Public bug reported:
Platform: Qemu/libvirt on AMD64
Ubuntu version: 20.04
isc-dhcp-client version: 4.4.1-2.1ubuntu5
Problem: When dhclient is used during boot every few reboots the DHCP OFFER
packets aren't pushed from the kernel to dhclient. The DISCOVER packets can be
seen in strace and tcpdump. The OFFER packets can be seen in tcpdump, but no
read event is triggered.
Ubuntu 18.04 doesn't have the problem, neither does Debian 10. Building these
dhclient versions on Ubuntu 20.04 alleviates the problem a little, but it still
occurs. So this issue might also be kernel related.
Attached diff shows a strace of all threads and a pcap showing the
tcpdump output.
** Affects: isc-dhcp (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "dhclient strace and pcap"
https://bugs.launchpad.net/bugs/1926139/+attachment/5492409/+files/dhcp.tar.bz2
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https://bugs.launchpad.net/bugs/1926139
Title:
dhclient doesn't receive dhcp offer from kernel
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