Users unable to access the system via SSH due to insufficient entropy

Issue

• The server is running, but SSH connection attempts are hanging due to insufficient entropy:

SSH Client:

# ping -c2 test.example.com
PING test.example.com (10.0.0.34) 56(84) bytes of data.
64 bytes from 10.0.0.34: icmp_seq=1 ttl=60 time=50.2 ms
64 bytes from 10.0.0.34: icmp_seq=2 ttl=60 time=58.6 ms

--- test.example.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 50.176/54.403/58.631/4.227 ms

# ssh 10.0.0.34 -v
OpenSSH_9.0p1, OpenSSL 3.0.9 30 May 2023
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Reading configuration data /etc/ssh/ssh_config.d/50-redhat.conf
debug1: Reading configuration data /etc/crypto-policies/back-ends/openssh.config
..
debug1: Connection established.
debug1: Local version string SSH-2.0-OpenSSH_9.0
(connection hangs)

SSH Server:

# for i in `pidof sshd` ; do egrep "Name|^Pid" /proc/$i/status ; cat /proc/$i/stack ; done
Name:   sshd
Pid:    30133
[<0>] _random_read.part.30+0x314/0x390
[<0>] do_syscall_64+0x5b/0x1a0
[<0>] entry_SYSCALL_64_after_hwframe+0x66/0xcb