Public bug reported:
Ubuntu
==============
No LSB modules are available.
Description: Ubuntu 24.04.2 LTS
Release: 24.04
Package
==============
isc-dhcp-client:
Installed: 4.4.3-P1-4ubuntu2
Candidate: 4.4.3-P1-4ubuntu2
Version table:
*** 4.4.3-P1-4ubuntu2 500
500 http://archive.ubuntu.com/ubuntu noble/universe amd64 Packages
100 /var/lib/dpkg/status
Steps to Reproduce
==================
# ip l add dev dummy type dummy
# ip l set dev dummy up
# for i in {1..50}; do for j in {1..50}; do ip a a 192.168.$i.$j/24 dev dummy;
done; done
# ip -o a show dev dummy | wc -l
2500
# dhclient -v dummy
Result
======
After the operations above, we can see the dhclient hanging. The top command
showed the dhclient's memory
was increasing, seemed a memory leak happened.
top - 01:52:58 up 12 days, 23:38, 0 user, load average: 2.46, 2.44, 2.26
Tasks: 5 total, 1 running, 2 sleeping, 2 stopped, 0 zombie
%Cpu(s): 2.4 us, 1.4 sy, 0.0 ni, 96.1 id, 0.1 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 772016.8 total, 614728.2 free, 111628.2 used, 50758.8 buff/cache
MiB Swap: 0.0 total, 0.0 free, 0.0 used. 660388.6 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 20 0 4.5m 3.8m 3.2m S 0.0 0.0 0:00.00 bash
10 root 20 0 4.6m 4.1m 3.4m S 0.0 0.0 0:00.59 bash
2869 root 20 0 3.2m 1.3m 1.2m T 0.0 0.0 0:00.00 dhclient
2870 root 20 0 188.7m 185.9m 2.3m T 0.0 0.0 2:09.55 dhclient
2879 root 20 0 8.7m 5.0m 2.9m R 0.0 0.0 0:00.00 top
** Affects: isc-dhcp (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2109303
Title:
dhclient hang when tons of ip addresses exist
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