fix: deep copy status in translator layer to avoid race by rudrakhp · Pull Request #8778 · envoyproxy/gateway

rudrakhp · 2026-04-17T09:17:16Z

What type of PR is this?

fix: deep copy status in translator layer to avoid race

What this PR does / why we need it:
DeepCopy() calls were removed in #6940 but are required to avoid race between deepEqual() in watchable coalesce routine and status updates in gateway api translator routine. Replaced plain shallow copy with deep copy only status.

Also includes a minor spelling fix SeverOptions -> ServerOptions

Which issue(s) this PR fixes:

Fixes #8771

Release Notes: Yes

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chatgpt-codex-connector · 2026-04-17T09:22:10Z


-	for _, policy := range envoyPatchPolicies {
+	for i, orig := range envoyPatchPolicies {
+		envoyPatchPolicies[i] = deepCopyEnvoyPatchPolicyStatus(orig)


Avoid mutating shared EnvoyPatchPolicies slice in place

Writing the deep-copied pointer back into envoyPatchPolicies[i] still mutates the snapshot object passed from GatewayAPIResources. If a new provider update arrives while translation is running, watchable’s equality/coalescing path can read that same slice concurrently, so this assignment can still trigger the control-plane race the patch is trying to eliminate. Keep the copy in a local variable and do not modify the input slice.

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chatgpt-codex-connector · 2026-04-17T09:22:10Z

-		policy := &policy
+		// Clone the Object map to avoid racing with the watchable coalesce goroutine.
+		policy.Object = maps.Clone(policy.Object)
+		policies[policyIndex] = policy


Stop writing cloned extension policies into input slice

policies[policyIndex] = policy mutates the shared resources.ExtensionServerPolicies snapshot before translation completes. During concurrent updates, watchable can deep-compare that same slice in another goroutine, so this write can race even after cloning policy.Object. Build status/IR from a local copied policy and leave the incoming slice unchanged.

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codecov · 2026-04-17T09:29:23Z

Codecov Report

❌ Patch coverage is 98.74214% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.39%. Comparing base (d80fb5b) to head (e8199ae).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/gatewayapi/extensionserverpolicy.go	87.50%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8778      +/-   ##
==========================================
+ Coverage   74.35%   74.39%   +0.04%     
==========================================
  Files         245      245              
  Lines       38847    38951     +104     
==========================================
+ Hits        28883    28978      +95     
- Misses       7963     7969       +6     
- Partials     2001     2004       +3

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zirain · 2026-04-17T09:35:28Z

+// Status is mutated during translation and shares a pointer with the watchable coalesce goroutine.
+func deepCopyBackendStatus(in *egv1a1.Backend) *egv1a1.Backend {
+	out := *in
+	in.Status.DeepCopyInto(&out.Status)


why not use backend.DeepCopy directly? which is better for understanding.

It is less efficient than this as we only need deep copy for status which is modified. Rest of the policy can be a shallow copy. We were already doing complete deep copy before #6940 tried to optimize it.

jukie · 2026-04-18T16:28:08Z

/retest

arkodg · 2026-04-19T03:15:07Z

 				policy, found := handledPolicies[policyName]
 				if !found {
-					policy = currPolicy
+					policy = deepCopySecurityPolicyStatus(currPolicy)


cant we just do it once in L142 ?

makes sense, creating copies once in XCopiesWithStatusDeepCopy() before reusing them.

Signed-off-by: Rudrakh Panigrahi <rudrakh97@gmail.com>

arkodg

LGTM thanks

* fix json report (#8614) Signed-off-by: Huabing (Robin) Zhao <zhaohuabing@gmail.com> Signed-off-by: Rudrakh Panigrahi <rudrakh97@gmail.com> * fix: deep copy status in translator layer to avoid race (#8778) Signed-off-by: Rudrakh Panigrahi <rudrakh97@gmail.com> * chore: setup translator test (#7627) * chore: setup gatewayapi translator test Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * remove: duplicate resources in testfiles Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * update gatewayapi test output Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> --------- Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> Signed-off-by: Rudrakh Panigrahi <rudrakh97@gmail.com> * perf: introduce translator context (#7535) * perf: introduce translator context Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * perf: add policy map in translator context Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * chore: update tranlate bench Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * Revert "perf: add policy map in translator context" This reverts commit 14a3784. Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * add translator context method, remove unused function Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * update gatewayapi test output Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * add resources in translator context Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * add gatewayapi translate bench Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * fix: set resources in translator context Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * fix: go lint Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * address comments Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * feat: support egctl translate options Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * update: bench test Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * update embedded field Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> * fix gatewayapi testdata output Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> --------- Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> Co-authored-by: zirain <zirain2009@gmail.com> Signed-off-by: Rudrakh Panigrahi <rudrakh97@gmail.com> * fix gen-check Signed-off-by: Rudrakh Panigrahi <rudrakh97@gmail.com> --------- Signed-off-by: Huabing (Robin) Zhao <zhaohuabing@gmail.com> Signed-off-by: Rudrakh Panigrahi <rudrakh97@gmail.com> Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com> Co-authored-by: Huabing (Robin) Zhao <zhaohuabing@gmail.com> Co-authored-by: Kota Kimura <86363983+kkk777-7@users.noreply.github.com> Co-authored-by: zirain <zirain2009@gmail.com>

) Signed-off-by: Rudrakh Panigrahi <rudrakh97@gmail.com> Signed-off-by: Jake Oliver <jake@truelayer.com>

rudrakhp requested a review from a team as a code owner April 17, 2026 09:17

rudrakhp force-pushed the translator_coalesce_race branch from cc8f6c8 to 99a5c61 Compare April 17, 2026 09:18

chatgpt-codex-connector Bot reviewed Apr 17, 2026

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rudrakhp force-pushed the translator_coalesce_race branch 2 times, most recently from c64694a to dc37ca3 Compare April 17, 2026 10:39

rudrakhp requested review from a team and zirain April 17, 2026 11:14

rudrakhp added cherrypick/release-v1.6.7 cherrypick/release-v1.7.3 labels Apr 17, 2026

rudrakhp force-pushed the translator_coalesce_race branch from b0b74a1 to dbc7ecb Compare April 18, 2026 06:35

arkodg reviewed Apr 19, 2026

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rudrakhp force-pushed the translator_coalesce_race branch from 52c3850 to 923e3b6 Compare April 19, 2026 07:41

fix: deep copy status in translator layer to avoid race

e8199ae

Signed-off-by: Rudrakh Panigrahi <rudrakh97@gmail.com>

rudrakhp force-pushed the translator_coalesce_race branch from 923e3b6 to e8199ae Compare April 19, 2026 13:45

rudrakhp requested a review from arkodg April 19, 2026 13:56

arkodg approved these changes Apr 19, 2026

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zirain approved these changes Apr 19, 2026

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zirain merged commit 3f70a89 into envoyproxy:main Apr 19, 2026
80 of 85 checks passed

skos-ninja pushed a commit to skos-ninja/envoy-gateway that referenced this pull request May 1, 2026

fix: deep copy status in translator layer to avoid race (envoyproxy#8778

cd1ab4e

) Signed-off-by: Rudrakh Panigrahi <rudrakh97@gmail.com> Signed-off-by: Jake Oliver <jake@truelayer.com>

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fix: deep copy status in translator layer to avoid race#8778

fix: deep copy status in translator layer to avoid race#8778
zirain merged 1 commit intoenvoyproxy:mainfrom
rudrakhp:translator_coalesce_race

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