fix(nfsproxy): deflake TestRoundTrip EADDRINUSE

[ValentaTomas]

Summary

TestRoundTrip in pkg/nfsproxy fails intermittently with bind: address already in use (e.g. on PR #2985). The go-nfs-client library binds a random ephemeral local port when dialing and only retries EADDRINUSE collisions for privileged dials, so non-privileged dials flake on port collisions. Retry the dials in the test on EADDRINUSE.

[gemini-code-assist]

Code Review

This pull request introduces a dialRetry helper function in proxy_test.go to retry dialing when encountering syscall.EADDRINUSE errors, resolving potential ephemeral port collisions during NFS client tests. No issues or critical findings were identified, and there is no additional feedback to provide.

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[codecov]

❌ 3 Tests Failed:

Tests completed	Failed	Passed	Skipped
2793	3	2790	7

View the full list of 3 ❄️ flaky test(s)

github.com/e2b-dev/infra/tests/integration/internal/tests/api/sandboxes::TestSandboxListPaginationRunningLargerLimit

Flake rate in main: 37.67% (Passed 1034 times, Failed 625 times)

Stack Traces | 97.7s run time

=== RUN   TestSandboxListPaginationRunningLargerLimit
    sandbox_list_test.go:327: Created sandbox 1/12: ioai2fm17e18w8whx1axm
    sandbox_list_test.go:327: Created sandbox 2/12: igpvku6qp3x1am309elbr
    sandbox_list_test.go:327: Created sandbox 3/12: ix3ap8sacuyrbgvypen1w
    sandbox_list_test.go:327: Created sandbox 4/12: igg39lxhgc7s8x8tlfcun
    sandbox_list_test.go:327: Created sandbox 5/12: ib6k0hwi9f09yv8qs6jfq
    sandbox_list_test.go:327: Created sandbox 6/12: io0omwlbe9obnx3gx37rm
    sandbox_list_test.go:327: Created sandbox 7/12: i0vyu7b9n3tm3w7wskblb
    sandbox_list_test.go:327: Created sandbox 8/12: il76gdx1x60a8jq59dyen
    sandbox_list_test.go:327: Created sandbox 9/12: i61v4mtf5x0k1j7lzx819
    sandbox_list_test.go:327: Created sandbox 10/12: izvqglsnk582c88i7xpkp
    sandbox_list_test.go:327: Created sandbox 11/12: ijnh1g9ly508imzwvizpw
    sandbox_list_test.go:327: Created sandbox 12/12: i40cn7k18yg357ld2ax3b
    sandbox_list_test.go:330: 
        	Error Trace:	.../api/sandboxes/sandbox_list_test.go:340
        	            				.../hostedtoolcache/go/1.26.3.../src/runtime/asm_amd64.s:1771
        	Error:      	"[]" should have 12 item(s), but has 0
    sandbox_list_test.go:330: 
        	Error Trace:	.../api/sandboxes/sandbox_list_test.go:330
        	Error:      	Condition never satisfied
        	Test:       	TestSandboxListPaginationRunningLargerLimit
--- FAIL: TestSandboxListPaginationRunningLargerLimit (97.69s)

github.com/e2b-dev/infra/tests/integration/internal/tests/orchestrator::TestSandboxMemoryIntegrity

Flake rate in main: 52.45% (Passed 1027 times, Failed 1133 times)

Stack Traces | 63.4s run time

=== RUN   TestSandboxMemoryIntegrity
=== PAUSE TestSandboxMemoryIntegrity
=== CONT  TestSandboxMemoryIntegrity
    sandbox_memory_integrity_test.go:27: Build completed successfully
--- FAIL: TestSandboxMemoryIntegrity (63.35s)

github.com/e2b-dev/infra/tests/integration/internal/tests/orchestrator::TestSandboxMemoryIntegrity/tmpfs_hash

Flake rate in main: 52.45% (Passed 1017 times, Failed 1122 times)

