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

[mm]

It seems to be still an apparmor problem:
[1863665.820588] audit: type=1400 audit(1588413129.073:171): apparmor="DENIED" operation="open" profile="/usr/sbin/dhcpd" name="/proc/sys/net/ipv4/ip_local_port_range" pid=38217 comm="dhcpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
[1863665.820937] audit: type=1400 audit(1588413129.073:172): apparmor="DENIED" operation="open" profile="/usr/sbin/dhcpd" name="/proc/sys/net/ipv4/ip_local_port_range" pid=38217 comm="dhcpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
[1863667.962021] audit: type=1400 audit(1588413131.217:173): apparmor="DENIED" operation="open" profile="/usr/sbin/dhcpd" name="/proc/sys/net/ipv4/ip_local_port_range" pid=38245 comm="dhcpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
[1863667.962161] audit: type=1400 audit(1588413131.217:174): apparmor="DENIED" operation="open" profile="/usr/sbin/dhcpd" name="/proc/sys/net/ipv4/ip_local_port_range" pid=38245 comm="dhcpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
[1863733.906438] audit: type=1400 audit(1588413197.163:175): apparmor="DENIED" operation="open" profile="/usr/sbin/dhcpd" name="/proc/sys/net/ipv4/ip_local_port_range" pid=38952 comm="dhcpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
[1863733.906772] audit: type=1400 audit(1588413197.163:176): apparmor="DENIED" operation="open" profile="/usr/sbin/dhcpd" name="/proc/sys/net/ipv4/ip_local_port_range" pid=38952 comm="dhcpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
[1863736.056880] audit: type=1400 audit(1588413199.315:177): apparmor="DENIED" operation="open" profile="/usr/sbin/dhcpd" name="/proc/sys/net/ipv4/ip_local_port_range" pid=38972 comm="dhcpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
[1863736.057187] audit: type=1400 audit(1588413199.315:178): apparmor="DENIED" operation="open" profile="/usr/sbin/dhcpd" name="/proc/sys/net/ipv4/ip_local_port_range" pid=38972 comm="dhcpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0

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

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

Status in apparmor 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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