自制systemd服务运行多日后被标记为‘thawing’的问题排查求助

大家好，我遇到了一个奇怪的问题：自己写的systemd服务运行一段时间后，用systemctl status XXX查看时会被标记为**(thawing)**状态，但用htop看明明有多个线程在正常运行。而且不管是Python脚本还是Go编译的二进制程序，都会出现这个情况。

我用systemctl status auto_quote看到的状态示例如下：

[root]# systemctl status auto_quote

● auto_quote.service - run run_quotelive.sh ## <-change run_XXX.sh

Loaded: loaded (/usr/lib/systemd/system/auto_quote.service; enabled; vendor preset: disabled)

Active: active (running) (thawing) since Wed 2023-06-21 15:05:51 CST; 1 months 18 days ago

Main PID: 1765370 (bash)

Tasks: 8 (limit: 5366)

Memory: 56.5M

CGroup: /system.slice/auto_quote.service

├─1765370 /bin/bash /root/run_quotelive.sh ## <-change run_XXX.sh

└─1765372 ./quotelive

对应的systemd服务配置文件/lib/systemd/system/auto_quote.service内容是：

[Unit]
Description=run run_quotelive.sh ## <-change run_XXX.sh
After=network.service

[Service]
Type=simple
ExecStart=/bin/bash /root/run_quotelive.sh ## <-change run_XXX.sh
Restart=on-failure
RestartSec=3
## systemd bears daemon duty

[Install]
WantedBy=multi-user.target

最开始的启动脚本run_quotelive.sh是这样写的，用eval把程序后台运行并输出日志：

# substitute PATH with the desired Abusolute path of the program, binary or script
# substitute COMMAND with the shell command to run the program, binary or script
# i.e. binary/executable named as XXX, change it to ./XXX
# i.e. python3 script named as XXX.py, change it to python3 XXX.py
# the script below would run it at background and leave starting/failing time
# as well as program output( both normal print and errors) into PATH/out.log

cd /root/quotelive
cmd='./quotelive'
newcmd="$cmd &>> out.log"
echo -e '\n'  `date +'%Y/%m/%d %a, %X'`: STARTING - "$cmd" '\n'  >> out.log
eval $newcmd
echo -e '\n'  `date +'%Y/%m/%d %a, %X'`: PROCESS FAILED  >> out.log
exit 5 # make an error exit for service to restart

我以为是后台运行的问题，于是修改了脚本，让程序前台执行，只有异常退出时才记录失败日志并返回错误码让systemd重启：

cd /root/quotelive
cmd='./quotelive'
echo -e '\n'  `date +'%Y/%m/%d %a, %X'`: STARTING - "$cmd" '\n'  >> out.log
$cmd >>out.log 2>&1
if [ $? -ne 0 ]; then
echo -e '\n'  `date +'%Y/%m/%d %a, %X'`: PROCESS FAILED  >> out.log
exit 5 # make an error exit for service to restart
fi

为了测试，我把程序换成了python3 -m http.server 12345这种会持续运行的服务，但问题还是存在——运行一段时间后服务依然会被标记为**(thawing)**。另外我还发现，原本应该重定向到/root/quotelive/out.log的程序输出，居然出现在了systemctl status auto_quote的输出里。

想请教一下，我的systemd服务配置或者启动脚本哪里有问题吗？为什么会出现这种thawing的状态？

备注：内容来源于stack exchange，提问作者George Y