在Bash函数中通过SSH执行命令时，循环过早结束

Question

当我使用以下代码时，我希望bash迭代$ SSHCMDS中定义的每个命令行。只要我不使用，它就会这样做 使用命令调用SSH的函数。

在第一个命令之后，为什么这个循环会中断？

Current output:
$ ./test.sh 
NoExec: id root
NoExec: date
NoExec: uname
NoExec: notexistingcommand
WithExec: id root
Greetings from inside execmd. CMD is: id root
uid=0(root) gid=0(root) groups=0(root)

Expected output:
$ ./test.sh 
NoExec: id root
NoExec: date
NoExec: uname
NoExec: notexistingcommand
WithExec: id root
Greetings from inside execmd. CMD is: id root
uid=0(root) gid=0(root) groups=0(root)
WithExec: id date
Greetings from inside execmd. CMD is: date
Sat Oct 7 13:06:41 CEST 2017
WithExec: id uname
Greetings from inside execmd. CMD is: uname
Linux
Greetings from inside execmd. CMD is: notexistingcommand
bash: notexistingcommand: command not found
Error executing command!

#!/bin/bash

IP="127.0.0.1"
USER="root"

function execmd {
    echo "Greetings from inside execmd. CMD is: $1"
    local SSHRESULT
    SSHRESULT=$(ssh $USER@$IP "$1")
    if [ $? -ne 0 ]; then
    echo "Error executing command!"
    exit 1
    fi
    echo $SSHRESULT
}

SSHCMDS="id root
date
uname
notexistingcommand"

# nossh
printf '%s\n' "$SSHCMDS" | while IFS= read -r CMD
do
    echo "NoExec:" "$CMD"
done

# withssh
printf '%s\n' "$SSHCMDS" | while IFS= read -r CMD
do
    echo "WithExec:" "$CMD"
    execmd "$CMD"
done