[Bug 2993] New: core dump during reboot, if sshd 8.0p1 was started.

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https://bugzilla.mindrot.org/show_bug.cgi?id=2993

            Bug ID: 2993
           Summary: core dump during reboot, if sshd 8.0p1 was started.
           Product: Portable OpenSSH
           Version: 8.0p1
          Hardware: amd64
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: aleksey.moroz at gmail.com

linux mint 18.2

$ uname -mvr
4.15.0-47-generic #50~16.04.1-Ubuntu SMP Fri Mar 15 16:06:21 UTC 2019
x86_64 (but all the same on the other versions of the kernel, i'd used
for simplicity the latest stable one)

$ openssl version
LibreSSL 2.9.1

i'd tried three variants of starting sshd: with systemd (just copied
proper (and edited in accordance with my system) files from
openssh-server-7.2p2.deb /etc & /lib), from rc.local
("/usr/local/sbin/sshd -4 -f /etc/ssh/sshd_config &") and from command
line with sudo - results are the same (and it does not depend was sshd
killed after start manually or not).

reboot goes almost to the end, as i may see, all partitions are
unmounted before the last screen.
this "screen of the death" is not always the same, sometimes before
register's values there are the last lines with the list of the network
modules of the kernel.

if sshd is not started, reboot proceed seamlessly.

occasional observation: if sshd starts as service via systemd, it could
not be managed neither from systemd-manager-pkexec, nor from command
line (i.e kill & pkill does not work in this case).

to be totally sure, i'd restored tonight a backup from two months ago,
installed libressl 2.9.1, ldns 1.7, opensshd 8.0p1 and got the same sad
result.

donno how to save core dump to file.

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