Public bug reported:

The isc-dhcp-server crashes regularly on bionic, sometimes directly after boot, 
sometimes later.
The version installed is 4.3.5-3ubuntu7.

journalctl shows:
Jul 14 09:35:11 <hostname> dhcpd[1543]: Solicit message from 
fe80::18eb:dfc7:17e5:c8d7 port 546, transaction ID 0x7E8EC00
Jul 14 09:35:11 <hostname> dhcpd[1543]: Advertise NA: address <subnet>::1998 to 
client with duid 00:01:00:01:21:9f:3a:02:d4:a3:3d:bf:17:e9 iaid = 0 valid for 8
Jul 14 09:35:11 <hostname> dhcpd[1543]: Sending Advertise to 
fe80::18eb:dfc7:17e5:c8d7 port 546
Jul 14 09:35:12 <hostname> dhcpd[1543]: Request message from 
fe80::18eb:dfc7:17e5:c8d7 port 546, transaction ID 0x65FADB00
Jul 14 09:35:12 <hostname> dhcpd[1543]: Reply NA: address <subnet>::1998 to 
client with duid 00:01:00:01:21:9f:3a:02:d4:a3:3d:bf:17:e9 iaid = 0 valid for 
86400
Jul 14 09:35:12 <hostname> dhcpd[1543]: Sending Reply to 
fe80::18eb:dfc7:17e5:c8d7 port 546
Jul 14 09:35:53 <hostname> dhcpd[1543]: Confirm message from 
fe80::725a:b6ff:fea2:6120 port 546, transaction ID 0x5105F400
Jul 14 09:35:53 <hostname> dhcpd[1543]: Sending Reply to 
fe80::725a:b6ff:fea2:6120 port 546
Jul 14 09:35:53 <hostname> dhcpd[1543]: Rebind message from 
fe80::725a:b6ff:fea2:6120 port 546, transaction ID 0x1FEA7E00
Jul 14 09:35:53 <hostname> dhcpd[1543]: Reply NA: address <subnet>::1992 to 
client with duid 00:04:c2:47:10:e8:8b:dc:d4:a1:0a:1d:21:f2:be:20:e8:a0 iaid = 
-1230
Jul 14 09:35:53 <hostname> sh[1543]: ../../../lib/isc/heap.c:251: REQUIRE(idx 
>= 1 && idx <= heap->last) failed, back trace
Jul 14 09:35:53 <hostname> sh[1543]: #0 0x7efc458a6417 in ??
Jul 14 09:35:53 <hostname> sh[1543]: #1 0x7efc458a636a in ??
Jul 14 09:35:53 <hostname> sh[1543]: #2 0x7efc458ad4ea in ??
Jul 14 09:35:53 <hostname> sh[1543]: #3 0x55d9ee65d571 in ??
Jul 14 09:35:53 <hostname> sh[1543]: #4 0x55d9ee658701 in ??
Jul 14 09:35:53 <hostname> sh[1543]: #5 0x55d9ee65ab05 in ??
Jul 14 09:35:53 <hostname> sh[1543]: #6 0x55d9ee65bff3 in ??
Jul 14 09:35:53 <hostname> sh[1543]: #7 0x55d9ee65cafc in ??
Jul 14 09:35:53 <hostname> sh[1543]: #8 0x55d9ee678402 in ??
Jul 14 09:35:53 <hostname> sh[1543]: #9 0x55d9ee667463 in ??
Jul 14 09:35:53 <hostname> sh[1543]: #10 0x55d9ee696476 in ??
Jul 14 09:35:53 <hostname> sh[1543]: #11 0x7efc458dd73b in ??
Jul 14 09:35:53 <hostname> sh[1543]: #12 0x7efc458ccf9e in ??
Jul 14 09:35:53 <hostname> sh[1543]: #13 0x7efc458d1e60 in ??
Jul 14 09:35:53 <hostname> sh[1543]: #14 0x7efc458d2325 in ??
Jul 14 09:35:53 <hostname> sh[1543]: #15 0x55d9ee6696b0 in ??
Jul 14 09:35:53 <hostname> sh[1543]: #16 0x55d9ee61d519 in ??
Jul 14 09:35:53 <hostname> sh[1543]: #17 0x7efc454c6b97 in ??
Jul 14 09:35:53 <hostname> sh[1543]: #18 0x55d9ee61de0a in ??
Jul 14 09:35:54 <hostname> systemd[1]: isc-dhcp-server6.service: Main process 
exited, code=dumped, status=6/ABRT
Jul 14 09:35:54 <hostname> systemd[1]: isc-dhcp-server6.service: Failed with 
result 'core-dump'.

