Support J9 / OpenJ9 ucontext (registers) by bric3 · Pull Request #10959 · DataDog/dd-trace-java

bric3 · 2026-03-25T12:06:30Z

What Does This Do

This PR parses the GPINFO register section (1XHREGISTERS / 2XHREGISTER tags) from J9/OpenJ9 javacore crash dumps mirroring what was done for HotSpot in

Add processor context for hotspot crash tracking #10867

The J9/OpenJ9 register format is :

1XHREGISTERS   Registers:
2XHREGISTER      RIP: 00007F8B7C0B3D7D   (x86-64)
2XHREGISTER      PC:  0000FFFF98B9FB6C   (aarch64)
...

Additional Notes

There was a crashdump but it didn't had any registers, so I generated new ones for IBM J9 (Java 8) and IBM Semeru / OpenJ9 (Java 11) that were obtained using Docker and this crashing program:

import sun.misc.Unsafe;
import java.lang.reflect.Field;
public class Crash {
    public static void main(String[] args) throws Exception {
        Field f = Unsafe.class.getDeclaredField("theUnsafe");
        f.setAccessible(true);
        Unsafe unsafe = (Unsafe) f.get(null);
        unsafe.putInt(0L, 42); // SIGSEGV -> GPF dump
    }
}

docker run --rm -v /tmp/j9-crash-test:/work ibmjava:8-sdk \
  bash -c "cd /work && javac Crash.java && \
           java -Xdump:java:events=gpf,file=/work/javacore.ibmj9.txt Crash"

docker run --rm -v /tmp/j9-crash-test:/work ibm-semeru-runtimes:open-11-jdk \
  bash -c "cd /work && javac Crash.java && \
           java -Xdump:java:events=gpf,file=/work/javacore.openj9.txt Crash"

Note the default J9 javacore dump agent fires on multiple events (gpf, user, vmstop, etc.). By specifying events=gpf we restricted it to only fire on the crash signal.

Also, gpf stands for General Protection Fault — it is the J9/OpenJ9 name for a segmentation fault (SIGSEGV). And it's mentioned mentioned it in the javacore header:

1TISIGINFO     Dump Event "gpf" (00002000) received

Doc: https://eclipse.dev/openj9/docs/xdump/#dump-events

github-actions · 2026-03-25T12:06:40Z

Hi! 👋 Thanks for your pull request! 🎉

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Add at least one type, and one component or instrumentation label to the pull request

If you need help, please check our contributing guidelines.

pr-commenter · 2026-03-25T13:13:01Z

Benchmarks

Startup

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	bdu/processor-context-j9
git_commit_date	1774448623	1774450072
git_commit_sha	`fd08777`	`cb8bcea`
release_version	1.61.0-SNAPSHOT~fd087771cb	1.61.0-SNAPSHOT~cb8bceac58

See matching parameters

	Baseline	Candidate
application	insecure-bank	insecure-bank
ci_job_date	1774451782	1774451782
ci_job_id	1537633768	1537633768
ci_pipeline_id	104349205	104349205
cpu_model	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz
kernel_version	Linux runner-zfyrx7zua-project-304-concurrent-0-49i2vh7h 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux	Linux runner-zfyrx7zua-project-304-concurrent-0-49i2vh7h 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
module	Agent	Agent
parent	None	None

Summary

Found 0 performance improvements and 0 performance regressions! Performance is the same for 62 metrics, 9 unstable metrics.

Startup time reports for petclinic

gantt
    title petclinic - global startup overhead: candidate=1.61.0-SNAPSHOT~cb8bceac58, baseline=1.61.0-SNAPSHOT~fd087771cb

    dateFormat X
    axisFormat %s
section tracing
Agent [baseline] (1.054 s) : 0, 1054103
Total [baseline] (11.054 s) : 0, 11054316
Agent [candidate] (1.057 s) : 0, 1057377
Total [candidate] (11.051 s) : 0, 11050769
section appsec
Agent [baseline] (1.257 s) : 0, 1256846
Total [baseline] (11.196 s) : 0, 11196491
Agent [candidate] (1.248 s) : 0, 1248199
Total [candidate] (11.139 s) : 0, 11138591
section iast
Agent [baseline] (1.228 s) : 0, 1227880
Total [baseline] (11.327 s) : 0, 11327187
Agent [candidate] (1.235 s) : 0, 1235345
Total [candidate] (11.343 s) : 0, 11343271
section profiling
Agent [baseline] (1.182 s) : 0, 1181916
Total [baseline] (10.982 s) : 0, 10981940
Agent [candidate] (1.182 s) : 0, 1182198
Total [candidate] (10.977 s) : 0, 10976723

