fix(envd): make /init lock ctx-aware to prevent retry pile-up by ValentaTomas · Pull Request #2702 · e2b-dev/infra

ValentaTomas · 2026-05-17T22:54:06Z

Replaces initLock (sync.Mutex) with semaphore.Weighted(1). Contended /init returns 503 the moment the caller's ctx fires instead of accumulating goroutines + buffered bodies + memguarded token pages behind a non-ctx-aware mutex.

If any /init is stuck inside SetData, the orchestrator's infinite retry loop pushes more callers behind sync.Mutex.Lock(), each holding a copy of the request body and a goroutine. Switch initLock to a buffered channel (capacity 1) and acquire via select on ctx.Done(); on cancellation return 503 so the orchestrator just retries with a stable Timestamp (PostInit is idempotent per #2687) instead of accumulating goroutines server-side.

cursor · 2026-05-17T22:54:12Z

PR Summary

Medium Risk
Touches /init concurrency control and changes failure mode to 503, which can affect init behavior under load or cancellation. Main risk is subtle lock acquisition/timeout semantics causing unexpected retries or partial progress if callers aren’t prepared.

Overview
Swaps the /init handler’s sync.Mutex for a context-aware weighted semaphore and returns 503 when lock acquisition fails (e.g., request cancellation), instead of blocking and letting retries pile up.

Potential issues: Acquire failure is treated uniformly as 503 without logging/diagnostics, and the new behavior may increase retry churn if upstream aggressively retries on 503 while a long SetData is holding the lock. Version is bumped to 0.5.24.

^{Reviewed by Cursor Bugbot for commit b3c2214. Bugbot is set up for automated code reviews on this repo. Configure here.}

codecov · 2026-05-17T22:54:59Z

❌ 11 Tests Failed:

Tests completed	Failed	Passed	Skipped
2622	11	2611	5

View the full list of 11 ❄️ flaky test(s)

github.com/e2b-dev/infra/tests/integration/internal/tests/api/metrics::TestSandboxMetrics

Flake rate in main: 56.54% (Passed 226 times, Failed 294 times)

Stack Traces | 5.37s run time

=== RUN   TestSandboxMetrics
=== PAUSE TestSandboxMetrics
=== CONT  TestSandboxMetrics
    sandbox_metrics_test.go:47: 
        	Error Trace:	.../api/metrics/sandbox_metrics_test.go:47
        	Error:      	Should NOT be empty, but was 0
        	Test:       	TestSandboxMetrics
--- FAIL: TestSandboxMetrics (5.37s)

github.com/e2b-dev/infra/tests/integration/internal/tests/api/metrics::TestTeamMetrics

Flake rate in main: 71.75% (Passed 224 times, Failed 569 times)

Stack Traces | 1.44s run time

=== RUN   TestTeamMetrics
=== PAUSE TestTeamMetrics
=== CONT  TestTeamMetrics
    team_metrics_test.go:61: 
        	Error Trace:	.../api/metrics/team_metrics_test.go:61
        	Error:      	Should be true
        	Test:       	TestTeamMetrics
        	Messages:   	MaxConcurrentSandboxes should be >= 0
--- FAIL: TestTeamMetrics (1.44s)

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

Flake rate in main: 76.83% (Passed 234 times, Failed 776 times)

Stack Traces | 43.9s run time

=== RUN   TestUpdateNetworkConfig
=== PAUSE TestUpdateNetworkConfig
=== CONT  TestUpdateNetworkConfig
--- FAIL: TestUpdateNetworkConfig (43.85s)

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

Flake rate in main: 77.36% (Passed 225 times, Failed 769 times)

