v0.107.1 [error] handling tcp: setting deadline: set tcp 172.17.0.2:853: use of closed network connection

[r0bj]

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Prerequisites

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• I am running the latest version
• I checked the documentation and found no answer
• I checked to make sure that this issue has not already been filed

Issue Details

• Version of AdGuard Home server:
  v0.107.1
• How did you install AdGuard Home:
  docker
• How did you setup DNS configuration:
  system
• CPU architecture:
  AMD64
• Operating system and version:
  Ubuntu 20.04.3

Expected Behavior

AdGuardHome resolves DNS names and error logs are not generated.

Actual Behavior

AdGuardHome stopped resolving DNS names and error logs are generated:

2021/12/29 18:43:10.501746 [error] handling tcp: setting deadline: set tcp 172.17.0.2:853: use of closed network connection
2021/12/29 18:43:10.501750 [error] handling tcp: setting deadline: set tcp 172.17.0.2:853: use of closed network connection
2021/12/29 18:43:10.501754 [error] handling tcp: setting deadline: set tcp 172.17.0.2:853: use of closed network connection
2021/12/29 18:43:10.501758 [error] handling tcp: setting deadline: set tcp 172.17.0.2:853: use of closed network connection
2021/12/29 18:43:10.501762 [error] handling tcp: setting deadline: set tcp 172.17.0.2:853: use of closed network connection
2021/12/29 18:43:10.501766 [error] handling tcp: setting deadline: set tcp 172.17.0.2:853: use of closed network connection
2021/12/29 18:43:10.501770 [error] handling tcp: setting deadline: set tcp 172.17.0.2:853: use of closed network connection
2021/12/29 18:43:10.501774 [error] handling tcp: setting deadline: set tcp 172.17.0.2:853: use of closed network connection
2021/12/29 18:43:10.501778 [error] handling tcp: setting deadline: set tcp 172.17.0.2:853: use of closed network connection
2021/12/29 18:43:10.501783 [error] handling tcp: setting deadline: set tcp 172.17.0.2:853: use of closed network connection

Additional Information

AdGuardHome version v0.107.0 works as expected in this case so it seems that v0.107.1 introduced this issue.

[ainar-g]

Thanks for the report! This is probably related to #4042. We're investigating and planning a fix later today.