[Bug 1872106] Re: isc-dhcp-server crashing constantly [Ubuntu 20.04]

[Michael-250]

I'm also trying to get isc-dhcp-server running on ubuntu 20.04 with
dhcp-failover. I'm using a rpi 3b+ and a kvm vm for failover. Both were
running fine with raspbian (rpi) and debian 9 (kvm vm). Now both are
running ubuntu 20.04 and isc-dhcp-server will constantly fail (same
error as mentioned in previous comments).

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Title:
  isc-dhcp-server crashing constantly [Ubuntu 20.04]

Status in isc-dhcp package in Ubuntu:
  Confirmed

Bug description:
  isc-dhcp-server crashing constantly (sometimes within seconds or minutes, sometimes within hours) with the following error messages:
  Apr 10 17:45:25 xxx dhcpd[140823]: Server starting service.
  Apr 10 17:45:25 xxx sh[140823]: ../../../../lib/isc/unix/socket.c:3361: INSIST(!sock->pending_send) failed, back trace
  Apr 10 17:45:25 xxx sh[140823]: #0 0x7f3362f59a4a in ??
  Apr 10 17:45:25 xxx sh[140823]: #1 0x7f3362f59980 in ??
  Apr 10 17:45:25 xxx sh[140823]: #2 0x7f3362f957e1 in ??
  Apr 10 17:45:25 xxx sh[140823]: #3 0x7f3362d3c609 in ??
  Apr 10 17:45:25 xxx sh[140823]: #4 0x7f3362e78103 in ??
  Apr 10 17:45:25 xxx systemd[1]: isc-dhcp-server.service: Main process exited, code=killed, status=6/ABRT
  Apr 10 17:45:25 xxx systemd[1]: isc-dhcp-server.service: Failed with result 'signal'.

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