The bug was reported to Debian independently, https://bugs.debian.org
/cgi-bin/bugreport.cgi?bug=896122.

** Affects: isc-dhcp (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1781699

Title:
  DHCPv6 server crashes regularly (bionic)

Status in isc-dhcp package in Ubuntu:
  New

Bug description:
  The isc-dhcp-server crashes regularly on bionic, sometimes directly after 
boot, sometimes later.
  The version installed is 4.3.5-3ubuntu7.

  journalctl shows:
  Jul 14 09:35:11 <hostname> dhcpd[1543]: Solicit message from 
fe80::18eb:dfc7:17e5:c8d7 port 546, transaction ID 0x7E8EC00
  Jul 14 09:35:11 <hostname> dhcpd[1543]: Advertise NA: address <subnet>::1998 
to client with duid 00:01:00:01:21:9f:3a:02:d4:a3:3d:bf:17:e9 iaid = 0 valid 
for 8
  Jul 14 09:35:11 <hostname> dhcpd[1543]: Sending Advertise to 
fe80::18eb:dfc7:17e5:c8d7 port 546
  Jul 14 09:35:12 <hostname> dhcpd[1543]: Request message from 
fe80::18eb:dfc7:17e5:c8d7 port 546, transaction ID 0x65FADB00
  Jul 14 09:35:12 <hostname> dhcpd[1543]: Reply NA: address <subnet>::1998 to 
client with duid 00:01:00:01:21:9f:3a:02:d4:a3:3d:bf:17:e9 iaid = 0 valid for 
86400
  Jul 14 09:35:12 <hostname> dhcpd[1543]: Sending Reply to 
fe80::18eb:dfc7:17e5:c8d7 port 546
  Jul 14 09:35:53 <hostname> dhcpd[1543]: Confirm message from 
fe80::725a:b6ff:fea2:6120 port 546, transaction ID 0x5105F400
  Jul 14 09:35:53 <hostname> dhcpd[1543]: Sending Reply to 
fe80::725a:b6ff:fea2:6120 port 546
  Jul 14 09:35:53 <hostname> dhcpd[1543]: Rebind message from 
fe80::725a:b6ff:fea2:6120 port 546, transaction ID 0x1FEA7E00
  Jul 14 09:35:53 <hostname> dhcpd[1543]: Reply NA: address <subnet>::1992 to 
client with duid 00:04:c2:47:10:e8:8b:dc:d4:a1:0a:1d:21:f2:be:20:e8:a0 iaid = 
-1230
  Jul 14 09:35:53 <hostname> sh[1543]: ../../../lib/isc/heap.c:251: REQUIRE(idx 
>= 1 && idx <= heap->last) failed, back trace
  Jul 14 09:35:53 <hostname> sh[1543]: #0 0x7efc458a6417 in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #1 0x7efc458a636a in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #2 0x7efc458ad4ea in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #3 0x55d9ee65d571 in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #4 0x55d9ee658701 in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #5 0x55d9ee65ab05 in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #6 0x55d9ee65bff3 in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #7 0x55d9ee65cafc in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #8 0x55d9ee678402 in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #9 0x55d9ee667463 in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #10 0x55d9ee696476 in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #11 0x7efc458dd73b in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #12 0x7efc458ccf9e in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #13 0x7efc458d1e60 in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #14 0x7efc458d2325 in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #15 0x55d9ee6696b0 in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #16 0x55d9ee61d519 in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #17 0x7efc454c6b97 in ??
  Jul 14 09:35:53 <hostname> sh[1543]: #18 0x55d9ee61de0a in ??
  Jul 14 09:35:54 <hostname> systemd[1]: isc-dhcp-server6.service: Main process 
exited, code=dumped, status=6/ABRT
  Jul 14 09:35:54 <hostname> systemd[1]: isc-dhcp-server6.service: Failed with 
result 'core-dump'.

  The bug was reported to Debian independently, https://bugs.debian.org
  /cgi-bin/bugreport.cgi?bug=896122.

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