[FRR-10.0.0] Log message on execution of warm-reboot/fast-reboot mgmt_msg_read: got EOF/disconnect

[gpunathilell]

Description

During warm-reboot or fast-reboot with the frr-10.0.0, we get the following error log:
ERR bgp#mgmtd[42]: [X3G8F-PM93W] BE-adapter: mgmt_msg_read: got EOF/disconnect
This is caused during the stop execution in bgp.sh:

sonic-buildimage/files/scripts/bgp.sh

Line 71 in 18efba1

if [[ x"$WARM_BOOT" == x"true" ]] || [[ x"$FAST_BOOT" == x"true" ]]; then

  if [[ x"$WARM_BOOT" == x"true" ]] || [[ x"$FAST_BOOT" == x"true" ]]; then
        debug "Kill zebra first"
        /usr/bin/docker exec -i bgp pkill -9 zebra || [ $? == 1 ]
        /usr/bin/docker exec -i bgp pkill -9 bgpd || [ $? == 1 ]
    fi

When the zebra and bgpd processes are killed we see this error log

Steps to reproduce the issue:

1. Execute warm-reboot or fast-reboot with an image which has frr-10.0.0
2. Error log is seen in syslog