Created attachment 1270749 [details]
File: backtrace

Created attachment 1270750 [details]
File: cgroup

Created attachment 1270751 [details]
File: core_backtrace

Created attachment 1270752 [details]
File: dso_list

Created attachment 1270753 [details]
File: environ

Created attachment 1270754 [details]
File: limits

Created attachment 1270755 [details]
File: maps

Created attachment 1270756 [details]
File: open_fds

Created attachment 1270757 [details]
File: proc_pid_status

Created attachment 1270758 [details]
File: var_log_messages

*** Bug 1460430 has been marked as a duplicate of this bug. ***

Similar problem has been detected:

Attempt to run one of virtualized operating system within Gnome Boxes

reporter:       libreport-2.9.1
backtrace_rating: 4
cmdline:        /usr/bin/gnome-boxes --gapplication-service
crash_function: boxes_app_setup_default_source_co
executable:     /usr/bin/gnome-boxes
journald_cursor: s=2ef2a058d654471eac9d9d6a5ac7570e;i=1e6d1;b=3be0a2e7190c46e591c0afe466317850;m=76c0017d4;t=552a42e1bbc68;x=3833f6ab3f191677
kernel:         4.11.6-20170605.amdmainhyb.fc26.x86_64
package:        gnome-boxes-3.24.0-3.fc26
reason:         gnome-boxes killed by signal 6
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

*** Bug 1464726 has been marked as a duplicate of this bug. ***

Similar problem has been detected:

Just run Boxes. It showed "loading" icon and crashed.

reporter:       libreport-2.9.1
backtrace_rating: 4
cmdline:        gnome-boxes
crash_function: boxes_app_setup_default_source_co
executable:     /usr/bin/gnome-boxes
journald_cursor: s=c0ca3c4806a04efe887c5d6b3e5eed5d;i=1ef379;b=11d18cc2ed4949988f7152ec3e1f7083;m=158b83ed6e;t=554097c7df452;x=cf5e60adafad826e
kernel:         4.11.6-301.fc26.x86_64
package:        gnome-boxes-3.24.0-3.fc26
reason:         gnome-boxes killed by signal 6
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

Similar problem has been detected:

Starting Gnome Boxes

reporter:       libreport-2.9.1
backtrace_rating: 4
cmdline:        /usr/bin/gnome-boxes --gapplication-service
crash_function: boxes_app_setup_default_source_co
executable:     /usr/bin/gnome-boxes
journald_cursor: s=7ba13736064e4c2f844711e5e7471d1f;i=44361;b=73d53ae1097747fb81960dcc4eb1821b;m=5264d4f60;t=55478fc45284f;x=9429745575e03bd9
kernel:         4.11.10-20170605.amdmainhyb.fc26.x86_64
package:        gnome-boxes-3.24.0-3.fc26
reason:         gnome-boxes killed by signal 6
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

Similar problem has been detected:

I opened a Windows 10 VM on boxes

reporter:       libreport-2.9.1
backtrace_rating: 4
cmdline:        /usr/bin/gnome-boxes --gapplication-service
crash_function: boxes_app_setup_default_source_co
executable:     /usr/bin/gnome-boxes
journald_cursor: s=d9463083d8f64d07920d0586739d2b10;i=4f76c;b=236c4fe86df546b7841b2cc14d475320;m=5422493ab;t=5549b332a7342;x=109f181b31526f04
kernel:         4.11.10-300.fc26.x86_64
package:        gnome-boxes-3.24.0-3.fc26
reason:         gnome-boxes killed by signal 6
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

Similar problem has been detected:

Issue persists in Fedora 26

reporter:       libreport-2.9.1
backtrace_rating: 4
cmdline:        /usr/bin/gnome-boxes --gapplication-service
crash_function: boxes_app_setup_default_source_co
executable:     /usr/bin/gnome-boxes
journald_cursor: s=dc16c976f8024e79a92fef55b2455268;i=1f51f0;b=3ad7fca7dbe0485a9f655a387e4c9d25;m=154e3f72a;t=5550a34bedd42;x=2138f6be85141268
kernel:         4.11.10-300.fc26.x86_64
package:        gnome-boxes-3.24.0-3.fc26
reason:         gnome-boxes killed by signal 6
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

