[Bug 1870729] Re: DHCP Server regularly killed code=killed, status=6/ABRT

[Andrew Welham]

I tried this.
If you stop the primary dhcp server
Start the backup (This time it works)
Restart the primary dhcp server
Secondary dhcp server fails with the error 

Apr  8 06:26:00 dhcp-backupl dhcpd[1360]: failover peer failover-partner: peer moves from communications-interrupted to normal
Apr  8 06:26:00 dhcp-backupl dhcpd[1360]: failover peer failover-partner: Both servers normal
Apr  8 06:26:00 dhcp-backupl sh[1360]: ../../../../lib/isc/unix/socket.c:3361: INSIST(!sock->pending_send) failed, back trace
Apr  8 06:26:00 dhcp-backupl sh[1360]: #0 0x7fbe199fda4a in ??
Apr  8 06:26:00 dhcp-backupl sh[1360]: #1 0x7fbe199fd980 in ??
Apr  8 06:26:00 dhcp-backupl sh[1360]: #2 0x7fbe19a397e1 in ??
Apr  8 06:26:00 dhcp-backupl sh[1360]: #3 0x7fbe197e0609 in ??
Apr  8 06:26:00 dhcp-backupl sh[1360]: #4 0x7fbe1991c103 in ??
Apr  8 06:26:01 dhcp-backupl systemd[1]: isc-dhcp-server.service: Main process exited, code=killed, status=6/ABRT
Apr  8 06:26:01 dhcp-backupl systemd[1]: isc-dhcp-server.service: Failed with result 'signal'

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Title:
  DHCP Server regularly killed code=killed, status=6/ABRT

Status in isc-dhcp package in Ubuntu:
  Fix Released

Bug description:
  On Ubuntu 20.04 The idc-dhcp- server version is
  isc-dhcp-server:
    Installed: (none)
    Candidate: 4.4.1-2.1ubuntu3
    Version table:
       4.4.1-2.1ubuntu3 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

  
  The DHCP server is being regularly killed, when searching google the  bug looks very similar to an older bug regarding accessing a lease file, that was fixed year ago. As a temporary fix in systemd I have enabled a restart every time the main process fails. The error got worse when i start to run a pair of dhcp servers syncing state between each other

  
  I regularly see the following in the syslog

  Apr  4 00:04:55 gw sh[1500]: ../../../../lib/isc/unix/socket.c:3361: INSIST(!sock->pending_send) failed, back trace
  Apr  4 00:04:55 gw sh[1500]: #0 0x7f36befeda4a in ??
  Apr  4 00:04:55 gw sh[1500]: #1 0x7f36befed980 in ??
  Apr  4 00:04:55 gw sh[1500]: #2 0x7f36bf0297e1 in ??
  Apr  4 00:04:55 gw sh[1500]: #3 0x7f36bedd0609 in ??
  Apr  4 00:04:55 gw sh[1500]: #4 0x7f36bef0c153 in ??
  Apr  4 00:04:55 gw systemd[1]: isc-dhcp-server.service: Main process exited, code=killed, status=6/ABRT
  Apr  4 00:04:55 gw systemd[1]: isc-dhcp-server.service: Failed with result 'signal'.
  Apr  4 00:05:00 gw systemd[1]: isc-dhcp-server.service: Scheduled restart job, restart counter is at 3.
  Apr  4 00:05:00 gw systemd[1]: Stopped ISC DHCP IPv4 server.
  Apr  4 00:05:00 gw systemd[1]: Started ISC DHCP IPv4 server.
  Apr  4 00:05:00 gw kernel: [ 3508.161248] audit: type=1400 audit(1585958700.678:46): apparmor="DENIED" operation="open" profile="/usr/sbin/dhcpd" name="/proc/2049/task/2068/comm" pid=2049 comm="dhcpd" requested_mask="wr" denied_mask="wr" fsuid=0 ouid=0
  Apr  4 00:05:00 gw dhcpd[2049]: Internet Systems Consortium DHCP Server 4.4.1
  Apr  4 00:05:00 gw sh[2049]: Internet Systems Consortium DHCP Server 4.4.1
  Apr  4 00:05:00 gw sh[2049]: Copyright 2004-2018 Internet Systems Consortium.
  Apr  4 00:05:00 gw sh[2049]: All rights reserved.
  Apr  4 00:05:00 gw sh[2049]: For info, please visit https://www.isc.org/software/dhcp/
  Apr  4 00:05:00 gw dhcpd[2049]: Copyright 2004-2018 Internet Systems Consortium.
  Apr  4 00:05:00 gw dhcpd[2049]: All rights reserved.
  Apr  4 00:05:00 gw dhcpd[2049]: For info, please visit https://www.isc.org/software/dhcp/
  Apr  4 00:05:00 gw kernel: [ 3508.161561] audit: type=1400 audit(1585958700.678:47): apparmor="DENIED" operation="open" profile="/usr/sbin/dhcpd" name="/proc/2049/task/2069/comm" pid=2049 comm="dhcpd" requested_mask="wr" denied_mask="wr" fsuid=0 ouid=0
  Apr  4 00:05:00 gw kernel: [ 3508.161563] audit: type=1400 audit(1585958700.682:48): apparmor="DENIED" operation="open" profile="/usr/sbin/dhcpd" name="/proc/2049/task/2070/comm" pid=2049 comm="dhcpd" requested_mask="wr" denied_mask="wr" fsuid=0 ouid=0
  Apr  4 00:05:00 gw dhcpd[2049]: Config file: /etc/dhcp/dhcpd.conf
  Apr  4 00:05:00 gw sh[2049]: Config file: /etc/dhcp/dhcpd.conf
  Apr  4 00:05:00 gw sh[2049]: Database file: /var/lib/dhcp/dhcpd.leases
  Apr  4 00:05:00 gw sh[2049]: PID file: /run/dhcp-server/dhcpd.pid
  Apr  4 00:05:00 gw dhcpd[2049]: Database file: /var/lib/dhcp/dhcpd.leases
  Apr  4 00:05:00 gw dhcpd[2049]: PID file: /run/dhcp-server/dhcpd.pid
  Apr  4 00:05:00 gw dhcpd[2049]: Wrote 0 deleted host decls to leases file.

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