[jarvis9443]

The "GET /debug/pprof/heap returns a symbolized gzipped pprof" case in memory-observability-e2e fails intermittently with no gateway function among N names. This makes that failure negligibly unlikely without loosening what the case checks.

The cause is sampling density, not symbolization. By default the gateway samples one allocation per 2 MiB on average (lg_prof_sample:21 in the binary's _rjem_malloc_conf). A freshly started test gateway has only a few MiB live, so its profile carries 1–7 live samples. Every failing profile I captured had exactly one sample: std's runtime-init Box clone under std::rt::lang_start → std::sys::pal::unix::init. Every location in it resolved to a name, and none was under gateway code. Thread-per-core isn't involved.

Scenario confirmed invalid by a human (2026-10-29): a freshly started gateway at the default 2 MiB sampling interval is not guaranteed to have gateway frames in its heap profile, and that is not a product promise.

So only this case now spawns its own gateway with _RJEM_MALLOC_CONF=lg_prof_sample:16 (64 KiB). Its profile has a few hundred function names, plenty of them under aisix_*. prof:true,prof_active:true still come from the binary; only the interval changes. Every other case in the file stays on the shared gateway at the factory default. The assertions are unchanged.

Because the case now profiles a gateway it just spawned, spawnApp also waits for the debug listener before returning. The gateway binds that listener in its own task, so a request right after spawning could race it, and that applies to every case that hits debugUrl straight away. The gate is a TCP connect rather than a profile request, so it doesn't take a dump or move the dump counters. This is a readiness gate on a startup race I never caught failing, so it has no fail-before test of its own.

A fail-before/pass-after test doesn't apply to a flake fix, so here is the evidence instead. Before: the single case, run 20 times against a local debug build, failed 2 times (10%). After: the same case, run 60 times, failed 0 times, and the whole file passes. The check still catches real breakage. Against a stripped copy of the binary (a genuinely unsymbolized profile) it fails with no gateway function among 4 names. With the matcher pointed at a prefix that doesn't exist, it fails with among 303 names.

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• tests/e2e/src/harness/app.ts

Walkthrough

The manual heap-profile test now uses a dedicated gateway configured with jemalloc profile sampling at lg_prof_sample:16. It checks the gateway’s metrics before and after the profile request and shuts down the gateway in a finally block.

Changes: Memory observability test

Layer / File(s)	Summary
Run profile checks against a dedicated gateway tests/e2e/src/cases/memory-observability-e2e.test.ts	The test requests a profile from a dedicated gateway with denser jemalloc sampling. It checks the metrics, profile contents, and successful manual dump count, then shuts down the gateway in a finally block.

Priority: Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: Low · previous review 97001

The profile test can still fail intermittently at startup; a listener readiness check would stabilize it.

Pre-merge checks: 6

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies the main change: preventing flakes in the heap pprof symbolization end-to-end test.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
E2e Test Quality Review		PASS — The PR is focused and correct. The changed E2E case starts a dedicated gateway with dense jemalloc sampling, exercises the real /debug/pprof/heap endpoint, validates gzip, inuse_space, symb…
Security Check		No security issue is introduced. The only changed file is the E2E test at tests/e2e/src/cases/memory-observability-e2e.test.ts:354-379; it starts a dedicated local gateway with `_RJEM_MALLOC_CONF=lg…

Full details: E2e Test Quality Review

Explanation

PASS — The PR is focused and correct. The changed E2E case starts a dedicated gateway with dense jemalloc sampling, exercises the real /debug/pprof/heap endpoint, validates gzip, inuse_space, symbol names, and the manual-dump metric delta, then always calls dense.exit() in finally. The dedicated app avoids shared-test state and uses unique harness resources. No hidden ordering, mock overuse, ignored errors, or unrelated changes were found.

Full details: Security Check

Explanation

No security issue is introduced. The only changed file is the E2E test at tests/e2e/src/cases/memory-observability-e2e.test.ts:354-379; it starts a dedicated local gateway with _RJEM_MALLOC_CONF=lg_prof_sample:16, reads its pprof and metrics responses, and shuts it down in finally. It does not add production logging, persistence, authorization, ownership, TLS, shared-resource mutation, or secret-reference handling. Category 1: No issues found. Category 2: No issues found. Category 3: No issues found. Category 4: No issues found. Category 5: No issues found. Category 6: No issues found; the dedicated gateway reduces shared-resource interaction. Category 7: No issues found; the environment value is a fixed allocator sampling setting, not a secret reference.

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Inline comments:
Review comments at @tests/e2e/src/cases/memory-observability-e2e.test.ts:
- Line 361: Before the heap profile fetch in the memory observability test, wait
for a bounded TCP connection to dense.debugUrl so the independently starting
debug listener is ready; do not use a profile request as the readiness check.

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