Comment 7 for bug 1826294

Sorry, works just fine in this lunar vm here:

# id; logger before; ./reproducer.sh ; logger after
uid=0(root) gid=0(root) groups=0(root)
+ set -e
+ . /usr/share/os-prober/common.sh
+ cleanup_tmpdir=false
+ progname=
+ type mapdevfs
+ newns
+ [ ]
+ exec /usr/lib/os-prober/newns ./reproducer.sh
+ set -e
+ . /usr/share/os-prober/common.sh
+ cleanup_tmpdir=false
+ progname=
+ type mapdevfs
+ newns
+ [ 1 ]
+ log hello
+ cache_progname
+ progname=reproducer.sh
+ logger -t reproducer.sh hello

journal:
Mar 07 18:25:21 l-rsyslog-osprober root[2073]: before
Mar 07 18:25:21 l-rsyslog-osprober reproducer.sh[2075]: hello
Mar 07 18:25:21 l-rsyslog-osprober root[2076]: after

# uname -r
6.1.0-16-generic
# ps axwZ|grep rsyslog|grep -v grep
rsyslogd (enforce) 687 ? Ssl 0:00 /usr/sbin/rsyslogd -n -iNONE

systemd-journald-dev-log.socket is also running.

But I tried on amd64. Trying on arm64 will take more time.