baseline results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.054 s	-
Agent	appsec	1.257 s	202.743 ms (19.2%)
Agent	iast	1.228 s	173.777 ms (16.5%)
Agent	profiling	1.182 s	127.813 ms (12.1%)
Total	tracing	11.054 s	-
Total	appsec	11.196 s	142.175 ms (1.3%)
Total	iast	11.327 s	272.871 ms (2.5%)
Total	profiling	10.982 s	-72.376 ms (-0.7%)

candidate results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.057 s	-
Agent	appsec	1.248 s	190.822 ms (18.0%)
Agent	iast	1.235 s	177.968 ms (16.8%)
Agent	profiling	1.182 s	124.821 ms (11.8%)
Total	tracing	11.051 s	-
Total	appsec	11.139 s	87.822 ms (0.8%)
Total	iast	11.343 s	292.502 ms (2.6%)
Total	profiling	10.977 s	-74.045 ms (-0.7%)

gantt
    title petclinic - break down per module: candidate=1.61.0-SNAPSHOT~cb8bceac58, baseline=1.61.0-SNAPSHOT~fd087771cb

    dateFormat X
    axisFormat %s
section tracing
crashtracking [baseline] (1.203 ms) : 0, 1203
crashtracking [candidate] (1.196 ms) : 0, 1196
BytebuddyAgent [baseline] (626.606 ms) : 0, 626606
BytebuddyAgent [candidate] (627.854 ms) : 0, 627854
AgentMeter [baseline] (29.369 ms) : 0, 29369
AgentMeter [candidate] (29.437 ms) : 0, 29437
GlobalTracer [baseline] (256.212 ms) : 0, 256212
GlobalTracer [candidate] (256.632 ms) : 0, 256632
AppSec [baseline] (31.717 ms) : 0, 31717
AppSec [candidate] (31.591 ms) : 0, 31591
Debugger [baseline] (60.062 ms) : 0, 60062
Debugger [candidate] (60.156 ms) : 0, 60156
Remote Config [baseline] (582.003 µs) : 0, 582
Remote Config [candidate] (592.447 µs) : 0, 592
Telemetry [baseline] (8.792 ms) : 0, 8792
Telemetry [candidate] (9.586 ms) : 0, 9586
Flare Poller [baseline] (3.518 ms) : 0, 3518
Flare Poller [candidate] (4.263 ms) : 0, 4263
section appsec
crashtracking [baseline] (1.204 ms) : 0, 1204
crashtracking [candidate] (1.193 ms) : 0, 1193
BytebuddyAgent [baseline] (663.551 ms) : 0, 663551
BytebuddyAgent [candidate] (659.219 ms) : 0, 659219
AgentMeter [baseline] (12.207 ms) : 0, 12207
AgentMeter [candidate] (12.157 ms) : 0, 12157
GlobalTracer [baseline] (260.071 ms) : 0, 260071
GlobalTracer [candidate] (257.965 ms) : 0, 257965
IAST [baseline] (24.45 ms) : 0, 24450
IAST [candidate] (24.182 ms) : 0, 24182
AppSec [baseline] (179.056 ms) : 0, 179056
AppSec [candidate] (178.404 ms) : 0, 178404
Debugger [baseline] (67.021 ms) : 0, 67021
Debugger [candidate] (66.105 ms) : 0, 66105
Remote Config [baseline] (623.894 µs) : 0, 624
Remote Config [candidate] (636.146 µs) : 0, 636
Telemetry [baseline] (8.501 ms) : 0, 8501
Telemetry [candidate] (8.463 ms) : 0, 8463
Flare Poller [baseline] (3.632 ms) : 0, 3632
Flare Poller [candidate] (3.62 ms) : 0, 3620
section iast
crashtracking [baseline] (1.2 ms) : 0, 1200
crashtracking [candidate] (1.212 ms) : 0, 1212
BytebuddyAgent [baseline] (796.494 ms) : 0, 796494
BytebuddyAgent [candidate] (801.506 ms) : 0, 801506
AgentMeter [baseline] (11.403 ms) : 0, 11403
AgentMeter [candidate] (11.661 ms) : 0, 11661
GlobalTracer [baseline] (247.501 ms) : 0, 247501
GlobalTracer [candidate] (248.251 ms) : 0, 248251
IAST [baseline] (25.307 ms) : 0, 25307
IAST [candidate] (25.528 ms) : 0, 25528
AppSec [baseline] (26.472 ms) : 0, 26472
AppSec [candidate] (26.719 ms) : 0, 26719
Debugger [baseline] (69.041 ms) : 0, 69041
Debugger [candidate] (70.355 ms) : 0, 70355
Remote Config [baseline] (528.656 µs) : 0, 529
Remote Config [candidate] (528.524 µs) : 0, 529
Telemetry [baseline] (10.204 ms) : 0, 10204
Telemetry [candidate] (9.782 ms) : 0, 9782
Flare Poller [baseline] (3.639 ms) : 0, 3639
Flare Poller [candidate] (3.53 ms) : 0, 3530
section profiling
crashtracking [baseline] (1.167 ms) : 0, 1167
crashtracking [candidate] (1.174 ms) : 0, 1174
BytebuddyAgent [baseline] (682.428 ms) : 0, 682428
BytebuddyAgent [candidate] (683.008 ms) : 0, 683008
AgentMeter [baseline] (9.021 ms) : 0, 9021
AgentMeter [candidate] (9.025 ms) : 0, 9025
GlobalTracer [baseline] (214.833 ms) : 0, 214833
GlobalTracer [candidate] (214.902 ms) : 0, 214902
AppSec [baseline] (32.15 ms) : 0, 32150
AppSec [candidate] (32.147 ms) : 0, 32147
Debugger [baseline] (65.91 ms) : 0, 65910
Debugger [candidate] (65.084 ms) : 0, 65084
Remote Config [baseline] (553.435 µs) : 0, 553
Remote Config [candidate] (559.619 µs) : 0, 560
Telemetry [baseline] (7.68 ms) : 0, 7680
Telemetry [candidate] (7.621 ms) : 0, 7621
Flare Poller [baseline] (3.442 ms) : 0, 3442
Flare Poller [candidate] (4.128 ms) : 0, 4128
ProfilingAgent [baseline] (93.858 ms) : 0, 93858
ProfilingAgent [candidate] (93.661 ms) : 0, 93661
Profiling [baseline] (94.413 ms) : 0, 94413
Profiling [candidate] (94.221 ms) : 0, 94221