Stack Traces | 5.55s run time

=== RUN   TestUpdateNetworkConfig/pause_resume_preserves_allow_internet_access_false
    sandbox_network_update_test.go:372: Command [curl] output: event:{start:{pid:1353}}
    sandbox_network_update_test.go:372: Command [curl] output: event:{end:{exit_code:35 exited:true status:"exit status 35" error:"exit status 35"}}
Executing command curl in sandbox i5oj6l35zt6f8xj32j9vg
    sandbox_network_update_test.go:372: Command [curl] output: event:{start:{pid:1354}}
    sandbox_network_update_test.go:372: Command [curl] output: event:{end:{exit_code:35 exited:true status:"exit status 35" error:"exit status 35"}}
    sandbox_network_update_test.go:391: Command [curl] output: event:{start:{pid:1355}}
    sandbox_network_update_test.go:391: Command [curl] output: event:{data:{stdout:"HTTP/2 302 \r\nx-content-type-options: nosniff\r\nlocation: https://dns.google/\r\ndate: Mon, 18 May 2026 05:59:22 GMT\r\ncontent-type: text/html; charset=UTF-8\r\nserver: HTTP server (unknown)\r\ncontent-length: 216\r\nx-xss-protection: 0\r\nx-frame-options: SAMEORIGIN\r\nalt-svc: h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000\r\n\r\n"}}
    sandbox_network_update_test.go:391: Command [curl] output: event:{end:{exited:true status:"exit status 0"}}
    sandbox_network_update_test.go:391: Command [curl] completed successfully in sandbox i5oj6l35zt6f8xj32j9vg
    sandbox_network_update_test.go:391: 
        	Error Trace:	.../api/sandboxes/sandbox_network_out_test.go:74
        	            				.../api/sandboxes/sandbox_network_update_test.go:60
        	            				.../api/sandboxes/sandbox_network_update_test.go:391
        	Error:      	An error is expected but got nil.
        	Test:       	TestUpdateNetworkConfig/pause_resume_preserves_allow_internet_access_false
        	Messages:   	https://8.8.8.8 should be blocked
--- FAIL: TestUpdateNetworkConfig/pause_resume_preserves_allow_internet_access_false (5.55s)

github.com/e2b-dev/infra/tests/integration/internal/tests/envd::TestBindLocalhost
Flake rate in main: 56.30% (Passed 399 times, Failed 514 times)
Stack Traces | 0s run time
=== RUN   TestBindLocalhost
=== PAUSE TestBindLocalhost
=== CONT  TestBindLocalhost
--- FAIL: TestBindLocalhost (0.00s)

github.com/e2b-dev/infra/tests/integration/internal/tests/envd::TestBindLocalhost/bind_0_0_0_0

Flake rate in main: 63.12% (Passed 222 times, Failed 380 times)

Stack Traces | 7.73s run time

=== RUN   TestBindLocalhost/bind_0_0_0_0
=== PAUSE TestBindLocalhost/bind_0_0_0_0
=== CONT  TestBindLocalhost/bind_0_0_0_0
Executing command /bin/bash in sandbox i0tmilsf4wwyezlmim2bm
    localhost_bind_test.go:69: Command [python] output: event:{start:{pid:1262}}
Executing command python in sandbox ilovdkzvuwbm3p3tksrzb
    localhost_bind_test.go:90: 
        	Error Trace:	.../tests/envd/localhost_bind_test.go:90
        	Error:      	Not equal: 
        	            	expected: 200
        	            	actual  : 502
        	Test:       	TestBindLocalhost/bind_0_0_0_0
        	Messages:   	Unexpected status code 502 for bind address 0.0.0.0
--- FAIL: TestBindLocalhost/bind_0_0_0_0 (7.73s)

github.com/e2b-dev/infra/tests/integration/internal/tests/envd::TestBindLocalhost/bind_127_0_0_1

Flake rate in main: 59.01% (Passed 223 times, Failed 321 times)

Stack Traces | 9.63s run time

=== RUN   TestBindLocalhost/bind_127_0_0_1
=== PAUSE TestBindLocalhost/bind_127_0_0_1
=== CONT  TestBindLocalhost/bind_127_0_0_1
    localhost_bind_test.go:69: Command [python] output: event:{start:{pid:1262}}
    localhost_bind_test.go:90: 
        	Error Trace:	.../tests/envd/localhost_bind_test.go:90
        	Error:      	Not equal: 
        	            	expected: 200
        	            	actual  : 502
        	Test:       	TestBindLocalhost/bind_127_0_0_1
        	Messages:   	Unexpected status code 502 for bind address 127.0.0.1
--- FAIL: TestBindLocalhost/bind_127_0_0_1 (9.63s)

github.com/e2b-dev/infra/tests/integration/internal/tests/envd::TestBindLocalhost/bind_::1

