（すでにインストールしましたsystemd-coredump）
QUIT何に信号を送るべきですかdebconf-communicate？
逆追跡に/が含まれていないため、この致命的な信号がraise()他の実行中のプログラムによってkill()送信されたと仮定できますか？debconf-communicate
man 7 signal信号はQUITもともと「キーボードから出る」ために使用されたと言います。信号（「キーボード割り込み」）との違いは、コアが意図的にダンプされることINTです。QUITおそらくこれはデバッグ技術のようです。 SIGINTCtrl+C キーの組み合わせで送信します。 SIGQUITCtrl+\ 経由で送信します。
aptしかし、端末で実行されているコマンドでCtrl + \を押す人がいなくても、これらのコアダンプを取得するようです。パッケージのアップグレードにPackageKitを使用すると、これが起こるようです（時々？）。
これはDebian 9デスクトップシステム（GNOME）です。この競合が発生した場合、ユーザーが何の問題も報告していないこと以外は何を期待するのかわかりません:-)。デフォルトのユーザーは通常、アップデートの適用に精通しており、アップデートの重要性を理解しています。
過去にアップデート通知を送信できなかったDebianのバグのため、システムは現在一般的ですpk-update-icon。.desktopgnome-packagekitgpk-update-viewergnome-software
$ dpkg-query -l packagekit gnome-software gnome-packagekit pk-update-icon debconf dpkg apt
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-====================-===============-===============-==============================================
ii apt 1.4.9 amd64 commandline package manager
ii debconf 1.5.61 all Debian configuration management system
ii dpkg 1.18.25 amd64 Debian package management system
ii gnome-packagekit 3.22.1-2 amd64 Graphical distribution neutral package manager
ii gnome-software 3.22.5-1 amd64 Software Center for GNOME
ii packagekit 1.1.5-2+deb9u1 amd64 Provides a package management service
ii pk-update-icon 2.0.0-2 amd64 Displays an update-notification tray icon
$ sudo coredumpctl --no-pager
TIME PID UID GID SIG COREFILE EXE
Thu 2018-07-12 10:13:09 BST 5059 1005 1009 3 missing /usr/bin/perl
Sat 2018-07-14 11:16:38 BST 2346 1005 1009 3 missing /usr/bin/perl
...
Wed 2019-05-22 14:35:32 BST 2535 1005 1009 3 missing /usr/bin/perl
Thu 2019-05-23 11:39:52 BST 2311 1005 1009 3 missing /usr/bin/perl
Sat 2019-05-25 10:16:47 BST 2445 1005 1009 3 missing /usr/bin/perl
Thu 2019-05-30 08:16:50 BST 2497 1005 1009 3 missing /usr/bin/perl
Fri 2019-05-31 11:10:27 BST 2404 1005 1009 3 missing /usr/bin/perl
Thu 2019-06-06 15:47:50 BST 4282 1005 1009 3 missing /usr/bin/perl
Fri 2019-06-07 10:16:49 BST 2640 1005 1009 3 missing /usr/bin/perl
$ sudo coredumpctl info 2640
PID: 2640 (debconf-communi)
UID: 1005 (YYY)
GID: 1009 (YYY)
Signal: 3 (QUIT)
Timestamp: Fri 2019-06-07 10:16:49 BST (4 days ago)
Command Line: /usr/bin/perl -w /usr/bin/debconf-communicate
Executable: /usr/bin/perl
Control Group: /user.slice/user-1005.slice/session-2.scope
Unit: session-2.scope
Slice: user-1005.slice
Session: 2
Owner UID: 1005 (YYY)
Boot ID: 37f2efd8086a42b5a39144b5411b1523
Machine ID: 35fb9280fa2847946f17a060542fd617
Hostname: drystone
Storage: /var/lib/systemd/coredump/core.debconf-communi.1005.37f2efd8086a42b5a39144b5411b1523.2640.1559899009000000000000.lz4 (inaccessible)
Message: Process 2640 (debconf-communi) of user 1005 dumped core.
Stack trace of thread 2640:
#0 0x00007fa8db86a210 read (libpthread.so.0)
#1 0x00005598354afa7d PerlIOUnix_read (perl)
#2 0x00005598354b2fcf PerlIOBuf_fill (perl)
#3 0x00005598354b1658 Perl_PerlIO_fill (perl)
#4 0x00005598354b2e80 PerlIOBase_read (perl)
#5 0x00005598354b4e08 PerlIO_getc (perl)
#6 0x000055983544b2a5 Perl_sv_gets (perl)
#7 0x000055983542d376 Perl_do_readline (perl)
#8 0x0000559835428aa6 Perl_runops_standard (perl)
#9 0x00005598353ae8a9 perl_run (perl)
#10 0x0000559835387a5d main (perl)
#11 0x00007fa8db4db2e1 __libc_start_main (libc.so.6)
#12 0x0000559835387a9a _start (perl)
$ sudo journalctl --since="2019-06-07"
...
