What/why this event happens: Can't write to Linux tun/tap device (tun mode) /dev/net/tun: Input/output error

[Bright Zhao]

Hi, All

Due to some routing rotation purpose, I use crontab to add below info:

0 * * * * echo Subnet = 54.169.128.0/17 >> /etc/tinc/myvpn/hosts/aws_sgp
0 * * * * echo Subnet = 54.169.0.0/17 >> /etc/tinc/myvpn/hosts/aws_sgp
1 * * * * /usr/sbin/tincd -n myvpn -k
1 * * * * /usr/sbin/tincd -n myvpn --debug=3

30 * * * * sed -i '/54.169.128.0\/17/d' /etc/tinc/myvpn/hosts/aws_sgp
30 * * * * sed -i '/54.169.0.0\/17/d' /etc/tinc/myvpn/hosts/aws_sgp
31 * * * * /usr/sbin/tincd -n myvpn -k
31 * * * * /usr/sbin/tincd -n myvpn --debug=3


But after it get runs, the tinc log shows everything fine, but some how it get below error message, is it an accidental error, or is there anything wrong?

Can't write to Linux tun/tap device (tun mode) /dev/net/tun: Input/output error