Add compile-time fault-injection infrastructure for stack-walker recovery paths by zhengyu123 · Pull Request #661 · DataDog/java-profiler

zhengyu123 · 2026-07-15T18:37:15Z

What does this PR do?:
Adds a compile-time fault-injection layer that deliberately corrupts pointers at the profiler's real memory-access sites so the existing recovery paths (SafeAccess safefetch and walkVM's setjmp/longjmp) are exercised continuously under test. Entirely gated behind FAULT_INJECTION: when the flag is absent every construct is a strict identity/no-op with zero runtime cost, so production release/debug/asan/tsan builds are unaffected.

To build fault-injected binaries, add -PenableFaultInjection flag to the command line, e.g.

./gradlew -PenableFaultInjection  clean builddebug

Motivation:

Additional Notes:

What's included

Core layer (new files)

faultInjection.h — three probability tiers as integer xorshift thresholds (RARE 0.01%, UNLIKELY 0.1%, LIKELY 1%) and the INJECT_FAULT_{ADDRESS,INT,LONG}_{RARE,UNLIKELY,LIKELY} macros. When the flag is off, each macro is a strict identity ((ptr)/(v)).
faultInjection.cpp — PRNG, PROT_NONE guard-region setup, and poisonAddress() (mix of a mmap'd guard-page pointer and random non-canonical addresses).

Per-thread PRNG
threadLocalData.h — per-thread xorshift64 state in ProfiledThread (async-signal-safe), with a global atomic fallback.
Injection sites (wrap the dereferenced pointer)
stackWalker.cpp — walkFP / walkDwarf SafeAccess loads (LIKELY) → safefetch recovery.
hotspot/hotspotSupport.cpp — walkVM raw derefs (UNLIKELY) → setjmp/longjmp recovery.
hotspot/vmStructs.h — VMStructs::at() (RARE).
profiler.cpp — calls faultinj::init() at signal-handler setup.
Counters (counters.h, live under -DCOUNTERS)
safecopy_failed, safefetch_failed, faults_injected, walkvm_longjmp_recovered — instrument the recovery mechanisms so injection activity and each recovery route are observable.
Build wiring

-PenableFaultInjection appends -D__FAULT_INJECTION__ to the standard release/debug library builds (so buildDebug/buildRelease produce a fault-injected libjavaProfiler.so) and to the gtest build. Deliberately not applied to asan/tsan/fuzzer, which install their own SIGSEGV interception.

Tests
faultInjection_ut.cpp — disabled-path identity checks (default build) plus enabled-path tier-rate bands and SafeAccess/walkVM recovery tests (-PenableFaultInjection).

How to test the change?:

./gradlew :ddprof-lib:gtestDebug_faultInjection_ut -PenableFaultInjection — 6 enabled cases pass.
./gradlew :ddprof-lib:gtestDebug_faultInjection_ut (default) — 2 identity cases pass.
./gradlew -PenableFaultInjection :ddprof-lib:assembleDebug — verified faultinj::* symbols present (.symtab; hidden visibility, not exported).

For Datadog employees:

If this PR touches code that signs or publishes builds or packages, or handles
credentials of any kind, I've requested a security review (run the dd:platform-security-review
skill, or file a request via the PSEC review form).
bewaire also runs automatically on every PR.
This PR doesn't touch any of that.
JIRA: PROF-15401

Unsure? Have a question? Request a review!

dd-octo-sts · 2026-07-15T18:55:46Z

CI Test Results

Run: #29506661506 | Commit: 2fdca40 | Duration: 14m 53s (longest job)

✅ All 32 test jobs passed

Status Overview

JDK	glibc-aarch64/debug	glibc-amd64/debug	musl-aarch64/debug	musl-amd64/debug
8	-	✅	-	-
8-ibm	-	✅	-	-
8-j9	✅	✅	-	-
8-librca	-	-	✅	✅
8-orcl	-	✅	-	-
11	-	✅	-	-
11-j9	✅	✅	-	-
11-librca	-	-	✅	✅
17	✅	✅	-	-
17-graal	✅	✅	-	-
17-j9	✅	✅	-	-
17-librca	-	-	✅	✅
21	✅	✅	-	-
21-graal	✅	✅	-	-
21-librca	-	-	✅	✅
25	✅	✅	-	-
25-graal	✅	✅	-	-
25-librca	-	-	✅	✅

