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

[mm]

New error log:
Apr 10 22:11:47 xxx dhcpd[3765]: Server starting service.
Apr 10 22:11:47 xxx dhcpd[3765]: failover peer dhcp-failover: peer moves from normal to communications-interrupted
Apr 10 22:11:47 xxx dhcpd[3765]: failover peer dhcp-failover: I move from startup to normal
Apr 10 22:11:47 xxx dhcpd[3765]: balancing pool 561b77e547d0 192.168.1.0/24  total 60  free 27  backup 33  lts 3  max-own (+/-)6
Apr 10 22:11:47 xxx dhcpd[3765]: balanced pool 561b77e547d0 192.168.1.0/24  total 60  free 27  backup 33  lts 3  max-misbal 9
Apr 10 22:11:47 xxx dhcpd[3765]: failover peer dhcp-failover: peer moves from communications-interrupted to normal
Apr 10 22:11:47 xxx dhcpd[3765]: failover peer dhcp-failover: Both servers normal
Apr 10 22:11:47 xxx sh[3765]: ../../../../lib/isc/unix/socket.c:4359: fatal error: select() failed: Bad file descriptor
Apr 10 22:11:47 xxx systemd[1]: isc-dhcp-server.service: Main process exited, code=killed, status=6/ABRT
Apr 10 22:11:47 xxx systemd[1]: isc-dhcp-server.service: Failed with result 'signal'.

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https://bugs.launchpad.net/bugs/1872106

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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