Bug#974730: systemd 247~rc2-2 install crashed several system

[Eric Valette]

Package: systemd
Version: 247~rc2-2
Severity: critical
Justification: breaks the whole system

I have updated several machine with experimental version and they did break for
various reasosn during install:

	1) One is a NAS that I was updating via ssh. during update, the ssh session closed,
	it was impossible to open a new one, and as the machine is headless, very difficult to
	know what happened. The power button did an acpi shutdwon and the machine
	did restart, but trying to do apt-get -f install, I have been prompted to do a
	dpkg --configure -a because update was interrupted.  After that the machine was
	operationnal again
	2) One was a laptop, running a very recent kernel 5.9.8, This time i did update
	logged on a X11 kde konsole. During update, the entire X session crashed, virtual
	terminal were unreachable, remote login was impossible. Doing a CTRL-ALT-DEL,
	somehow did shutdown the machine but rebooting was impossible. I had to select
	an old kernel with its own initramfs, and to downgrade systemd to the one from
	unstable to get things back on order.

Sorry to providfe little traces but I think it is usefull to warn that updating may cause
problem that may need a boot rescue medium to repair.

-- Package-specific info:

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 5.4.77 (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE
Locale: LANG=fr_FR.UTF8, LC_CTYPE=fr_FR.UTF8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  adduser            3.118
ii  libacl1            2.2.53-8
ii  libapparmor1       3.0.0-1
ii  libaudit1          1:3.0~alpha9-1
ii  libblkid1          2.36-3+b2
ii  libc6              2.31-4
ii  libcap2            1:2.44-1
ii  libcrypt1          1:4.4.17-1
ii  libcryptsetup12    2:2.3.4-1+exp1
ii  libgcrypt20        1.8.7-2
ii  libgnutls30        3.6.15-5
ii  libgpg-error0      1.38-2
ii  libidn2-0          2.3.0-3
ii  libip4tc2          1.8.6-1
ii  libkmod2           27+20200310-2
ii  liblz4-1           1.9.2-2
ii  liblzma5           5.2.4-1+b1
ii  libmount1          2.36-3+b2
ii  libpam0g           1.3.1-5
ii  libpcre2-8-0       10.34-7
ii  libseccomp2        2.5.0-3
ii  libselinux1        3.1-2+b1
ii  libsystemd0        246.6-2
ii  libzstd1           1.4.5+dfsg-4
ii  mount              2.36-3+b2
ii  ntp [time-daemon]  1:4.2.8p15+dfsg-1
ii  util-linux         2.36-3+b2

Versions of packages systemd recommends:
ii  dbus  1.13.18-1

Versions of packages systemd suggests:
ii  policykit-1        0.105-29
pn  systemd-container  <none>

Versions of packages systemd is related to:
pn  dracut           <none>
ii  initramfs-tools  0.139
ii  libnss-systemd   246.6-2
ii  libpam-systemd   246.6-2
ii  udev             246.6-2

-- Configuration Files:
/etc/systemd/journald.conf changed [not included]

-- no debconf information