Legend: ✅ passed | ❌ failed | ⚪ skipped | 🚫 cancelled

Summary: Total: 32 | Passed: 32 | Failed: 0

Updated: 2026-07-16 14:46:07 UTC

dd-octo-sts · 2026-07-15T20:39:29Z

Benchmark Results (commit `d85f055`)

Pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/benchmarking-platform/-/pipelines/124877517 Commit: d85f055273e38b3bd9ad5a6913516fca7d60a0f2

⚠️ Significant outliers

🔴 future-genetic (JDK 25): runtime +5.5% (2025→2137 ms)

Runtime details (per benchmark × JDK)

Benchmark	JDK	Latest	Dev	Δ (dev vs latest)	Issues L/D
akka-uct	21	✅ 10232 ms (21 iters)	✅ 10166 ms (21 iters)	≈ -0.6% (±11.1%)	— / —
akka-uct	25	✅ 8907 ms (24 iters)	✅ 8929 ms (24 iters)	≈ +0.2% (±9.6%)	— / —
finagle-chirper	21	✅ 5972 ms (33 iters)	✅ 5984 ms (33 iters)	≈ +0.2% (±25.3%)	⚠️ W:3 / ⚠️ W:3
finagle-chirper	25	✅ 5441 ms (36 iters)	✅ 5530 ms (36 iters)	≈ +1.6% (±25%)	⚠️ W:3 / ⚠️ W:4
fj-kmeans	21	✅ 2734 ms (69 iters)	✅ 2707 ms (70 iters)	≈ -1% (±2.7%)	— / —
fj-kmeans	25	✅ 2822 ms (66 iters)	✅ 2833 ms (66 iters)	≈ +0.4% (±2.6%)	— / —
future-genetic	21	✅ 2088 ms (89 iters)	✅ 2087 ms (89 iters)	≈ -0% (±2.7%)	— / —
future-genetic	25	✅ 2025 ms (92 iters)	✅ 2137 ms (87 iters)	🔴 +5.5%	— / —
naive-bayes	21	✅ 1286 ms (134 iters)	✅ 1344 ms (128 iters)	≈ +4.5% (±33%)	— / —
naive-bayes	25	✅ 1010 ms (170 iters)	✅ 1027 ms (166 iters)	≈ +1.7% (±32.1%)	— / —
reactors	21	✅ 16543 ms (15 iters)	✅ 16267 ms (15 iters)	≈ -1.7% (±8%)	— / —
reactors	25	✅ 18414 ms (15 iters)	✅ 18374 ms (15 iters)	≈ -0.2% (±4.2%)	— / —

Internal counter details (ddprof)

ddprof internal counters, latest / dev (✅ = 0, · = unavailable):

Benchmark	JDK	Dropped rec	Dropped jvmti	Dropped trace	Skipped WC	AGCT fail	Unwind fail
akka-uct	21	✅ / ✅	✅ / ✅	✅ / 3	2017 / 2006	✅ / ✅	✅ / ✅
akka-uct	25	✅ / ✅	✅ / ✅	1 / 3	2142 / 2423	✅ / ✅	✅ / ✅
finagle-chirper	21	✅ / ✅	✅ / ✅	5 / 2	8761 / 8937	✅ / ✅	✅ / ✅
finagle-chirper	25	✅ / ✅	✅ / ✅	1 / 4	8332 / 8785	✅ / ✅	✅ / ✅
fj-kmeans	21	✅ / ✅	✅ / ✅	2 / 2	1285 / 1288	✅ / ✅	✅ / ✅
fj-kmeans	25	✅ / ✅	✅ / ✅	2 / 3	1273 / 1302	✅ / ✅	✅ / ✅
future-genetic	21	✅ / ✅	✅ / ✅	✅ / 1	3049 / 3118	✅ / ✅	✅ / ✅
future-genetic	25	✅ / ✅	✅ / ✅	1 / 1	2892 / 2926	✅ / ✅	✅ / ✅
naive-bayes	21	✅ / ✅	✅ / ✅	3 / 6	3506 / 3515	✅ / ✅	✅ / ✅
naive-bayes	25	✅ / ✅	✅ / ✅	4 / 2	3476 / 3495	✅ / ✅	✅ / ✅
reactors	21	✅ / ✅	✅ / ✅	2 / ✅	1758 / 1644	✅ / ✅	✅ / ✅
reactors	25	✅ / ✅	✅ / ✅	✅ / 2	1913 / 1843	✅ / ✅	✅ / ✅

dd-octo-sts · 2026-07-15T20:40:01Z

Reliability & Chaos Results

✅ All reliability & chaos checks passed Pipeline: https://gitlab.ddbuild.io/DataDog/java-profiler/-/pipelines/124877424

