* bug#33592: "herd restart term-tty2" caused *all* processes to be killed
@ 2018-12-03 1:16 Mark H Weaver
2018-12-03 8:44 ` Ludovic Courtès
0 siblings, 1 reply; 3+ messages in thread
From: Mark H Weaver @ 2018-12-03 1:16 UTC (permalink / raw)
To: 33592
After killing a Wayland 'gnome-session' that I had launched from the
command-line on tty2, the login prompt did not return as it normally
does.
I decided to try "herd restart term-tty2" to see if that would help.
That turned out to be a serious mistake. It caused TERM to be sent to
all processes, most filesystems to be unmounted, and many (all?) core
services to be stopped. This left my system in a unusuable state,
besides being able to switch between otherwise unresponsive text virtual
terminals and issue SysRq commands.
I took a picture of the display before resetting the machine.
Fortunately I always use text virtual terminals for my root shells.
Here's a hand-typed approximation of what shepherd printed to the
console:
--8<---------------cut here---------------start------------->8---
root@jojen ~# herd restart term-tty2
[200060.46xxxx] shepherd[1]: Service term-tty4 has been stopped.
[200060.46xxxx] shepherd[1]: Service nscd has been stopped.
[200060.47xxxx] shepherd[1]: Service guix-daemon has been stopped.
[200060.47xxxx] shepherd[1]: Service term-tty2 has been stopped.
[200060.47xxxx] shepherd[1]: Service console-font-tty1 has been stopped.
[200060.48xxxx] shepherd[1]: Service term-tty1 has been stopped.
[200060.48xxxx] shepherd[1]: Service console-font-tty5 has been stopped.
[200060.48xxxx] shepherd[1]: Service term-tty5 has been stopped.
[200060.49xxxx] shepherd[1]: sending all processes the TERM signal
[200064.81xxxx] shepherd[1]: all processes have been terminated
[200064.81xxxx] shepherd[1]: Service user-processes has been stopped.
[200064.82xxxx] shepherd[1]: Service urandom-seed has been stopped.
[200064.82xxxx] shepherd[1]: Service file-systems has been stopped.
[200064.83xxxx] shepherd[1]: Service file-system-/dev/pts has been stopped.
[200064.84xxxx] shepherd[1]: Service file-system-/sys/fs/cgroup/blkio has been stopped.
[200064.86xxxx] shepherd[1]: Service file-system-/gnu/store has been stopped.
[200064.88xxxx] shepherd[1]: Service file-system-/sys/fs/cgroup/freezer has been stopped.
[200064.90xxxx] shepherd[1]: Service file-system-/run/systemd has been stopped.
[200064.91xxxx] shepherd[1]: Service file-system-/sys/fs/cgroup/cpuset has been stopped.
[200064.93xxxx] shepherd[1]: Service file-system-/sys/fs/cgroup/cpuacct has been stopped.
[200064.95xxxx] shepherd[1]: Service file-system-/sys/fs/cgroup/devices has been stopped.
[200064.96xxxx] shepherd[1]: Service file-system-/sys/fs/cgroup/perf_event has been stopped.
[200064.98xxxx] shepherd[1]: Service file-system-/run/user has been stopped.
[200065.00xxxx] shepherd[1]: Service file-system-/dev/shm has been stopped.
[200065.01xxxx] shepherd[1]: Service file-system-/sys/fs/cgroup/memory has been stopped.
[200065.03xxxx] shepherd[1]: Service file-system-/sys/fs/cgroup/elogind has been stopped.
[200065.05xxxx] shepherd[1]: Service file-system-/sys/fs/cgroup/cpu has been stopped.
[200065.06xxxx] shepherd[1]: Service file-system-/sys/fs/cgroup has been stopped.
[200065.06xxxx] shepherd[1]: system-error("kill" "~A" ("No such process") (3))
[200065.06xxxx] shepherd[1]: Service udev has been stopped.
[200065.06xxxx] shepherd[1]: Service virtual-terminal has been stopped.
[200065.19xxxx] shepherd[1]: closing log
[200065.23xxxx] BTRFS info (device dm-0): disk space caching is enabled
--8<---------------cut here---------------end--------------->8---
The 'xxxx' are of course more digits that I was too lazy to type.
I would not have expected 'term-tty2' to have many dependents, except
possibly for 'console-font-tty2'. It was a great surprise that
restarting it caused so many other core services to be stopped.
Any idea what went wrong here?
Mark
^ permalink raw reply [flat|nested] 3+ messages in thread
* bug#33592: "herd restart term-tty2" caused *all* processes to be killed
2018-12-03 1:16 bug#33592: "herd restart term-tty2" caused *all* processes to be killed Mark H Weaver
@ 2018-12-03 8:44 ` Ludovic Courtès
2018-12-04 2:10 ` Mark H Weaver
0 siblings, 1 reply; 3+ messages in thread
From: Ludovic Courtès @ 2018-12-03 8:44 UTC (permalink / raw)
To: Mark H Weaver; +Cc: 33592
[-- Attachment #1: Type: text/plain, Size: 1043 bytes --]
Hello,
Mark H Weaver <mhw@netris.org> skribis:
> After killing a Wayland 'gnome-session' that I had launched from the
> command-line on tty2, the login prompt did not return as it normally
> does.