Startup time reports for insecure-bank

gantt
    title insecure-bank - global startup overhead: candidate=1.61.0-SNAPSHOT~cb8bceac58, baseline=1.61.0-SNAPSHOT~fd087771cb

    dateFormat X
    axisFormat %s
section tracing
Agent [baseline] (1.058 s) : 0, 1058047
Total [baseline] (8.881 s) : 0, 8880943
Agent [candidate] (1.067 s) : 0, 1067228
Total [candidate] (8.862 s) : 0, 8862274
section iast
Agent [baseline] (1.226 s) : 0, 1226391
Total [baseline] (9.54 s) : 0, 9540459
Agent [candidate] (1.225 s) : 0, 1225338
Total [candidate] (9.566 s) : 0, 9566188

baseline results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.058 s	-
Agent	iast	1.226 s	168.343 ms (15.9%)
Total	tracing	8.881 s	-
Total	iast	9.54 s	659.516 ms (7.4%)

candidate results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.067 s	-
Agent	iast	1.225 s	158.11 ms (14.8%)
Total	tracing	8.862 s	-
Total	iast	9.566 s	703.914 ms (7.9%)

gantt
    title insecure-bank - break down per module: candidate=1.61.0-SNAPSHOT~cb8bceac58, baseline=1.61.0-SNAPSHOT~fd087771cb

