From 5745ff79129d3fc9bbf511dd24c1232584bfe595 Mon Sep 17 00:00:00 2001
From: Spike Curtis <spike@coder.com>
Date: Fri, 13 Mar 2026 12:50:39 -0400
Subject: [PATCH] test: log DERP debug in CI (#23041)
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related to: https://github.com/coder/internal/issues/1387

Sometimes our tests using DERP flake like the above, but we have no information at the DERP layer about why. This enables verbose DERP logging in CI.

Logs are kinda spammy, but most tests do not force DERP and so only use it for discovery (disco).

A test like TestWorkspaceAgentListeningPorts/OK_BlockDirect drops around 50 DERP packets e.g.

```
    t.go:111: 2026-03-13 15:20:52.201 [debu]  agent.net.tailnet.net.wgengine: magicsock: got derp-999 packet: "\x04\x00\x00\x00C}\xe0\xb9\x00\x00\x00\x00\x00\x00\x00\x00}\xae;l\xd9Hk8\xa8l\x1cK\xedO{狦)\x18NIw\xc4k\xd2-\x19\xbf\xfb\xdd\x17\xa9b\xac\xfd#\xf7\xcaC\xbe\vq(u=\xa7\x16\xe9\x9aLjS\x1fXL\x19y\xf4\x1dE%\xb3\xff\x9d:8\xa9\x95X\xfe\xf8\x95\x7f\x9dv$\f\xf4\xbe"
    t.go:111: 2026-03-13 15:20:52.201 [debu]  agent.net.tailnet.net.wgengine: magicsock: got derp-999 packet: "\x04\x00\x00\x00C}\xe0\xb9\x01\x00\x00\x00\x00\x00\x00\x00\x05x\xb6RD;\xb4\x80\xb6\x0f\xf6KŠc\xfb1\xbd\x06\xb70K3\x97`\x8d\xd2\x14\xed\xc5\xd6\xc6\xcaV\xbf\x878\xb2Ƥ\xf0\xd5\xf7\xc0\x1b\x9f\x04Y\x03\x17\xd4\x06\xee\xb2G\r){\x9f\xde\xe0(\xb5N\xfejR_\xf6q\xa4\xfaT\x9a\xd8\xcbk\xba\x16K"
    t.go:111: 2026-03-13 15:20:52.201 [debu]  agent.net.tailnet.net.wgengine: magicsock: got derp-999 packet: "\x04\x00\x00\x00C}\xe0\xb9\x02\x00\x00\x00\x00\x00\x00\x00\x1e\x93a\x15\xfev\x81'\xa9?\xe8nR\xce<\x91\x86\xcau@\xb9\xcfɩ\xef\xd1眓\x95\xf3*X^7\x99\x88\xb0|\x8cS\xe4@[\x16\xda\xca\xd4\xd9\x1dP\xd0\xfe\xd9r\x8c\xfcp~dP\xfaK\xe0\xf9y\xb2\x11\x15\xfe\xdcx鷽\xdeF\xf7\x92\xe8"

```
---
 .github/actions/test-go-pg/action.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.github/actions/test-go-pg/action.yaml b/.github/actions/test-go-pg/action.yaml
index e0012dd46f..ad409cd700 100644
--- a/.github/actions/test-go-pg/action.yaml
+++ b/.github/actions/test-go-pg/action.yaml
@@ -64,6 +64,7 @@ runs:
         TEST_PACKAGES: ${{ inputs.test-packages }}
         RACE_DETECTION: ${{ inputs.race-detection }}
         TS_DEBUG_DISCO: "true"
+        TS_DEBUG_DERP: "true"
         LC_CTYPE: "en_US.UTF-8"
         LC_ALL: "en_US.UTF-8"
       run: |