Flake rate in main: 64.48% (Passed 222 times, Failed 403 times)

Stack Traces | 7.18s run time

=== RUN   TestBindLocalhost/bind_::1
=== PAUSE TestBindLocalhost/bind_::1
=== CONT  TestBindLocalhost/bind_::1
Executing command python in sandbox i9pqvp0fmj1ahu0fkwbg7
    localhost_bind_test.go:69: Command [python] output: event:{start:{pid:1262}}
    localhost_bind_test.go:90: 
        	Error Trace:	.../tests/envd/localhost_bind_test.go:90
        	Error:      	Not equal: 
        	            	expected: 200
        	            	actual  : 502
        	Test:       	TestBindLocalhost/bind_::1
        	Messages:   	Unexpected status code 502 for bind address ::1
--- FAIL: TestBindLocalhost/bind_::1 (7.18s)

github.com/e2b-dev/infra/tests/integration/internal/tests/envd::TestBindLocalhost/bind_localhost

Flake rate in main: 64.37% (Passed 222 times, Failed 401 times)

Stack Traces | 7.64s run time

=== RUN   TestBindLocalhost/bind_localhost
=== PAUSE TestBindLocalhost/bind_localhost
=== CONT  TestBindLocalhost/bind_localhost
Executing command python in sandbox imjwy3ztqc461qpl0j1ao
    localhost_bind_test.go:69: Command [python] output: event:{start:{pid:1261}}
    localhost_bind_test.go:90: 
        	Error Trace:	.../tests/envd/localhost_bind_test.go:90
        	Error:      	Not equal: 
        	            	expected: 200
        	            	actual  : 502
        	Test:       	TestBindLocalhost/bind_localhost
        	Messages:   	Unexpected status code 502 for bind address localhost
--- FAIL: TestBindLocalhost/bind_localhost (7.64s)

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

Flake rate in main: 66.18% (Passed 232 times, Failed 454 times)

Stack Traces | 80.5s run time

=== RUN   TestSandboxMemoryIntegrity
=== PAUSE TestSandboxMemoryIntegrity
=== CONT  TestSandboxMemoryIntegrity
    sandbox_memory_integrity_test.go:26: Build completed successfully
--- FAIL: TestSandboxMemoryIntegrity (80.55s)

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

Flake rate in main: 66.87% (Passed 222 times, Failed 448 times)