    dateFormat X
    axisFormat %s
section tracing
crashtracking [baseline] (1.197 ms) : 0, 1197
crashtracking [candidate] (1.203 ms) : 0, 1203
BytebuddyAgent [baseline] (629.458 ms) : 0, 629458
BytebuddyAgent [candidate] (634.957 ms) : 0, 634957
AgentMeter [baseline] (29.548 ms) : 0, 29548
AgentMeter [candidate] (29.955 ms) : 0, 29955
GlobalTracer [baseline] (256.741 ms) : 0, 256741
GlobalTracer [candidate] (259.56 ms) : 0, 259560
AppSec [baseline] (31.714 ms) : 0, 31714
AppSec [candidate] (32.133 ms) : 0, 32133
Debugger [baseline] (59.593 ms) : 0, 59593
Debugger [candidate] (60.239 ms) : 0, 60239
Remote Config [baseline] (590.758 µs) : 0, 591
Remote Config [candidate] (591.712 µs) : 0, 592
Telemetry [baseline] (8.028 ms) : 0, 8028
Telemetry [candidate] (8.075 ms) : 0, 8075
Flare Poller [baseline] (5.006 ms) : 0, 5006
Flare Poller [candidate] (4.218 ms) : 0, 4218
section iast
crashtracking [baseline] (1.185 ms) : 0, 1185
crashtracking [candidate] (1.184 ms) : 0, 1184
BytebuddyAgent [baseline] (795.397 ms) : 0, 795397
BytebuddyAgent [candidate] (795.201 ms) : 0, 795201
AgentMeter [baseline] (11.354 ms) : 0, 11354
AgentMeter [candidate] (11.393 ms) : 0, 11393
GlobalTracer [baseline] (247.346 ms) : 0, 247346
GlobalTracer [candidate] (246.952 ms) : 0, 246952
IAST [baseline] (25.361 ms) : 0, 25361
IAST [candidate] (25.342 ms) : 0, 25342
AppSec [baseline] (26.54 ms) : 0, 26540
AppSec [candidate] (27.305 ms) : 0, 27305
Debugger [baseline] (66.808 ms) : 0, 66808
Debugger [candidate] (68.225 ms) : 0, 68225
Remote Config [baseline] (525.995 µs) : 0, 526
Remote Config [candidate] (526.551 µs) : 0, 527
Telemetry [baseline] (11.72 ms) : 0, 11720
Telemetry [candidate] (9.646 ms) : 0, 9646
Flare Poller [baseline] (4.094 ms) : 0, 4094
Flare Poller [candidate] (3.459 ms) : 0, 3459

Load

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	bdu/processor-context-j9
git_commit_date	1774448623	1774450072
git_commit_sha	`fd08777`	`cb8bcea`
release_version	1.61.0-SNAPSHOT~fd087771cb	1.61.0-SNAPSHOT~cb8bceac58

See matching parameters

	Baseline	Candidate
application	insecure-bank	insecure-bank
ci_job_date	1774452349	1774452349
ci_job_id	1537633771	1537633771
ci_pipeline_id	104349205	104349205
cpu_model	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz
kernel_version	Linux runner-zfyrx7zua-project-304-concurrent-0-49b7x47g 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux	Linux runner-zfyrx7zua-project-304-concurrent-0-49b7x47g 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

Summary

Found 0 performance improvements and 1 performance regressions! Performance is the same for 18 metrics, 17 unstable metrics.

scenario	Δ mean agg_http_req_duration_p50	Δ mean agg_http_req_duration_p95	Δ mean throughput	candidate mean agg_http_req_duration_p50	candidate mean agg_http_req_duration_p95	candidate mean throughput	baseline mean agg_http_req_duration_p50	baseline mean agg_http_req_duration_p95	baseline mean throughput
scenario:load:insecure-bank:iast_FULL:high_load	unsure [+10.310µs; +384.508µs] or [+0.201%; +7.493%]	worse [+301.358µs; +1288.848µs] or [+2.459%; +10.518%]	unstable [-117.121op/s; +52.809op/s] or [-14.632%; +6.597%]	5.329ms	13.049ms	768.281op/s	5.132ms	12.253ms	800.438op/s

Request duration reports for insecure-bank

gantt
    title insecure-bank - request duration [CI 0.99] : candidate=1.61.0-SNAPSHOT~cb8bceac58, baseline=1.61.0-SNAPSHOT~fd087771cb
    dateFormat X
    axisFormat %s
section baseline
no_agent (1.205 ms) : 1193, 1217
.   : milestone, 1205,
iast (3.13 ms) : 3090, 3171
.   : milestone, 3130,
iast_FULL (5.776 ms) : 5719, 5834
.   : milestone, 5776,
iast_GLOBAL (3.573 ms) : 3518, 3629
.   : milestone, 3573,
profiling (2.071 ms) : 2051, 2092
.   : milestone, 2071,
tracing (1.783 ms) : 1769, 1797
.   : milestone, 1783,
section candidate
no_agent (1.219 ms) : 1206, 1232
.   : milestone, 1219,
iast (3.157 ms) : 3113, 3202
.   : milestone, 3157,
iast_FULL (6.02 ms) : 5957, 6082
.   : milestone, 6020,
iast_GLOBAL (3.651 ms) : 3587, 3715
.   : milestone, 3651,
profiling (2.128 ms) : 2109, 2146
.   : milestone, 2128,
tracing (1.772 ms) : 1757, 1786
.   : milestone, 1772,

