[fault-injection] Profiler::recordSample() stack walk is unprotected by zhengyu123 · Pull Request #680 · DataDog/java-profiler

zhengyu123 · 2026-07-22T12:47:24Z

What does this PR do?:

Motivation:

Additional Notes:

How to test the change?:

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-15447

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Pull request overview

This PR hardens the native profiler’s initialization and stack-walking paths against startup-ordering issues (Agent_OnLoad) and fault/crash scenarios during sampling, and adds a regression test to prevent reintroducing the initialization regression.

Changes:

Add setjmp/longjmp crash protection around Profiler::recordSample()’s stack unwind to avoid unrecoverable faults during metadata reads.
Ensure HotSpot VMStructs initialization happens early enough for the -agentpath: (Agent_OnLoad) path by calling VM::ready() from VM::initProfilerBridge(), and add debug test logging for the decision points.
Add a Java regression test that launches a child JVM with -agentpath: and asserts the DebugNonSafepoints flag lookup path is taken (not the CompiledMethodLoad workaround).

Reviewed changes

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Show a summary per file

File	Description
ddprof-test/src/test/java/com/datadoghq/profiler/JVMAccessTest.java	Adds regression test covering Agent_OnLoad initialization ordering and VM flag detection.
ddprof-lib/src/main/java/com/datadoghq/profiler/LibraryLoader.java	Exposes a package-visible library-path resolver for tests to supply a real `-agentpath:` without loading in-process.
ddprof-lib/src/main/cpp/vmEntry.h	Reworks `_libjvm` handling to a `CodeCache*` with an accessor using acquire semantics.
ddprof-lib/src/main/cpp/vmEntry.cpp	Makes `VM::ready()` idempotently initialize VMStructs once; calls `ready()` from `initProfilerBridge()` for Agent_OnLoad; adds test logs.
ddprof-lib/src/main/cpp/profiler.cpp	Wraps native+Java stack walking in `recordSample()` with crash protection and records an error frame on recovery; switches debug-symbol query to `VM::libjvm()`.
ddprof-lib/src/main/cpp/hotspot/vmStructs.inline.h	Adds safe offset-load helpers and uses `SafeAccess` for VMFlag name reads; introduces fault-injection point for offset access.
ddprof-lib/src/main/cpp/hotspot/vmStructs.h	Moves offset accessors to inline definitions and adds a safe-load template; updates VMFlag::name() signature.
ddprof-lib/src/main/cpp/hotspot/vmStructs.cpp	Avoids repeated unsafe dereferences by caching `VMFlag::name()` into a local before `strcmp`.
ddprof-lib/src/main/cpp/hotspot/hotspotSupport.cpp	Adds a null-check for `scope.method()` and renames the recovered-longjmp counter to be stackwalk-generic.
ddprof-lib/src/main/cpp/flightRecorder.cpp	Switches debug-symbol setting emission to use `VM::libjvm()`.
ddprof-lib/src/main/cpp/counters.h	Renames `WALKVM_LONGJMP_RECOVERED` to `STACKWALK_LONGJMP_RECOVERED`.

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dd-octo-sts · 2026-07-22T13:07:08Z

CI Test Results

Run: #29944756344 | Commit: 2c6b4bc | Duration: 17m 18s (longest job)

❌ 7 of 32 test jobs failed

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

Failed Tests

glibc-aarch64/debug / 11-j9

Job: View logs

No detailed failure information available. Check the job logs.

glibc-aarch64/debug / 17-j9

Job: View logs

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glibc-aarch64/debug / 8-j9

Job: View logs

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glibc-amd64/debug / 8-ibm

Job: View logs

No detailed failure information available. Check the job logs.

glibc-amd64/debug / 8-j9

Job: View logs

No detailed failure information available. Check the job logs.

glibc-amd64/debug / 17-j9

Job: View logs

No detailed failure information available. Check the job logs.

glibc-amd64/debug / 11-j9

Job: View logs

No detailed failure information available. Check the job logs.

Summary: Total: 32 | Passed: 25 | Failed: 7

Updated: 2026-07-22 18:20:40 UTC

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Pull request overview

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dd-octo-sts · 2026-07-22T14:06:37Z

Benchmark Results (commit `3039d1a`)

Pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/benchmarking-platform/-/pipelines/126243478 Commit: 3039d1aaedaee363326bea17a7c8b724984af1b2

⚠️ Significant outliers

🟢 future-genetic (JDK 25): runtime -3.2% (2127→2058 ms)

Runtime details (per benchmark × JDK)