Stack Traces | 47.5s 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:1253}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stdout:"Total memory: 985 MB\nUsed memory before tmpfs mount: 182 MB\nFree memory before tmpfs mount: 802 MB\nMemory to use in integrity test (80% of free, min 64MB): 641 MB\n"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"641+0 records in\n641+0 records out\n672137216 bytes (672 MB, 641 MiB) copied, 18.0643 s, 37.2 MB/s\n"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"\t"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"C"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"o"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"m"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"m"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"a"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"n"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"d"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:" "}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"b"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"e"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"i"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"n"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"g"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:" "}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"t"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"i"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"m"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"e"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"d"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:":"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:" "}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"\""}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"dd"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:" "}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"if=/dev/urandom of=/mnt/testfile bs=1M count=641\"\n\tUser time (seconds): 0.00\n\tSystem time (seconds): 17.73\n\tPercent of CPU this job got: 98%\n\tElapsed (wall clock) time (h:mm:ss or m:ss): 0:18.07\n\tAverage shared text size (kbytes): 0\n\tAverage unshared data size (kbytes): 0\n\tAverage stack size (kbytes): 0\n\tAverage total size ("}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"k"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"b"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"y"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"t"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"e"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"s"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:")"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:":"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:" "}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"0"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"\n"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"\t"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"M"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"a"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"x"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"i"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"m"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"u"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"m"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:" "}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"r"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"e"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"s"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"i"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"d"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"e"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"n"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"t"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:" "}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"s"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"e"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"t"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:" "}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"s"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"i"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"z"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"e"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:" "}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"("}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"k"}}
    sandbox_memory_integrity_test.go:70: Command [bash] output: event:{data:{stderr:"bytes): 2724\n\tAverage resident set size (kbytes): 0\n\tMajor (requiring I/O) page faults: 2\n\tMinor (reclaiming a frame) page faults: 345\n\tVoluntary context switches: 3\n\tInvoluntary context switches: 237\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: 833 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 ij4x2r6ban30ag034ohgs
Executing command bash in sandbox ij4x2r6ban30ag034ohgs (user: root)
    sandbox_memory_integrity_test.go:74: Command [bash] output: event:{start:{pid:1269}}
    sandbox_memory_integrity_test.go:74: Command [bash] output: event:{data:{stdout:"171afc732b0caf6c67b06a2d3601ee9c3ac7fe5853fb5e57edf0d439eadc3823\n"}}
    sandbox_memory_integrity_test.go:74: Command [bash] output: event:{end:{exited:true status:"exit status 0"}}
    sandbox_memory_integrity_test.go:74: Command [bash] completed successfully in sandbox ij4x2r6ban30ag034ohgs
Executing command bash in sandbox ij4x2r6ban30ag034ohgs (user: root)
    sandbox_memory_integrity_test.go:99: Command [bash] output: event:{start:{pid:1272}}
    sandbox_memory_integrity_test.go:100: 
        	Error Trace:	.../tests/orchestrator/sandbox_memory_integrity_test.go:100
        	Error:      	Received unexpected error:
        	            	failed to execute command bash in sandbox ij4x2r6ban30ag034ohgs: invalid_argument: protocol error: incomplete envelope: unexpected EOF
        	Test:       	TestSandboxMemoryIntegrity/tmpfs_hash
--- FAIL: TestSandboxMemoryIntegrity/tmpfs_hash (47.54s)

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gemini-code-assist

Code Review

This pull request replaces the sync.Mutex with a buffered channel in the PostInit handler to implement context-aware locking, preventing goroutine accumulation during timeouts. The package version is also updated to 0.5.24. I have no feedback to provide.

Orchestrator already logs the failure; doubling up here is noise.

Replaces lockMutexCtx (which spawned a goroutine per acquisition that lingered until lock release) with the same channel-as-mutex pattern #2702 uses for initLock. Foreground respects ctx for lock acquisition only; the actual install work always runs to completion.

cla-bot Bot added the cla-signed label May 17, 2026

e2b-request-same-site-reviewers Bot assigned levb May 17, 2026

gemini-code-assist Bot reviewed May 17, 2026

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ValentaTomas mentioned this pull request May 18, 2026

fix(envd): bound MMDS lookup in /init to prevent initLock starvation #2689

Closed

ValentaTomas marked this pull request as ready for review May 18, 2026 04:58

ValentaTomas requested review from dobrac and jakubno as code owners May 18, 2026 04:58

drop warn log on initLock ctx cancel

c91a0d5

Orchestrator already logs the failure; doubling up here is noise.

ValentaTomas added 2 commits May 17, 2026 22:45

use semaphore.Weighted for initLock

a317ce7

drop redundant initLock comment

b3c2214

jakubno assigned jakubno and unassigned levb May 18, 2026

jakubno approved these changes May 18, 2026

View reviewed changes

jakubno merged commit 173afd4 into main May 18, 2026
54 checks passed

jakubno deleted the fix/envd-init-lock-ctx branch May 18, 2026 09:27

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fix(envd): make /init lock ctx-aware to prevent retry pile-up#2702

fix(envd): make /init lock ctx-aware to prevent retry pile-up#2702
jakubno merged 4 commits into
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fix/envd-init-lock-ctx

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