baseline results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	1.205 ms [1.193 ms, 1.217 ms]	-
iast	3.13 ms [3.09 ms, 3.171 ms]	1.925 ms (159.7%)
iast_FULL	5.776 ms [5.719 ms, 5.834 ms]	4.571 ms (379.3%)
iast_GLOBAL	3.573 ms [3.518 ms, 3.629 ms]	2.368 ms (196.5%)
profiling	2.071 ms [2.051 ms, 2.092 ms]	866.044 µs (71.9%)
tracing	1.783 ms [1.769 ms, 1.797 ms]	577.482 µs (47.9%)

candidate results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	1.219 ms [1.206 ms, 1.232 ms]	-
iast	3.157 ms [3.113 ms, 3.202 ms]	1.938 ms (159.0%)
iast_FULL	6.02 ms [5.957 ms, 6.082 ms]	4.801 ms (393.8%)
iast_GLOBAL	3.651 ms [3.587 ms, 3.715 ms]	2.432 ms (199.5%)
profiling	2.128 ms [2.109 ms, 2.146 ms]	908.648 µs (74.5%)
tracing	1.772 ms [1.757 ms, 1.786 ms]	552.652 µs (45.3%)

Request duration reports for petclinic

gantt
    title petclinic - request duration [CI 0.99] : candidate=1.61.0-SNAPSHOT~cb8bceac58, baseline=1.61.0-SNAPSHOT~fd087771cb
    dateFormat X
    axisFormat %s
section baseline
no_agent (19.107 ms) : 18907, 19308
.   : milestone, 19107,
appsec (18.524 ms) : 18336, 18712
.   : milestone, 18524,
code_origins (17.754 ms) : 17576, 17932
.   : milestone, 17754,
iast (17.591 ms) : 17418, 17764
.   : milestone, 17591,
profiling (19.282 ms) : 19089, 19474
.   : milestone, 19282,
tracing (17.831 ms) : 17659, 18003
.   : milestone, 17831,
section candidate
no_agent (18.921 ms) : 18728, 19114
.   : milestone, 18921,
appsec (18.348 ms) : 18163, 18532
.   : milestone, 18348,
code_origins (17.659 ms) : 17485, 17834
.   : milestone, 17659,
iast (17.816 ms) : 17640, 17993
.   : milestone, 17816,
profiling (19.606 ms) : 19405, 19807
.   : milestone, 19606,
tracing (17.763 ms) : 17588, 17939
.   : milestone, 17763,

baseline results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	19.107 ms [18.907 ms, 19.308 ms]	-
appsec	18.524 ms [18.336 ms, 18.712 ms]	-582.895 µs (-3.1%)
code_origins	17.754 ms [17.576 ms, 17.932 ms]	-1.353 ms (-7.1%)
iast	17.591 ms [17.418 ms, 17.764 ms]	-1.517 ms (-7.9%)
profiling	19.282 ms [19.089 ms, 19.474 ms]	174.696 µs (0.9%)
tracing	17.831 ms [17.659 ms, 18.003 ms]	-1.276 ms (-6.7%)

candidate results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	18.921 ms [18.728 ms, 19.114 ms]	-
appsec	18.348 ms [18.163 ms, 18.532 ms]	-573.618 µs (-3.0%)
code_origins	17.659 ms [17.485 ms, 17.834 ms]	-1.262 ms (-6.7%)
iast	17.816 ms [17.64 ms, 17.993 ms]	-1.105 ms (-5.8%)
profiling	19.606 ms [19.405 ms, 19.807 ms]	684.589 µs (3.6%)
tracing	17.763 ms [17.588 ms, 17.939 ms]	-1.158 ms (-6.1%)

Dacapo

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	bdu/processor-context-j9
git_commit_date	1774448623	1774450072
git_commit_sha	`fd08777`	`cb8bcea`
release_version	1.61.0-SNAPSHOT~fd087771cb	1.61.0-SNAPSHOT~cb8bceac58

See matching parameters

	Baseline	Candidate
application	biojava	biojava
ci_job_date	1774452109	1774452109
ci_job_id	1537633774	1537633774
ci_pipeline_id	104349205	104349205
cpu_model	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz
kernel_version	Linux runner-zfyrx7zua-project-304-concurrent-1-v47qkqr9 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux	Linux runner-zfyrx7zua-project-304-concurrent-1-v47qkqr9 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

Summary

Found 0 performance improvements and 0 performance regressions! Performance is the same for 10 metrics, 2 unstable metrics.

