[Bug 1931077] Re: emergency shell ignores all keyboard input

[Marius Gedminas]

Looking at the journal, I think the sequence of events is:

- SSD fails last Friday
- I log in today over ssh, start messing around
- I notice that collectd is not running (since Friday), try to `sudo systemctl start collectd`
- systemd tries to bring up collectd's dependency local-fs.target, which need /dev/sda1, which is the failed drive
- I figure _that_ out and start editing /etc/fstab to switch the /boot/efi device to the backup on /dev/sdb1
- in the background systemd gives up on local-fs.target and starts emergency.target, which shuts down all the services (including sshd, but not killing my ssh session) and brings up an emergency shell
- I finish editing /etc/fstab and do a `sudo mount /boot/efi; sudo systemctl daemon-reload; sudo systemctl start collectd`
- systemd notices that local-fs.target is all fine actually and stops the emergency shell
- systemd doesn't start all the services that it shut down minutes ago
- I exit my ssh session by mistake

and now we have the situation where the emergency shell is stopped but
its startup message remains, confusing users.  (And also no systemd
services are running, except for collectd, which is not very useful for
getting the system back online.)

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https://bugs.launchpad.net/bugs/1931077

Title:
  emergency shell ignores all keyboard input

Status in systemd package in Ubuntu:
  New

Bug description:
  An SSD that held my /boot/efi partition failed, took down local-fs.target, which brought up emergency.target.  I ended up with no ssh access, and a message on the local console telling me
  to press Enter to get a root shell, or press Ctrl-D to continue booting normally.  The system did not react to either Enter or Ctrl-D.  I could switch between virtual consoles (but nothing was running on them, e.g. no getty), toggle Caps Lock, or reboot with Ctrl+Alt+Del.

  An emergency console that doesn't accept keyboard input is not a
  useful emergency console.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 237-3ubuntu10.47
  ProcVersionSignature: Ubuntu 4.15.0-144.148-generic 4.15.18
  Uname: Linux 4.15.0-144-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.24
  Architecture: amd64
  Date: Mon Jun  7 11:18:39 2021
  MachineType: System manufacturer System Product Name
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-144-generic root=/dev/mapper/hostname-root ro
  SourcePackage: systemd
  UpgradeStatus: Upgraded to bionic on 2019-08-12 (664 days ago)
  dmi.bios.date: 08/14/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2204
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8Z77-V LX
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2204:bd08/14/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8Z77-VLX:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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