>
> I decided to try "herd restart term-tty2" to see if that would help.
> That turned out to be a serious mistake. It caused TERM to be sent to
> all processes, most filesystems to be unmounted, and many (all?) core
> services to be stopped. This left my system in a unusuable state,
> besides being able to switch between otherwise unresponsive text virtual
> terminals and issue SysRq commands.
Per ‘guix system shepherd-graph desktop.tmpl’, the only dependent of
‘term-tty2’ is ‘console-font-tty2’.
I just tried in a desktop.tmpl VM and only ‘console-font-tty2’ is
restarted (screenshot attached.) Same on my laptop, which uses Xorg but
not GNOME.
Could it be something with the Wayland-related services? Could you
check ‘guix system shepherd-graph’ on your config?
Thanks,
Ludo’.
[-- Attachment #2: the screenshot --]
[-- Type: image/png, Size: 57396 bytes --]
^ permalink raw reply [flat|nested] 3+ messages in thread
* bug#33592: "herd restart term-tty2" caused *all* processes to be killed
2018-12-03 8:44 ` Ludovic Courtès
@ 2018-12-04 2:10 ` Mark H Weaver
0 siblings, 0 replies; 3+ messages in thread
From: Mark H Weaver @ 2018-12-04 2:10 UTC (permalink / raw)
To: Ludovic Courtès; +Cc: 33592
[-- Attachment #1: Type: text/plain, Size: 1286 bytes --]
Hi,
ludo@gnu.org (Ludovic Courtès) writes:
> Mark H Weaver <mhw@netris.org> skribis:
>
>> After killing a Wayland 'gnome-session' that I had launched from the
>> command-line on tty2, the login prompt did not return as it normally
>> does.
>>
>> I decided to try "herd restart term-tty2" to see if that would help.
>> That turned out to be a serious mistake. It caused TERM to be sent to
>> all processes, most filesystems to be unmounted, and many (all?) core
>> services to be stopped. This left my system in a unusuable state,
>> besides being able to switch between otherwise unresponsive text virtual
>> terminals and issue SysRq commands.
>
> Per ‘guix system shepherd-graph desktop.tmpl’, the only dependent of
> ‘term-tty2’ is ‘console-font-tty2’.
>
> I just tried in a desktop.tmpl VM and only ‘console-font-tty2’ is
> restarted (screenshot attached.) Same on my laptop, which uses Xorg but
> not GNOME.
>
> Could it be something with the Wayland-related services? Could you
> check ‘guix system shepherd-graph’ on your config?
I did so, and it shows that the only dependent of 'term-tty2' is
'console-font-tty2', as expected.
I've attached my OS config, in case it contains any clues.
Thanks,
Mark
[-- Attachment #2: OS config --]
[-- Type: text/plain, Size: 7291 bytes --]
;; This is an operating system configuration template
;; for a "desktop" setup with GNOME and Xfce where the
;; root partition is encrypted with LUKS.
(use-modules (gnu) (gnu system nss) (srfi srfi-1) (guix packages))
(use-service-modules base desktop networking xorg dbus)
(use-package-modules certs gnome cryptsetup linux admin guile firmware xdisorg libusb suckless)
(define keymap
(plain-file
"keymap"
"keymaps 0-255
keycode 42 = Shift
keycode 54 = Shift
keycode 29 = Control
keycode 58 = Control
keycode 56 = Alt
keycode 100 = Alt
alt shift keycode 1 = Meta_Escape
alt shift keycode 2 = Meta_exclam
alt shift keycode 3 = Meta_at
alt shift keycode 4 = Meta_numbersign
alt shift keycode 5 = Meta_dollar
alt shift keycode 6 = Meta_percent
alt shift keycode 7 = Meta_asciicircum
shift control keycode 7 = Control_asciicircum
control alt keycode 7 = Meta_Control_asciicircum
shift control alt keycode 7 = Meta_Control_asciicircum
alt shift keycode 8 = Meta_ampersand
alt shift keycode 9 = Meta_asterisk
alt shift keycode 10 = Meta_parenleft
alt shift keycode 11 = Meta_parenright
alt shift keycode 12 = Meta_underscore
shift control keycode 12 = Control_underscore
control alt keycode 12 = Meta_Control_underscore
shift control alt keycode 12 = Meta_Control_underscore
alt shift keycode 13 = Meta_plus
alt shift keycode 14 = Meta_Delete
alt shift keycode 15 = Meta_Tab
alt shift keycode 16 = Meta_Q
alt shift keycode 17 = Meta_W
alt shift keycode 18 = Meta_E
alt shift keycode 19 = Meta_R
alt shift keycode 20 = Meta_T
alt shift keycode 21 = Meta_Y
alt shift keycode 22 = Meta_U