*** Bug 1477395 has been marked as a duplicate of this bug. ***

*** Bug 1477527 has been marked as a duplicate of this bug. ***

Similar problem has been detected:

Just after app was opened

reporter:       libreport-2.9.1
backtrace_rating: 4
cmdline:        /usr/bin/gnome-boxes --gapplication-service
crash_function: boxes_app_setup_default_source_co
executable:     /usr/bin/gnome-boxes
journald_cursor: s=681293bdf8d74985bc969067333c98f1;i=a988;b=1ebd42491ee042e8a94e3d68aa524e53;m=699bd033;t=5575fc5964406;x=b5974ec9fc1f657f
kernel:         4.12.5-300.fc26.x86_64
package:        gnome-boxes-3.24.0-3.fc26
reason:         gnome-boxes killed by signal 6
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

*** Bug 1484513 has been marked as a duplicate of this bug. ***

*** Bug 1491946 has been marked as a duplicate of this bug. ***

Similar problem has been detected:

starting a vm

reporter:       libreport-2.9.1
backtrace_rating: 4
cmdline:        gnome-boxes --open-uuid c7fbe447-8e5e-4fef-998b-70d387f085e4
crash_function: boxes_app_setup_default_source_co
executable:     /usr/bin/gnome-boxes
journald_cursor: s=7aeac0b20d044f3f9ee764268936c76a;i=10ce5;b=3ae902cf7be347c7a7e13d2e853b98ea;m=11e4b3a48a1;t=5594203ee89f4;x=6d87f5c2dbe50d93
kernel:         4.12.9-300.fc26.x86_64
package:        gnome-boxes-3.24.0-3.fc26
reason:         gnome-boxes killed by signal 6
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

*** Bug 1493929 has been marked as a duplicate of this bug. ***

*** Bug 1494333 has been marked as a duplicate of this bug. ***

*** Bug 1495169 has been marked as a duplicate of this bug. ***

*** Bug 1498310 has been marked as a duplicate of this bug. ***

*** Bug 1499524 has been marked as a duplicate of this bug. ***

Similar problem has been detected:

starting boxes

reporter:       libreport-2.9.1
backtrace_rating: 4
cmdline:        /usr/bin/gnome-boxes --gapplication-service
crash_function: boxes_app_setup_default_source_co
executable:     /usr/bin/gnome-boxes
journald_cursor: s=7aeac0b20d044f3f9ee764268936c76a;i=6e560;b=5f4da3b023d245c8b5c13cdab3c0c9f1;m=f506956742;t=55b23df00e69d;x=7f2bc01404c6b3cc
kernel:         4.12.14-300.fc26.x86_64
package:        gnome-boxes-3.24.0-3.fc26
reason:         gnome-boxes killed by SIGABRT
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

*** Bug 1502180 has been marked as a duplicate of this bug. ***

*** Bug 1509562 has been marked as a duplicate of this bug. ***

*** Bug 1509582 has been marked as a duplicate of this bug. ***

*** Bug 1513735 has been marked as a duplicate of this bug. ***

This problem is real and is found by several users on both Fedora 26 and Fedora 27 
https://retrace.fedoraproject.org/faf/reports/bthash/d6912d6a07d31bbd7bf56b6e294d5c8bcafd2368

I can still reproduce this.

$ gnome-boxes 
Error setting up default broker: Unable to open qemu+unix:///session: Cannot recv data: Connection reset by peer
**
Boxes:ERROR:app.c:3287:boxes_app_setup_default_source_co: assertion failed: (default_connection != null)
Aborted (core dumped)

gnome-boxes-3.24.1-3.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2018-14246218d4

gnome-boxes-3.24.1-3.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-14246218d4

gnome-boxes-3.26.2-4.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-714dc69cea

gnome-boxes-3.24.1-3.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.

gnome-boxes-3.26.2-4.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.