Benchmark	JDK	Latest	Dev	Δ (dev vs latest)	Issues L/D
akka-uct	21	✅ 10098 ms (21 iters)	✅ 10322 ms (21 iters)	≈ +2.2% (±12.1%)	— / —
finagle-chirper	25	✅ 5505 ms (36 iters)	✅ 5467 ms (36 iters)	≈ -0.7% (±24.6%)	⚠️ W:3 / ⚠️ W:3
fj-kmeans	21	✅ 2709 ms (70 iters)	✅ 2752 ms (68 iters)	≈ +1.6% (±2.8%)	— / —
fj-kmeans	25	✅ 2838 ms (66 iters)	✅ 2775 ms (67 iters)	≈ -2.2% (±2.7%)	— / —
future-genetic	21	✅ 2118 ms (88 iters)	✅ 2103 ms (88 iters)	≈ -0.7% (±2.7%)	— / —
future-genetic	25	✅ 2127 ms (88 iters)	✅ 2058 ms (90 iters)	🟢 -3.2%	— / —
naive-bayes	21	✅ 1275 ms (134 iters)	✅ 1299 ms (132 iters)	≈ +1.9% (±32.9%)	— / —
naive-bayes	25	✅ 1026 ms (167 iters)	✅ 1013 ms (169 iters)	≈ -1.3% (±31.2%)	— / —
reactors	21	✅ 17105 ms (15 iters)	✅ 16884 ms (15 iters)	≈ -1.3% (±6.3%)	— / —

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 / ✅	1909 / 1998	✅ / ✅	✅ / ✅
akka-uct	25	✅ / ✅	✅ / ✅	✅ / ✅	2222 / 2288	✅ / ✅	✅ / ✅
finagle-chirper	21	✅ / ✅	✅ / ✅	4 / 2	8808 / 8669	✅ / ✅	✅ / ✅
finagle-chirper	25	✅ / ✅	✅ / ✅	1 / ✅	8595 / 8112	✅ / ✅	✅ / ✅
fj-kmeans	21	✅ / ✅	✅ / ✅	5 / 4	1289 / 1296	✅ / ✅	✅ / ✅
fj-kmeans	25	✅ / ✅	✅ / ✅	3 / 3	1267 / 1292	✅ / ✅	✅ / ✅
future-genetic	21	✅ / ✅	✅ / ✅	✅ / ✅	✅ / ✅	✅ / ✅	✅ / ✅
future-genetic	25	✅ / ✅	✅ / ✅	3 / ✅	2940 / 2869	✅ / ✅	✅ / ✅
naive-bayes	21	✅ / ✅	✅ / ✅	3 / 3	3549 / 3484	✅ / ✅	✅ / ✅
naive-bayes	25	✅ / ✅	✅ / ✅	5 / 4	3503 / 3493	✅ / ✅	✅ / ✅
reactors	21	✅ / ✅	✅ / ✅	✅ / 1	1751 / 1823	✅ / ✅	✅ / ✅
reactors	25	✅ / ✅	✅ / ✅	1 / ✅	1836 / 1828	✅ / ✅	✅ / ✅

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dd-octo-sts · 2026-07-22T15:07:07Z

Reliability & Chaos Results

✅ All reliability & chaos checks passed Pipeline: https://gitlab.ddbuild.io/DataDog/java-profiler/-/pipelines/126327649

…ataDog/java-profiler into zgu/unprotected_stackwalk_recordSample

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Comments suppressed due to low confidence (1)

ddprof-lib/src/main/cpp/vmEntry.cpp:222

Typo in comment: "libaray" -> "library".

  // The libaray must have been loaded. Otherwise, we cannot get to here due
  // to JVM initialization

datadog-official · 2026-07-22T15:30:09Z

Bits has a CI fix ready

🟢 Investigated · 🟢 Fix prepared · ⚪ Validation skipped · 🟠 Ready

Profiler::recordSample left its unwind-recovery branch unclosed, causing following member definitions to be parsed in function scope. Added the missing closing brace in ddprof-lib/src/main/cpp/profiler.cpp.

Commit fix to this PR

View in Datadog | Reviewed commit 4403952 · Any feedback? Reach out in #deveng-pr-agent

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Comments suppressed due to low confidence (1)

ddprof-lib/src/main/cpp/vmEntry.cpp:223

Typo in comment: "libaray" should be "library".

  // The libaray must have been loaded. Otherwise, we cannot get to here due
  // to JVM initialization
  assert(lib != nullptr && "JVM library must be loaded");

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Comments suppressed due to low confidence (1)

ddprof-lib/src/main/cpp/vmEntry.cpp:222

Typo in comment: "libaray" should be "library" (and the sentence can be tightened).

