>, pWin=<optimized out>, client=<optimized out>) at
../xorg-server-1.20.3/dix/window.c:2699
#12 0x000055dd49d5e0fc in ReparentWindow (pWin=0x55dd4bea85e0,
pParent=0x55dd4be98890, x=<optimized out>, y=<optimized out>,
client=0x55dd4be13bf0) at ../xorg-server-1.20.3/dix/window.c:2600
#13 0x000055dd49d88cfc in ProcReparentWindow (client=0x55dd4be13bf0) at
../xorg-server-1.20.3/dix/dispatch.c:829
#14 0x000055dd49d8b070 in Dispatch () at
../xorg-server-1.20.3/dix/dispatch.c:478
#15 0x000055dd49c8512d in dix_main (envp=<optimized out>, argv=<optimized out>,
argc=<optimized out>) at ../xorg-server-1.20.3/dix/main.c:276
#16 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at
../xorg-server-1.20.3/dix/stubmain.c:34