Copilot

Pull request overview

This PR introduces an opt-in, compile-time fault-injection layer (__FAULT_INJECTION__) to deliberately corrupt pointer/value reads at real profiler memory-access sites, so existing recovery paths (SafeAccess safefetch and walkVM setjmp/longjmp) are continuously exercised under test without affecting production builds.

Changes:

Added new fault-injection infrastructure (faultInjection.h/.cpp) with tiered probabilities and a per-thread PRNG seed/state.
Wrapped key memory-access sites (stack walker, HotSpot walkVM, VMStructs) with injection macros and added counters to observe injection/recovery activity.
Wired -PenableFaultInjection into native build configurations and gtest builds; added a dedicated gtest suite for enabled/disabled behavior.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
ddprof-lib/src/main/cpp/faultInjection.h	New public fault-injection API/macros gated by `__FAULT_INJECTION__`.
ddprof-lib/src/main/cpp/faultInjection.cpp	New implementation: PRNG, guard-region setup, poison address generation, injected int/long values.
ddprof-lib/src/main/cpp/threadLocalData.h	Adds per-thread xorshift64 RNG state and accessors under `__FAULT_INJECTION__`.
ddprof-lib/src/main/cpp/stackWalker.cpp	Wraps SafeAccess dereference sites with fault-injection macros.
ddprof-lib/src/main/cpp/hotspot/hotspotSupport.cpp	Wraps selected raw walkVM dereferences; increments longjmp recovery counter.
ddprof-lib/src/main/cpp/hotspot/vmStructs.h	Injects faults in `VMStructs::at()` return pointers (rare tier).
ddprof-lib/src/main/cpp/safeAccess.cpp	Adds counter increments on safefetch/safecopy recovery paths.
ddprof-lib/src/main/cpp/profiler.cpp	Initializes fault-injection guard region during signal-handler setup (when enabled).
ddprof-lib/src/main/cpp/counters.h	Adds new counters for safefetch/safecopy failures, injected faults, and walkVM longjmp recovery.
ddprof-lib/src/test/cpp/faultInjection_ut.cpp	New unit tests for disabled identity behavior and enabled fault/recovery behavior.
build-logic/conventions/src/main/kotlin/com/datadoghq/native/config/ConfigurationPresets.kt	Adds `-D__FAULT_INJECTION__` to debug/release when `-PenableFaultInjection` is set.
build-logic/conventions/src/main/kotlin/com/datadoghq/native/gtest/GtestTaskBuilder.kt	Mirrors the fault-injection define into gtest compilation under `-PenableFaultInjection`.

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

 bool SafeAccess::handle_safefetch(int sig, void* context) {
  ucontext_t* uc = (ucontext_t*)context;
  uintptr_t pc = uc->current_pc;
  if ((sig == SIGSEGV || sig == SIGBUS) && uc != nullptr) {
    if (pc == (uintptr_t)safefetch32_impl) {


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dd-octo-sts · 2026-07-16T13:04:44Z

Benchmark Results (commit `f1c6dc1`)

Pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/benchmarking-platform/-/pipelines/124997579 Commit: f1c6dc1111fa56451484355bba2662323b3cd11b

✅ Within expected boundaries

No significant runtime deltas (all within run-to-run noise) and no internal-counter outliers.