alt shift keycode 23 = Meta_I
alt shift keycode 24 = Meta_O
alt shift keycode 25 = Meta_P
alt shift keycode 26 = Meta_braceleft
control alt keycode 26 = Meta_Escape
alt shift keycode 27 = Meta_braceright
control alt keycode 27 = Meta_Control_bracketright
alt shift keycode 28 = Meta_Control_m
alt shift keycode 29 = Meta_Control
alt shift keycode 30 = Meta_A
alt shift keycode 31 = Meta_S
alt shift keycode 32 = Meta_D
alt shift keycode 33 = Meta_F
alt shift keycode 34 = Meta_G
alt shift keycode 35 = Meta_H
alt shift keycode 36 = Meta_J
alt shift keycode 37 = Meta_K
alt shift keycode 38 = Meta_L
alt shift keycode 39 = Meta_colon
alt shift keycode 40 = Meta_quotedbl
alt shift keycode 41 = Meta_asciitilde
alt shift keycode 43 = Meta_bar
control alt keycode 43 = Meta_Control_backslash
alt shift keycode 44 = Meta_Z
alt shift keycode 45 = Meta_X
alt shift keycode 46 = Meta_C
alt shift keycode 47 = Meta_V
alt shift keycode 48 = Meta_B
alt shift keycode 49 = Meta_N
alt shift keycode 50 = Meta_M
alt shift keycode 51 = Meta_less
alt shift keycode 52 = Meta_greater
alt shift keycode 53 = Meta_question
alt shift keycode 57 = Meta_space
"))
(operating-system
(host-name "jojen")
(timezone "right/US/Eastern")
(locale "en_US.utf8")
(bootloader (bootloader-configuration
(bootloader grub-bootloader)
(target "/dev/sda")))
(kernel linux-libre)
;;(firmware (list ath9k-htc-firmware))
(firmware '())
;; Specify a mapped device for the encrypted root partition.
;; The UUID is that returned by 'cryptsetup luksUUID'.
(mapped-devices
(list (mapped-device
(source (uuid "a56c53e7-b345-4e24-a17b-6cf158dbc7d3"))
(target "jojen-root")
(type luks-device-mapping))))
(file-systems (cons* (file-system
;; FIXME: reference by the file system label?
(device "/dev/mapper/jojen-root")
(mount-point "/")
(type "btrfs")
(dependencies mapped-devices))
%base-file-systems))
(users (cons* (user-account
(name "mhw")
(uid 1000)
(group "mhw")
(supplementary-groups '("wheel" "users" "netdev"
"audio" "video" "dialout"))
(home-directory "/home/mhw"))
%base-user-accounts))
(groups (cons* (user-group
(name "mhw")
(id 1000))
%base-groups))
(setuid-programs
(list (file-append shadow "/bin/passwd")
(file-append inetutils "/bin/ping")))
;; This is where we specify system-wide packages.
(packages (cons* nss-certs ;for HTTPS access
gvfs ;for user mounts
cryptsetup
btrfs-progs
wpa-supplicant
network-manager
network-manager-applet
(delete sudo %base-packages)))
(services (cons* (console-keymap-service keymap)
;;(xfce-desktop-service)
(gnome-desktop-service)
(service network-manager-service-type
(network-manager-configuration))
(service wpa-supplicant-service-type)
;; Desktop services follow
(slim-service)
(screen-locker-service slock)
;;(screen-locker-service xlockmore "xlock")
(simple-service 'mtp udev-service-type (list libmtp))
;;(avahi-service) ; I don't trust this
;;(wicd-service) ; using NetworkManager instead
(udisks-service)
(upower-service)
(colord-service)
;;(geoclue-service) ; I don't want this
(polkit-service)
(elogind-service)
(dbus-service)
;;(ntp-service) ; I don't trust this
;; Optional OpenNTPd, below
#;
(service
openntpd-service-type
(openntpd-configuration
(listen-on '("127.0.0.1" "::1"))
;;(constraint-from '("www.gnu.org"))
(allow-large-adjustment? #t)))
(modify-services (remove (lambda (svc)
(eq? (service-kind svc)
wicd-service-type))
%base-services)
;; This is for debugging
#;
(nscd-service-type config =>
(nscd-configuration
(inherit config)
(debug-level 3)
(log-file "/var/log/nscd.log")))
;; I don't trust the build farm
(guix-service-type config =>
(guix-configuration
(inherit config)
(use-substitutes? #f)
(authorized-keys '())
(substitute-urls '())
(extra-options '("--gc-keep-derivations=yes"
"--gc-keep-outputs=yes")))))))
;; Allow resolution of '.local' host names with mDNS.
;;(name-service-switch %mdns-host-lookup-nss) ; disabled for now
)
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-12-03 1:16 bug#33592: "herd restart term-tty2" caused *all* processes to be killed Mark H Weaver
2018-12-03 8:44 ` Ludovic Courtès
2018-12-04 2:10 ` Mark H Weaver
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