Jun 07 10:16:05 drystone PackageKit[1359]: get-updates transaction /21666_bacedcbd from uid 1005 finished with success after 657ms
Jun 07 10:16:09 drystone PackageKit[1359]: new update-packages transaction /21669_aeeccbac scheduled from uid 1005
Jun 07 10:16:10 drystone PackageKit[1359]: get-update-detail transaction /21667_cebbebab from uid 1005 finished with success after 5406ms
Jun 07 10:16:11 drystone PackageKit[1359]: get-details transaction /21668_dabdcebe from uid 1005 finished with success after 395ms
Jun 07 10:16:11 drystone PackageKit[1359]: in /21669_aeeccbac for update-packages package evolution;3.22.6-1+deb9u2;amd64;debian-stable-main was updating for uid 1005
Jun 07 10:16:11 drystone PackageKit[1359]: in /21669_aeeccbac for update-packages package evolution-common;3.22.6-1+deb9u2;all;debian-stable-main was updating for uid 1005
Jun 07 10:16:11 drystone PackageKit[1359]: in /21669_aeeccbac for update-packages package evolution-plugins;3.22.6-1+deb9u2;amd64;debian-stable-main was updating for uid 1005
Jun 07 10:16:11 drystone PackageKit[1359]: in /21669_aeeccbac for update-packages package libevolution;3.22.6-1+deb9u2;amd64;debian-stable-main was updating for uid 1005
Jun 07 10:16:11 drystone PackageKit[1359]: in /21669_aeeccbac for update-packages package qemu-kvm;1:2.8+dfsg-6+deb9u7;amd64;debian-stable-main was updating for uid 1005
Jun 07 10:16:11 drystone PackageKit[1359]: in /21669_aeeccbac for update-packages package qemu-system-common;1:2.8+dfsg-6+deb9u7;amd64;debian-stable-main was updating for uid 1005
Jun 07 10:16:11 drystone PackageKit[1359]: in /21669_aeeccbac for update-packages package qemu-system-x86;1:2.8+dfsg-6+deb9u7;amd64;debian-stable-main was updating for uid 1005
Jun 07 10:16:11 drystone PackageKit[1359]: in /21669_aeeccbac for update-packages package qemu-utils;1:2.8+dfsg-6+deb9u7;amd64;debian-stable-main was updating for uid 1005
Jun 07 10:16:11 drystone PackageKit[1359]: update-packages transaction /21669_aeeccbac from uid 1005 finished with success after 585ms
Jun 07 10:16:11 drystone PackageKit[1359]: uid 1005 is trying to obtain org.freedesktop.packagekit.system-update auth (only_trusted:1)
Jun 07 10:16:11 drystone gnome-shell[1769]: JS LOG: polkitAuthenticationAgent: Received 2 identities that can be used for authentication. Only considering one.
Jun 07 10:16:16 drystone polkitd(authority=local)[589]: Operator of unix-session:2 successfully authenticated as unix-user:YYY to gain TEMPORARY authorization for action org.freedesktop.packagekit.system-update
Jun 07 10:16:16 drystone PackageKit[1359]: new update-packages transaction /21670_adbeabac scheduled from uid 1005
Jun 07 10:16:16 drystone PackageKit[1359]: uid 1005 obtained auth for org.freedesktop.packagekit.system-update
Jun 07 10:16:38 drystone packagekitd[1359]: PARENT process running...
Jun 07 10:16:41 drystone gnome-software-service.desktop[1906]: 09:16:41:0610 As failed to rescan: No valid root node specified
Jun 07 10:16:41 drystone gnome-software-service.desktop[1906]: 09:16:41:0617 As failed to rescan: Failed to parse /usr/share/applications/evolution.desktop file: cannot process file of type application/x-deskto
Jun 07 10:16:41 drystone gnome-software-service.desktop[1906]: 09:16:41:0642 As failed to rescan: No valid root node specified
Jun 07 10:16:41 drystone gnome-software-service.desktop[1906]: 09:16:41:0646 As failed to rescan: Failed to parse /usr/share/applications/evolution.desktop.dpkg-tmp file: cannot process file of type text/plain
Jun 07 10:16:42 drystone gnome-software-service.desktop[1906]: 09:16:42:0406 As failed to rescan: No valid root node specified
Jun 07 10:16:42 drystone gnome-software-service.desktop[1906]: 09:16:42:0410 As failed to rescan: No valid root node specified
Jun 07 10:16:42 drystone gnome-software-service.desktop[1906]: 09:16:42:0410 As failed to rescan: No valid root node specified
Jun 07 10:16:42 drystone gnome-software-service.desktop[1906]: 09:16:42:0414 As failed to rescan: No valid root node specified
Jun 07 10:16:42 drystone gnome-software-service.desktop[1906]: 09:16:42:0414 As failed to rescan: No valid root node specified
Jun 07 10:16:44 drystone gnome-software-service.desktop[1906]: 09:16:44:0075 As failed to rescan: No valid root node specified
Jun 07 10:16:44 drystone gnome-software-service.desktop[1906]: 09:16:44:0078 As failed to rescan: No valid root node specified
Jun 07 10:16:44 drystone gnome-software-service.desktop[1906]: 09:16:44:0082 As failed to rescan: No valid root node specified
Jun 07 10:16:49 drystone packagekitd[1359]: Parent finished...