Runtime details (per benchmark × JDK)

Benchmark	JDK	Latest	Dev	Δ (dev vs latest)	Issues L/D
akka-uct	21	✅ 10321 ms (21 iters)	✅ 10408 ms (21 iters)	≈ +0.8% (±11%)	— / —
akka-uct	25	✅ 8949 ms (24 iters)	✅ 8862 ms (24 iters)	≈ -1% (±10.1%)	— / —
finagle-chirper	21	✅ 5903 ms (33 iters)	✅ 6000 ms (33 iters)	≈ +1.6% (±25%)	⚠️ W:3 / ⚠️ W:4
finagle-chirper	25	✅ 5459 ms (36 iters)	✅ 5441 ms (36 iters)	≈ -0.3% (±24.4%)	⚠️ W:4 / ⚠️ W:3
fj-kmeans	21	✅ 2733 ms (68 iters)	✅ 2788 ms (67 iters)	≈ +2% (±2.8%)	— / —
fj-kmeans	25	✅ 2821 ms (66 iters)	✅ 2800 ms (66 iters)	≈ -0.7% (±2.6%)	— / —
future-genetic	21	✅ 2046 ms (90 iters)	✅ 2065 ms (90 iters)	≈ +0.9% (±2.6%)	— / —
future-genetic	25	✅ 2064 ms (90 iters)	✅ 2059 ms (90 iters)	≈ -0.2% (±2.7%)	— / —
naive-bayes	21	✅ 1323 ms (130 iters)	✅ 1300 ms (132 iters)	≈ -1.7% (±32.1%)	— / —
naive-bayes	25	✅ 1013 ms (169 iters)	✅ 1005 ms (169 iters)	≈ -0.8% (±31.7%)	— / —
reactors	21	✅ 16153 ms (15 iters)	✅ 16163 ms (15 iters)	≈ +0.1% (±7.9%)	— / —
reactors	25	✅ 18820 ms (15 iters)	✅ 18126 ms (15 iters)	≈ -3.7% (±3.9%)	— / —

Internal counter details (ddprof)

ddprof internal counters, latest / dev (✅ = 0, · = unavailable):

Benchmark	JDK	Dropped rec	Dropped jvmti	Dropped trace	Skipped WC	AGCT fail	Unwind fail
akka-uct	21	✅ / ✅	✅ / ✅	1 / 1	1981 / 2028	✅ / ✅	✅ / ✅
akka-uct	25	✅ / ✅	✅ / ✅	1 / 1	2179 / 2251	✅ / ✅	✅ / ✅
finagle-chirper	21	✅ / ✅	✅ / ✅	2 / 4	8560 / 8427	✅ / ✅	✅ / ✅
finagle-chirper	25	✅ / ✅	✅ / ✅	4 / ✅	8460 / 8385	✅ / ✅	✅ / ✅
fj-kmeans	21	✅ / ✅	✅ / ✅	✅ / 3	1270 / 1249	✅ / ✅	✅ / ✅
fj-kmeans	25	✅ / ✅	✅ / ✅	3 / 2	1284 / 1263	✅ / ✅	✅ / ✅
future-genetic	21	✅ / ✅	✅ / ✅	1 / ✅	2904 / 2824	✅ / ✅	✅ / ✅
future-genetic	25	✅ / ✅	✅ / ✅	2 / 2	2744 / 2801	✅ / ✅	✅ / ✅
naive-bayes	21	✅ / ✅	✅ / ✅	6 / 1	3543 / 3493	✅ / ✅	✅ / ✅
naive-bayes	25	✅ / ✅	✅ / ✅	7 / 1	3479 / 3487	✅ / ✅	✅ / ✅
reactors	21	✅ / ✅	✅ / ✅	2 / ✅	1698 / 1572	✅ / ✅	✅ / ✅
reactors	25	✅ / ✅	✅ / ✅	2 / ✅	1960 / 1824	✅ / ✅	✅ / ✅

dd-octo-sts · 2026-07-16T15:00:04Z

Benchmark Results (commit `b88f34e`)

Pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/benchmarking-platform/-/pipelines/125033402 Commit: b88f34ec8edeb4333ba152c49ebc16c24913e4d0

⚠️ Significant outliers

🔴 fj-kmeans (JDK 25): runtime +3.2% (2774→2864 ms)
🔴 future-genetic (JDK 25): runtime +3% (2079→2142 ms)

Runtime details (per benchmark × JDK)

