flake: TestAgent_Dial/UDP

[matifali]

Seen in: https://github.com/coder/coder/actions/runs/7079511156/job/19266225907#step:5:316

[mafredri]

Closing this via coder/coder#11013, even though it's unclear if it fixes it. Let's reopen if this is continues to be a problem.

[matifali]

Seen again in on main: https://github.com/coder/coder/actions/runs/7222929497/job/19680944167#step:5:1125

[mafredri]

@matifali that looks like a different error, but I don't mind re-opening 👍🏻

[kylecarbs]

Closing because of inactivity!

[dannykopping]

Seen afresh in https://github.com/coder/coder/actions/runs/14616973208/job/41007346459

    agent_test.go:2206: 
        	Error Trace:	/Users/runner/work/coder/coder/agent/agent_test.go:2843
        	            				/Users/runner/work/coder/coder/agent/agent_test.go:2819
        	            				/Users/runner/work/coder/coder/agent/agent_test.go:2206
        	Error:      	Received unexpected error:
        	            	read udp [fd7a:115c:a1e0:435c:b74c:758f:f6ed:fe12]:30563: i/o timeout
        	Test:       	TestAgent_Dial/UDP
        	Messages:   	read payload
    agent_test.go:2206: 
        	Error Trace:	/Users/runner/work/coder/coder/agent/agent_test.go:2844
        	            				/Users/runner/work/coder/coder/agent/agent_test.go:2819
        	            				/Users/runner/work/coder/coder/agent/agent_test.go:2206
        	Error:      	Not equal: 
        	            	expected: 16
        	            	actual  : 0
        	Test:       	TestAgent_Dial/UDP
        	Messages:   	read payload length does not match
    agent_test.go:2206: 
        	Error Trace:	/Users/runner/work/coder/coder/agent/agent_test.go:2845
        	            				/Users/runner/work/coder/coder/agent/agent_test.go:2819
        	            				/Users/runner/work/coder/coder/agent/agent_test.go:2206
        	Error:      	Not equal: 
        	            	expected: []byte{0x64, 0x65, 0x61, 0x6e, 0x2d, 0x77, 0x61, 0x73, 0x2d, 0x68, 0x65, 0x72, 0x65, 0x31, 0x32, 0x33}
        	            	actual  : []byte{}
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1,3 +1,2 @@
        	            	-([]uint8) (len=16) {
        	            	- 00000000  64 65 61 6e 2d 77 61 73  2d 68 65 72 65 31 32 33  |dean-was-here123|
        	            	+([]uint8) {
        	            	 }
        	Test:       	TestAgent_Dial/UDP

Not sure if this is the same issue as before since the runs no longer exist; I'm happy to create a new issue if you prefer.