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Issue created by Richard Laager@rlaager

DHCP cluster crashes after a few hours

Describe the bug

When running a cluster using dhcpd 4.4.1 or 4.4.2, at least with Ubuntu patches, dhcpd crashes after a few hours.

Here are two instances of the crash with the packaged 4.4.1 from Ubuntu 20.04:

2020-07-31T06:28:28.138646-05:00 salmon sh[764]: ../../../../lib/isc/unix/socket.c:3361: INSIST(!sock->pending_send) failed, back trace
2020-07-31T06:28:28.138704-05:00 salmon sh[764]: #0 0x7fdd3f4b4a4a in ??
2020-07-31T06:28:28.138768-05:00 salmon sh[764]: #1 0x7fdd3f4b4980 in ??
2020-07-31T06:28:28.138809-05:00 salmon sh[764]: #2 0x7fdd3f4f07e1 in ??
2020-07-31T06:28:28.138849-05:00 salmon sh[764]: #3 0x7fdd3f297609 in ??
2020-07-31T06:28:28.138887-05:00 salmon sh[764]: #4 0x7fdd3f3d3103 in ??

2020-07-31T07:02:54.013649-05:00 salmon sh[32432]: ../../../../lib/isc/unix/socket.c:3361: INSIST(!sock->pending_send) failed, back trace
2020-07-31T07:02:54.013674-05:00 salmon sh[32432]: #0 0x7fb12a7e0a4a in ??
2020-07-31T07:02:54.013693-05:00 salmon sh[32432]: #1 0x7fb12a7e0980 in ??
2020-07-31T07:02:54.013711-05:00 salmon sh[32432]: #2 0x7fb12a81c7e1 in ??
2020-07-31T07:02:54.013728-05:00 salmon sh[32432]: #3 0x7fb12a5c3609 in ??
2020-07-31T07:02:54.013753-05:00 salmon sh[32432]: #4 0x7fb12a6ff103 in ??

To Reproduce

At this point, I'm not certain that it has to be a cluster configuration, but everyone reporting it (including me) seems to be running a cluster.

It's also not clear how much configuration is relevant either.

For me, it crashes within a couple of hours on the secondary system.

Expected behavior

dhcpd does not crash.

Environment:

  • ISC DHCP version: 4.4.1 as packaged by Ubuntu (4.4.1-2.1ubuntu5) or 4.4.2 with the same Ubuntu patches as 4.4.1-2.1ubuntu5
  • OS: Ubuntu 20.04 x64

The version from 18.04, 4.3.5-3ubuntu7.1, is fine.

Additional Information

https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1872118 and before that https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1870729

I am not the original reporter of either of those.

Some initial questions

Contacting you

Here is fine, or the Ubuntu bug, or rlaager@wiktel.com by email or XMPP. BTW, this item on the template references github, but you're now running your own GitLab instance, so that's probably old.

Edited by Tomek Mrugalski