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package qemu-system-common;1:2.8+dfsg-6+deb9u7;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package evolution-plugins;3.22.6-1+deb9u2;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package evolution;3.22.6-1+deb9u2;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package libevolution;3.22.6-1+deb9u2;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package evolution-common;3.22.6-1+deb9u2;all;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package qemu-kvm;1:2.8+dfsg-6+deb9u7;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package qemu-system-x86;1:2.8+dfsg-6+deb9u7;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package qemu-utils;1:2.8+dfsg-6+deb9u7;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package evolution-common;3.22.6-1+deb9u2;all;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package libglib2.0-0;2.50.3-2;amd64;installed:debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package qemu-utils;1:2.8+dfsg-6+deb9u7;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package libevolution;3.22.6-1+deb9u2;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package qemu-system-common;1:2.8+dfsg-6+deb9u7;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package qemu-system-x86;1:2.8+dfsg-6+deb9u7;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package evolution;3.22.6-1+deb9u2;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package evolution-plugins;3.22.6-1+deb9u2;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: in /21670_adbeabac for update-packages package qemu-kvm;1:2.8+dfsg-6+deb9u7;amd64;debian-stable-main was installing for uid 1005
Jun 07 10:16:49 drystone PackageKit[1359]: update-packages transaction /21670_adbeabac from uid 1005 finished with success after 33545ms
Jun 07 10:16:49 drystone gpk-update-view[2476]: Source ID 1825 was not found when attempting to remove it
Jun 07 10:16:49 drystone systemd[1]: Created slice system-systemd\x2dcoredump.slice.
Jun 07 10:16:49 drystone systemd[1]: Started Process Core Dump (PID 3620/UID 0).
Jun 07 10:16:49 drystone systemd-coredump[3621]: Process 2640 (debconf-communi) of user 1005 dumped core.
Stack trace of thread 2640:
#0 0x00007fa8db86a210 read (libpthread.so.0)
#1 0x00005598354afa7d PerlIOUnix_read (perl)
#2 0x00005598354b2fcf PerlIOBuf_fill (perl)
#3 0x00005598354b1658 Perl_PerlIO_fill (perl)
#4 0x00005598354b2e80 PerlIOBase_read (perl)
#5 0x00005598354b4e08 PerlIO_getc (perl)
#6 0x000055983544b2a5 Perl_sv_gets (perl)
#7 0x000055983542d376 Perl_do_readline (perl)
#8 0x0000559835428aa6 Perl_runops_standard (perl)
#9 0x00005598353ae8a9 perl_run (perl)
#10 0x0000559835387a5d main (perl)
#11 0x00007fa8db4db2e1 __libc_start_main (libc.so.6)
#12 0x0000559835387a9a _start (perl)
Jun 07 10:16:50 drystone PackageKit[1359]: get-updates transaction /21671_baceadea from uid 1005 finished with success after 597ms
Jun 07 10:16:50 drystone gpk-update-view[2476]: gtk_widget_hide: assertion 'GTK_IS_WIDGET (widget)' failed
Jun 07 10:16:52 drystone PackageKit[1359]: get-updates transaction /21672_cdcdcbca from uid 1005 finished with success after 884ms
Jun 07 10:16:52 drystone gpk-update-view[2476]: gtk_widget_hide: assertion 'GTK_IS_WIDGET (widget)' failed
Jun 07 10:16:55 drystone gpk-update-view[2476]: g_application_release: assertion 'application->priv->use_count > 0' failed
Jun 07 10:16:57 drystone PackageKit[1359]: get-updates transaction /21673_bdabdecd from uid 1005 finished with success after 638ms
Jun 07 10:17:01 drystone CRON[3642]: pam_env(cron:session): Unable to open env file: /etc/environment: No such file or directory
Jun 07 10:17:01 drystone CRON[3642]: pam_unix(cron:session): session opened for user root by (uid=0)
Jun 07 10:17:01 drystone CRON[3643]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Jun 07 10:17:01 drystone CRON[3642]: pam_unix(cron:session): session closed for user root
Jun 07 10:24:14 drystone systemd[1]: Starting Cleanup of Temporary Directories...
Jun 07 10:24:14 drystone systemd[1]: Started Cleanup of Temporary Directories.
答え1
https://github.com/hughsie/PackageKit/blob/PACKAGEKIT_1_1_5/NEWS#L6157
〜バージョン0.1.1〜リリース日：2007-10-23
[...]
新機能：
[...]
- ロックを解除してバックエンドをきれいに整理できるように送信し、
SIGQUIT少し遅らせます。SIGKILL私たちがキャンセルしたとき(リチャード・ヒューズ)