Benchmark	JDK	Latest	Dev	Δ (dev vs latest)	Issues L/D
akka-uct	21	✅ 10294 ms (21 iters)	✅ 10207 ms (21 iters)	≈ -0.8% (±11.4%)	— / —
akka-uct	25	✅ 8806 ms (24 iters)	✅ 8847 ms (24 iters)	≈ +0.5% (±10.2%)	— / —
finagle-chirper	21	✅ 5993 ms (33 iters)	✅ 5964 ms (33 iters)	≈ -0.5% (±25.4%)	⚠️ W:3 / ⚠️ W:3
finagle-chirper	25	✅ 5507 ms (36 iters)	✅ 5410 ms (36 iters)	≈ -1.8% (±23.7%)	⚠️ W:3 / ⚠️ W:3
fj-kmeans	21	✅ 2746 ms (68 iters)	✅ 2751 ms (68 iters)	≈ +0.2% (±2.7%)	— / —
fj-kmeans	25	✅ 2774 ms (68 iters)	✅ 2864 ms (66 iters)	🔴 +3.2%	— / —
future-genetic	21	✅ 2097 ms (89 iters)	✅ 2095 ms (89 iters)	≈ -0.1% (±2.6%)	— / —
future-genetic	25	✅ 2079 ms (89 iters)	✅ 2142 ms (87 iters)	🔴 +3%	— / —
naive-bayes	21	✅ 1267 ms (135 iters)	✅ 1274 ms (134 iters)	≈ +0.6% (±32.7%)	— / —
naive-bayes	25	✅ 1012 ms (169 iters)	✅ 1007 ms (170 iters)	≈ -0.5% (±31.2%)	— / —
reactors	21	✅ 16315 ms (15 iters)	✅ 16117 ms (15 iters)	≈ -1.2% (±7.6%)	— / —
reactors	25	✅ 18032 ms (15 iters)	✅ 18381 ms (15 iters)	≈ +1.9% (±5.9%)	— / —

Internal counter details (ddprof)

ddprof internal counters, latest / dev (✅ = 0, · = unavailable):

Benchmark	JDK	Dropped rec	Dropped jvmti	Dropped trace	Skipped WC	AGCT fail	Unwind fail
akka-uct	21	✅ / ✅	✅ / ✅	1 / 1	1961 / 1910	✅ / ✅	✅ / ✅
akka-uct	25	✅ / ✅	✅ / ✅	2 / 2	2182 / 2135	✅ / ✅	✅ / ✅
finagle-chirper	21	✅ / ✅	✅ / ✅	4 / 2	8807 / 8361	✅ / ✅	✅ / ✅
finagle-chirper	25	✅ / ✅	✅ / ✅	2 / ✅	8192 / 8209	✅ / ✅	✅ / ✅
fj-kmeans	21	✅ / ✅	✅ / ✅	3 / ✅	1255 / 1265	✅ / ✅	✅ / ✅
fj-kmeans	25	✅ / ✅	✅ / ✅	4 / 2	1301 / 1285	✅ / ✅	✅ / ✅
future-genetic	21	✅ / ✅	✅ / ✅	1 / 3	2941 / 2957	✅ / ✅	✅ / ✅
future-genetic	25	✅ / ✅	✅ / ✅	2 / 2	2834 / 2878	✅ / ✅	✅ / ✅
naive-bayes	21	✅ / ✅	✅ / ✅	✅ / ✅	✅ / ✅	✅ / ✅	✅ / ✅
naive-bayes	25	✅ / ✅	✅ / ✅	5 / 5	3488 / 3503	✅ / ✅	✅ / ✅
reactors	21	✅ / ✅	✅ / ✅	1 / 2	1714 / 1536	✅ / ✅	✅ / ✅
reactors	25	✅ / ✅	✅ / ✅	✅ / 1	1876 / 1844	✅ / ✅	✅ / ✅

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datadog-datadog-prod-us1 · 2026-07-16T16:42:12Z

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zhengyu123 added 2 commits July 14, 2026 15:13

Investigate and implement fault injection for Java profiler

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Merge branch 'main' into zgu/fault-injection

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Add counters

d85f055

zhengyu123 changed the title ~~Investigate and implement fault injection for Java profiler~~ Add compile-time fault-injection infrastructure for stack-walker recovery paths Jul 15, 2026

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zhengyu123 and others added 3 commits July 16, 2026 14:30

Potential fix for pull request finding

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Benchmark Results (commit d85f055)

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Benchmark Results (commit f1c6dc1)

✅ Within expected boundaries

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Benchmark Results (commit b88f34e)

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Benchmark Results (commit `d85f055`)

Benchmark Results (commit `f1c6dc1`)

Benchmark Results (commit `b88f34e`)