  // The library must have been loaded. Otherwise, we cannot get to here due
  // to JVM initialization

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 TEST(CheckFaultGuardTest, NullThreadIsNoop) {
-    HotspotSupport::checkFault(nullptr);  // must not crash
+    Profiler::checkFault(nullptr);  // must not crash
 }


dd-octo-sts · 2026-07-22T18:32:25Z

Benchmark Results (commit `a66e913`)

Pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/benchmarking-platform/-/pipelines/126327661 Commit: a66e913022c97e8eb8ff017b544a817828030288

⚠️ Significant outliers

🔴 future-genetic (JDK 25): runtime +4.8% (2040→2138 ms)

Runtime details (per benchmark × JDK)

Benchmark	JDK	Latest	Dev	Δ (dev vs latest)	Issues L/D
akka-uct	21	✅ 10146 ms (21 iters)	✅ 10256 ms (21 iters)	≈ +1.1% (±11.4%)	— / —
akka-uct	25	✅ 8891 ms (24 iters)	✅ 8863 ms (24 iters)	≈ -0.3% (±11.1%)	— / —
finagle-chirper	21	✅ 5943 ms (33 iters)	✅ 5983 ms (33 iters)	≈ +0.7% (±25.5%)	⚠️ W:3 / ⚠️ W:3
finagle-chirper	25	✅ 5507 ms (36 iters)	✅ 5417 ms (36 iters)	≈ -1.6% (±24.3%)	⚠️ W:3 / ⚠️ W:4
fj-kmeans	21	✅ 2773 ms (68 iters)	✅ 2772 ms (67 iters)	≈ -0% (±2.7%)	— / —
fj-kmeans	25	✅ 2823 ms (66 iters)	✅ 2779 ms (67 iters)	≈ -1.6% (±2.7%)	— / —
future-genetic	21	✅ 2128 ms (87 iters)	✅ 2093 ms (88 iters)	≈ -1.6% (±2.7%)	— / —
future-genetic	25	✅ 2040 ms (90 iters)	✅ 2138 ms (87 iters)	🔴 +4.8%	— / —
naive-bayes	21	✅ 1323 ms (130 iters)	✅ 1267 ms (135 iters)	≈ -4.2% (±31.9%)	— / —
naive-bayes	25	✅ 1017 ms (168 iters)	✅ 1015 ms (168 iters)	≈ -0.2% (±31.6%)	— / —
reactors	21	✅ 16518 ms (15 iters)	✅ 16995 ms (15 iters)	≈ +2.9% (±6.4%)	— / —
reactors	25	✅ 18203 ms (15 iters)	✅ 18574 ms (15 iters)	≈ +2% (±5.3%)	— / —

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	✅ / ✅	✅ / ✅	4 / 3	1921 / 1981	✅ / ✅	✅ / ✅
akka-uct	25	✅ / ✅	✅ / ✅	2 / 1	2429 / 2360	✅ / ✅	✅ / ✅
finagle-chirper	21	✅ / ✅	✅ / ✅	2 / 4	8337 / 8708	✅ / ✅	✅ / ✅
finagle-chirper	25	✅ / ✅	✅ / ✅	✅ / 2	8615 / 8139	✅ / ✅	✅ / ✅
fj-kmeans	21	✅ / ✅	✅ / ✅	4 / 1	1264 / 1262	✅ / ✅	✅ / ✅
fj-kmeans	25	✅ / ✅	✅ / ✅	1 / ✅	1284 / 1266	✅ / ✅	✅ / ✅
future-genetic	21	✅ / ✅	✅ / ✅	2 / ✅	2972 / 2957	✅ / ✅	✅ / ✅
future-genetic	25	✅ / ✅	✅ / ✅	2 / 3	2870 / 2948	✅ / ✅	✅ / ✅
naive-bayes	21	✅ / ✅	✅ / ✅	3 / 2	3511 / 3493	✅ / ✅	✅ / ✅
naive-bayes	25	✅ / ✅	✅ / ✅	5 / 3	3481 / 3475	✅ / ✅	✅ / ✅
reactors	21	✅ / ✅	✅ / ✅	1 / ✅	1791 / 1687	✅ / ✅	✅ / ✅
reactors	25	✅ / ✅	✅ / ✅	2 / 1	1829 / 1904	✅ / ✅	✅ / ✅

zhengyu123 and others added 16 commits July 20, 2026 19:39

v0

a18740f

Fix startup

4db801f

Fix startup and add test

e11fe69

Fix j9

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Fix memory ordering

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Merge branch 'main' into zgu/unprotected_vmflag

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zhengyu123 added 2 commits July 22, 2026 15:11

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Merge branch 'zgu/unprotected_stackwalk_recordSample' of github.com:D…

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…ataDog/java-profiler into zgu/unprotected_stackwalk_recordSample

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Comment thread ddprof-lib/src/test/cpp/hotspot_crash_protection_ut.cpp

Comment on lines 336 to 338

TEST(CheckFaultGuardTest, NullThreadIsNoop) {

HotspotSupport::checkFault(nullptr); // must not crash

Profiler::checkFault(nullptr); // must not crash

}

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Benchmark Results (commit 3039d1a)

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Benchmark Results (commit a66e913)

⚠️ Significant outliers

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