Execution time for biojava

gantt
    title biojava - execution time [CI 0.99] : candidate=1.61.0-SNAPSHOT~cb8bceac58, baseline=1.61.0-SNAPSHOT~fd087771cb
    dateFormat X
    axisFormat %s
section baseline
no_agent (15.422 s) : 15422000, 15422000
.   : milestone, 15422000,
appsec (14.7 s) : 14700000, 14700000
.   : milestone, 14700000,
iast (17.925 s) : 17925000, 17925000
.   : milestone, 17925000,
iast_GLOBAL (18.037 s) : 18037000, 18037000
.   : milestone, 18037000,
profiling (14.995 s) : 14995000, 14995000
.   : milestone, 14995000,
tracing (15.227 s) : 15227000, 15227000
.   : milestone, 15227000,
section candidate
no_agent (15.453 s) : 15453000, 15453000
.   : milestone, 15453000,
appsec (14.873 s) : 14873000, 14873000
.   : milestone, 14873000,
iast (18.43 s) : 18430000, 18430000
.   : milestone, 18430000,
iast_GLOBAL (17.984 s) : 17984000, 17984000
.   : milestone, 17984000,
profiling (15.178 s) : 15178000, 15178000
.   : milestone, 15178000,
tracing (14.777 s) : 14777000, 14777000
.   : milestone, 14777000,

baseline results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	15.422 s [15.422 s, 15.422 s]	-
appsec	14.7 s [14.7 s, 14.7 s]	-722.0 ms (-4.7%)
iast	17.925 s [17.925 s, 17.925 s]	2.503 s (16.2%)
iast_GLOBAL	18.037 s [18.037 s, 18.037 s]	2.615 s (17.0%)
profiling	14.995 s [14.995 s, 14.995 s]	-427.0 ms (-2.8%)
tracing	15.227 s [15.227 s, 15.227 s]	-195.0 ms (-1.3%)

candidate results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	15.453 s [15.453 s, 15.453 s]	-
appsec	14.873 s [14.873 s, 14.873 s]	-580.0 ms (-3.8%)
iast	18.43 s [18.43 s, 18.43 s]	2.977 s (19.3%)
iast_GLOBAL	17.984 s [17.984 s, 17.984 s]	2.531 s (16.4%)
profiling	15.178 s [15.178 s, 15.178 s]	-275.0 ms (-1.8%)
tracing	14.777 s [14.777 s, 14.777 s]	-676.0 ms (-4.4%)

Execution time for tomcat

gantt
    title tomcat - execution time [CI 0.99] : candidate=1.61.0-SNAPSHOT~cb8bceac58, baseline=1.61.0-SNAPSHOT~fd087771cb
    dateFormat X
    axisFormat %s
section baseline
no_agent (1.478 ms) : 1466, 1490
.   : milestone, 1478,
appsec (3.752 ms) : 3535, 3968
.   : milestone, 3752,
iast (2.28 ms) : 2210, 2350
.   : milestone, 2280,
iast_GLOBAL (2.311 ms) : 2242, 2381
.   : milestone, 2311,
profiling (2.129 ms) : 2072, 2186
.   : milestone, 2129,
tracing (2.085 ms) : 2031, 2139
.   : milestone, 2085,
section candidate
no_agent (1.481 ms) : 1469, 1492
.   : milestone, 1481,
appsec (3.849 ms) : 3627, 4071
.   : milestone, 3849,
iast (2.258 ms) : 2189, 2327
.   : milestone, 2258,
iast_GLOBAL (2.306 ms) : 2237, 2376
.   : milestone, 2306,
profiling (2.488 ms) : 2333, 2643
.   : milestone, 2488,
tracing (2.075 ms) : 2021, 2128
.   : milestone, 2075,

