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On 2017-11-09T20:49:38+00:00 Michael wrote:

Version-Release number of selected component:
xorg-x11-server-Xwayland-1.19.3-4.fc26

Additional info:
reporter:       libreport-2.9.1
backtrace_rating: 4
cmdline:        /home/mcatanzaro/Projects/GNOME/install/bin/Xwayland :1 
-rootless -terminate -core -listen 4 -listen 5 -displayfd 6
crash_function: xwl_read_events
executable:     /usr/bin/Xwayland
journald_cursor: 
s=ca44c691f28b4a3fa6affd95ab5151f5;i=1b36b7;b=1bb81d6006b3438f9124fe2aa5b58740;m=a0fe9fcbc;t=55ce29a097191;x=9b45217435b11c67
kernel:         4.13.9-200.fc26.x86_64
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/0

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On 2017-11-09T20:49:46+00:00 Michael wrote:

Created attachment 1350099
File: backtrace

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/1

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On 2017-11-09T20:49:47+00:00 Michael wrote:

Created attachment 1350100
File: cgroup

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/2

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On 2017-11-09T20:49:48+00:00 Michael wrote:

Created attachment 1350101
File: core_backtrace

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/3

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On 2017-11-09T20:49:49+00:00 Michael wrote:

Created attachment 1350102
File: cpuinfo

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/4

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On 2017-11-09T20:49:50+00:00 Michael wrote:

Created attachment 1350103
File: dso_list

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/5

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On 2017-11-09T20:49:51+00:00 Michael wrote:

Created attachment 1350104
File: environ

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/6

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On 2017-11-09T20:49:52+00:00 Michael wrote:

Created attachment 1350105
File: limits

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/7

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On 2017-11-09T20:49:53+00:00 Michael wrote:

Created attachment 1350106
File: maps

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/8

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On 2017-11-09T20:49:55+00:00 Michael wrote:

Created attachment 1350107
File: open_fds

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/9

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On 2017-11-09T20:49:56+00:00 Michael wrote:

Created attachment 1350108
File: proc_pid_status

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/10

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On 2017-11-09T20:49:57+00:00 Michael wrote:

Created attachment 1350109
File: var_log_messages

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/11

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On 2017-11-10T09:26:11+00:00 Olivier wrote:

Same as bug 1510078, this is a abort() because Xwayland (Wayland client)
cannot read events from the Wayland compositor (gnome-shell.mutter,
presumably) which is most likely a crash in gnome-shell/mutter in the
first place.

xwl_read_events() aborts in two cases, either it fails to read the
events (wl_display_read_events) or it fails to dispatch the events
(wl_display_dispatch_pending), in both cases it's a communication issue
with the Wayland compositor.

Can you quickly check in the logs at the time of the crash if gnome-
shell/mutter had crashed or failed to start (I've seen this happening as
well at startup, gnome-shell starts, spawns Xwayland, then fails, and
Xwayland aborts in xwl_read_events())

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/12

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On 2017-11-18T06:51:36+00:00 Justin wrote:

I am also experiencing this on Fedora 27, 4.14.0-1, Nouveau,  t I think
you're right Olivier, this is likely from a crash in mutter:

I see in the logs:
gnome-shell: segfault at ... in libmutter-1.so.0.0.0...
gnome-logs: Error reading events from display: Connection reset by peer
kernel: (EE)
Xwayland: ANOM_ABEND ...
gnome-session-b: gnome-session-binary: WARNING: Application 
'org.gnome.Shell.desktop' killed by signal 11

(stack trace...)
systemd:coredum: Process 2515 (gnome-shell) of user 1000 dumped core.

The stack trace has:
#0 and #1 in libc.so.6
#2 OsAbort (Xwayland)
#3 AbortServer (Xwayland)
#4 FatalError (Xwayland)
#5 xwl_read_events (Xwayland)
#6 ospoll_wait (Xwayland)

I haven't been able to determine if some user action causes this. It
seems to happen when I have the screen off (perhaps a notification
triggers this crash? or turning the screen on, which activates the
Displayport link, triggers the crash?)

I have mutter and gnome-shell at 3.26.2-1, and gnome-session(-xsession,
-wayland-session) at 3.26.1-1.

Please let me know what more would be useful.

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/20

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On 2017-12-12T23:25:14+00:00 rugk wrote:

Maybe that is related to my issue Bug 1513807 ?

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/24

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On 2017-12-13T05:50:50+00:00 Raymond wrote:

I was also experiencing this same problem after fresh install of Fedora
27. The problem is easily and always reproducible. The steps are :

1. login properly
2. power off monitor (or wait until screen saver cause the monitor to 
auto-sleep)
3. power back on the monitor (or wake-up from monitor sleep mode)

It reports "gnome-shell" was crashed and I have to re-login again.

I used just an ordinary HDMI full-HD monitor. This always happens, even
just after fresh reboot. Should be something when the HDMI connection
back on caused something to crash.

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/25

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On 2017-12-13T13:21:09+00:00 Olivier wrote:

This is simply Xwayland telling your Wayland compositor (namely gnome-
shell/mutter) has died.

Basically, gnome-shell (now) runs Xwayland with “-core” which means that
*any* FatalError() in Xwayland will dump a core file.

xwl_read_events() triggers a FatalError() because the Wayland socket is
unusable, and it's unusable because the Wayland compositor (the other
side of the socket) has died, i.e. crashed most likely.

The Wayland compositor is gnome-shell/mutter, so if you could please
look into journalctl and coredumpctl to find a backtrace and/or generate
one with coredumpctl and gdb.

>From comment 15, this is most likely a dupe of bug 1500325.

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1731911/comments/26

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https://bugs.launchpad.net/bugs/1731911

Title:
  Xwayland crashed with SIGABRT in OsAbort()

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