Stack Traces | 194s run time

=== RUN   TestSandboxMemoryIntegrity/tmpfs_hash
=== PAUSE TestSandboxMemoryIntegrity/tmpfs_hash
=== CONT  TestSandboxMemoryIntegrity/tmpfs_hash
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{start:{pid:1259}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stdout:"Total memory: 985 MB\nUsed memory before tmpfs mount: 188 MB\nFree memory before tmpfs mount: 796 MB\nMemory to use in integrity test (60% of free, min 64MB): 477 MB\n"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"477+0 records in\n477+0 records out\n500170752 bytes (500 MB, 477 MiB) copied, 2.20782 s, 227 MB/s\n"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"\tCommand being timed: \"dd if=/dev/urandom of=/mnt/testfile bs=1M count=477\"\n\tUser time (seconds): 0.00\n\tSystem time (seconds): 2.19\n\tPercent of CPU this job got: 99%\n\tElapsed (wall clock) time (h:mm:ss or m:ss): 0:02.21\n\tAverage shared text size (kbytes): 0\n\tAverage unshared data size (kbytes): 0\n\tAverage stack size (kbytes): 0\n\tAverage total size (kbytes): 0\n\tMaximum resident set size (kbytes): 2652\n\tAverage resident set size (kbytes): 0\n\tMajor (requiring I/O) page faults: 2\n\tMinor (reclaiming a frame) page faults: 341\n\tVoluntary context switches: 3\n\tInvoluntary context switches: 8\n\tSwaps: 0\n\tFile system inputs: 176\n\tFile system outputs: 0\n\tSocket messages sent: 0\n\tSocket messages received: 0\n\tSignals delivered: 0\n\tPage size (bytes): 4096\n\tExit status: 0\n"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stdout:"Used memory after tmpfs mount and file fill: 668 MB\n"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{end:{exited:true status:"exit status 0"}}
    sandbox_memory_integrity_test.go:70: Command [bash] completed successfully in sandbox iqtyhpgutkgtrmjqwj5j4
Executing command bash in sandbox iqtyhpgutkgtrmjqwj5j4 (user: root)
    sandbox_memory_integrity_test.go:80: Command [bash] output: event:{start:{pid:1275}}
Executing command bash in sandbox ikj0hxq2ty5nofm103z0e (user: root)
    sandbox_memory_integrity_test.go:80: Command [bash] output: event:{data:{stdout:"14f6b201f78eb330b9a4d773f41b0269d38c8e413f377eccd94f381aae515898\n"}}
    sandbox_memory_integrity_test.go:80: Command [bash] output: event:{end:{exited:true status:"exit status 0"}}
    sandbox_memory_integrity_test.go:80: Command [bash] completed successfully in sandbox iqtyhpgutkgtrmjqwj5j4
    sandbox_memory_integrity_test.go:80: Command [bash] output: event:{start:{pid:1278}}
Executing command bash in sandbox iqtyhpgutkgtrmjqwj5j4 (user: root)
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    sandbox_memory_integrity_test.go:110: 
        	Error Trace:	.../tests/orchestrator/sandbox_memory_integrity_test.go:81
        	            				.../hostedtoolcache/go/1.26.3.../src/runtime/asm_amd64.s:1771
        	Error:      	Received unexpected error:
        	            	failed to execute command bash in sandbox iqtyhpgutkgtrmjqwj5j4: unavailable: HTTP status 502 Bad Gateway
    sandbox_memory_integrity_test.go:110: 
        	Error Trace:	.../tests/orchestrator/sandbox_memory_integrity_test.go:78
        	            				.../tests/orchestrator/sandbox_memory_integrity_test.go:110
        	Error:      	Condition never satisfied
        	Test:       	TestSandboxMemoryIntegrity/tmpfs_hash
--- FAIL: TestSandboxMemoryIntegrity/tmpfs_hash (194.29s)

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[cursor]

PR Summary

Low Risk
Test-only change with no production behavior impact.

Overview
TestRoundTrip was failing intermittently when the NFS client library picked an ephemeral local port that was already in use, because non-privileged dials are not retried on that error. The test now retries portmap and NFS TCP dials up to five times when the error is EADDRINUSE, so parallel CI runs are less likely to flake on bind collisions.

^{Reviewed by Cursor Bugbot for commit 6dd1f2a. Bugbot is set up for automated code reviews on this repo. Configure here.}