baseline results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	1.478 ms [1.466 ms, 1.49 ms]	-
appsec	3.752 ms [3.535 ms, 3.968 ms]	2.274 ms (153.8%)
iast	2.28 ms [2.21 ms, 2.35 ms]	801.792 µs (54.3%)
iast_GLOBAL	2.311 ms [2.242 ms, 2.381 ms]	833.569 µs (56.4%)
profiling	2.129 ms [2.072 ms, 2.186 ms]	651.498 µs (44.1%)
tracing	2.085 ms [2.031 ms, 2.139 ms]	607.088 µs (41.1%)

candidate results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	1.481 ms [1.469 ms, 1.492 ms]	-
appsec	3.849 ms [3.627 ms, 4.071 ms]	2.368 ms (159.9%)
iast	2.258 ms [2.189 ms, 2.327 ms]	777.125 µs (52.5%)
iast_GLOBAL	2.306 ms [2.237 ms, 2.376 ms]	825.525 µs (55.8%)
profiling	2.488 ms [2.333 ms, 2.643 ms]	1.007 ms (68.0%)
tracing	2.075 ms [2.021 ms, 2.128 ms]	593.996 µs (40.1%)

dd-octo-sts · 2026-03-25T13:22:15Z

/merge

gh-worker-devflow-routing-ef8351 · 2026-03-25T13:22:19Z

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2026-03-25 13:22:19 UTC ℹ️ Start processing command /merge

2026-03-25 13:22:23 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in master is approximately 3h (p90).

2026-03-25 13:22:37 UTC ❌ MergeQueue: This merge request has conflicts

This merge request conflicts with another merge request ahead in the queue.

The merge requests in front of this one are:

#10948 with merge sha 2f912cd

Parse the GPINFO register section (1XHREGISTERS / 2XHREGISTER tags) from J9/OpenJ9 javacore crash dumps mirroring what was done for HotSpot. Register format: 1XHREGISTERS Registers: 2XHREGISTER RIP: 00007F8B7C0B3D7D (x86-64) 2XHREGISTER PC: 0000FFFF98B9FB6C (aarch64) Added crash dumps from IBM J9 (Java 8) and IBM Semeru / OpenJ9 (Java 11) that were obtained using Docker and this crashing program: ```java import sun.misc.Unsafe; import java.lang.reflect.Field; public class Crash { public static void main(String[] args) throws Exception { Field f = Unsafe.class.getDeclaredField("theUnsafe"); f.setAccessible(true); Unsafe unsafe = (Unsafe) f.get(null); unsafe.putInt(0L, 42); // SIGSEGV -> GPF dump } } ``` ``` docker run --rm -v /tmp/j9-crash-test:/work ibmjava:8-sdk \ bash -c "cd /work && javac Crash.java && \ java -Xdump:java:events=gpf,file=/work/javacore.ibmj9.txt Crash" ``` ``` docker run --rm -v /tmp/j9-crash-test:/work ibm-semeru-runtimes:open-11-jdk \ bash -c "cd /work && javac Crash.java && \ java -Xdump:java:events=gpf,file=/work/javacore.openj9.txt Crash" ```

bric3 · 2026-03-25T15:20:02Z

/merge -c

gh-worker-devflow-routing-ef8351 · 2026-03-25T15:20:16Z

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2026-03-25 15:20:07 UTC ℹ️ Start processing command /merge -c
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2026-03-25 15:20:13 UTC ❌ Devflow: /merge -c

This merge request is not in the queue and can't be unqueued

To get help about command usage, write /merge --help

If you need support, contact us on Slack #devflow with those details!

bric3 · 2026-03-25T15:20:50Z

/merge --help

gh-worker-devflow-routing-ef8351 · 2026-03-25T15:20:55Z

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2026-03-25 15:20:54 UTC ℹ️ Start processing command /merge --help

2026-03-25 15:20:55 UTC ℹ️ Help: merge

Add the current pull request in a queue to be processed and merged

-c, --cancel Cancel the previous command
-@, --delay string Date expression for scheduling the merge of this pull request.
Examples: -@ in 3 hours, -@ at midnight, -@ tomorrow at 8am CET
See https://datadoghq.atlassian.net/wiki/spaces/DEVX/pages/3451160252/All+Devflow+actions#Time-expressions for more details.
-d, --deploy Deploy services after merge, try to autodetect services if none specified
-h, --help Display help for this command
-m, --method string Merge method [default|merge|rebase|squash|squash_if_safe] (default "default")
-p, --priority string Priority of the pull request [low|medium|urgent|incident] (default "medium")
--reason string Reason for skipping checks
-s, --service strings Services to deploy (default [])
-f, --skip-checks Skip checks before merging this pull request
-t, --target string Target to use when triggering the post merge deployement, we will try to autodetect the target for the branch if none specified

Examples:

Add the current pull request in a queue to be processed and merged:

merge

Add the current pull request in a queue to be processed and merged with an urgent priority, meaning it will be processed before all other PRs:

merge -p urgent

Add the current pull request in a queue to be processed and merged with an incident priority, meaning it will remove all other PRs from the queue so it can be processed immediately:

merge -p incident

Deploy the impacted services after merge (triggering conductor):

merge -d

Process the current pull request in a queue to be processed and merged at 10am CET:

merge -@ 10am CET

dd-octo-sts · 2026-03-25T15:41:29Z

/merge

gh-worker-devflow-routing-ef8351 · 2026-03-25T15:41:33Z

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2026-03-25 15:41:33 UTC ℹ️ Start processing command /merge

2026-03-25 15:41:39 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in master is approximately 3h (p90).

2026-03-25 17:15:12 UTC ℹ️ MergeQueue: This merge request was merged

bric3 · 2026-03-25T15:42:38Z

/merge --help

gh-worker-devflow-routing-ef8351 · 2026-03-25T15:42:43Z

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2026-03-25 15:42:43 UTC ℹ️ Start processing command /merge --help

2026-03-25 15:42:44 UTC ℹ️ Help: merge

Add the current pull request in a queue to be processed and merged

-c, --cancel Cancel the previous command
-@, --delay string Date expression for scheduling the merge of this pull request.
Examples: -@ in 3 hours, -@ at midnight, -@ tomorrow at 8am CET
See https://datadoghq.atlassian.net/wiki/spaces/DEVX/pages/3451160252/All+Devflow+actions#Time-expressions for more details.
-d, --deploy Deploy services after merge, try to autodetect services if none specified
-h, --help Display help for this command
-m, --method string Merge method [default|merge|rebase|squash|squash_if_safe] (default "default")
-p, --priority string Priority of the pull request [low|medium|urgent|incident] (default "medium")
--reason string Reason for skipping checks
-s, --service strings Services to deploy (default [])
-f, --skip-checks Skip checks before merging this pull request
-t, --target string Target to use when triggering the post merge deployement, we will try to autodetect the target for the branch if none specified

Examples:

Add the current pull request in a queue to be processed and merged:

merge

Add the current pull request in a queue to be processed and merged with an urgent priority, meaning it will be processed before all other PRs:

merge -p urgent

Add the current pull request in a queue to be processed and merged with an incident priority, meaning it will remove all other PRs from the queue so it can be processed immediately:

merge -p incident

Deploy the impacted services after merge (triggering conductor):

merge -d

Process the current pull request in a queue to be processed and merged at 10am CET:

merge -@ 10am CET

bric3 requested a review from a team as a code owner March 25, 2026 12:06

bric3 added type: enhancement Enhancements and improvements comp: crash tracking Crash Tracking labels Mar 25, 2026

bric3 force-pushed the bdu/processor-context-j9 branch from 27a80b6 to eb08fb0 Compare March 25, 2026 12:24

bric3 requested a review from amarziali March 25, 2026 12:31

jbachorik approved these changes Mar 25, 2026

View reviewed changes

bric3 added this pull request to the merge queue Mar 25, 2026

github-merge-queue bot removed this pull request from the merge queue due to failed status checks Mar 25, 2026

bric3 force-pushed the bdu/processor-context-j9 branch from eb08fb0 to cb8bcea Compare March 25, 2026 14:48

bric3 enabled auto-merge March 25, 2026 14:48

bric3 changed the title ~~Support J9 / Open ucontext (registers)~~ Support J9 / OpenJ9 ucontext (registers) Mar 25, 2026

bric3 added this pull request to the merge queue Mar 25, 2026

github-merge-queue bot removed this pull request from the merge queue due to failed status checks Mar 25, 2026

gh-worker-dd-mergequeue-cf854d bot merged commit e4c4150 into master Mar 25, 2026
568 checks passed

gh-worker-dd-mergequeue-cf854d bot deleted the bdu/processor-context-j9 branch March 25, 2026 17:15

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