Hi. I think I found the culprit for StreamsTest failure. It happens in agent mode - jtreg launches agent vm and starts reading child's process input and output[1]. This happens in a separate thread. DoAction[2] reads the captured data and feeds it into the test result[3]. This is a race condition - the thread[1] might not start in time to read the output, or the reader thread might hand off data too late, causing missing or misplaced log lines. I have raised an upstream bug[4] and will try to come up with a patch.
Best Regards, Vladimir. [1] https://github.com/openjdk/jtreg/blob/34ccc66ec89651637811678a17d3f810b4ac0780/src/share/classes/com/sun/javatest/regtest/exec/Agent.java#L189 [2] https://github.com/openjdk/jtreg/blob/34ccc66ec89651637811678a17d3f810b4ac0780/src/share/classes/com/sun/javatest/regtest/exec/Agent.java#L385 [3] https://github.com/openjdk/jtreg/blob/34ccc66ec89651637811678a17d3f810b4ac0780/src/share/classes/com/sun/javatest/regtest/exec/Agent.java#L412C13-L412C34 [4] https://bugs.openjdk.org/browse/CODETOOLS-7904101 On Fri, Oct 10, 2025 at 4:15 PM tony mancill <[email protected]> wrote: > > In 50 more builds of the patched version -3 I observed 6 failures. > All of them were the same failure in StreamsTest: > > jtreg8_8+2+ds1-3_amd64-2025-10-09T01:03:31Z.build:make[2]: *** > [../test/streams/StreamsTest.gmk:38: > /build/reproducible-path/jtreg8-8+2+ds1/build/test/StreamsTest.agentvm.ok] > Error 1 > > On Wed, Oct 08, 2025 at 02:35:57PM +0000, tony mancill wrote: > > I believe that could be a different root cause. I will attempt the AWS > > builds with your patched build. > > > > Thank you for the update. > > > > Cheers, > > tony > > > > On Wed, Oct 08, 2025 at 08:37:17PM +1300, Vladimir Petko wrote: > > > Hi, > > > > > > Unfortunately it did not work - the build eventually failed with: > > > ----- > > > ACTION: main -- Failed. Execution failed: `main' threw exception: > > > java.lang.ClassFormatError: Truncated class file > > > REASON: User specified action: run main/native NativesOK > > > TIME: 0.053 seconds > > > ----- > > > > > > Best Regards, > > > Vladimir. > > > > > > On Wed, Oct 8, 2025 at 7:27 PM Vladimir Petko > > > <[email protected]> wrote: > > > > > > > > Hi, > > > > > > > > I have made a patch to synchronize the filesystem after each jtreg > > > > command[1]. I am building it in a loop in lxc container and so far the > > > > build has not failed. Would it be possible to check if it works in > > > > the AWS environment? > > > > > > > > Best Regards, > > > > Vladimir. > > > > > > > > [1] https://salsa.debian.org/java-team/jtreg8/-/merge_requests/3 > > > > > > > > On Mon, Oct 6, 2025 at 7:35 AM tony mancill <[email protected]> wrote: > > > > > > > > > > On Sun, Oct 05, 2025 at 01:06:01PM +0200, Matthias Klose wrote: > > > > > > Control: severity -1 important > > > > > > > > > > > > lowering the severity, not reproducible in local builds. > > > > > > > > > > I am able to reproduce the build failure in approximately 10% of > > > > > builds > > > > > in a clean sid chroot on a 2-vCPU VM in AWS: > > > > > > > > > > ~/jtreg8$ grep -e ^Status: -e ^Fail-Stage: *_amd64-*.build | grep > > > > > :Status | awk '{print $2}'| sort | uniq -c > > > > > 6 attempted > > > > > 59 successful > > > > > > > > > > You can view the build logs here: > > > > > > > > > > https://people.debian.org/~tmancill/jtreg8-1115694/jtreg_1115694_build_failures.tgz > > > > > > > > > > I haven't had a chance to dig into failure, but it could be in > > > > > StreamsTest.gmk: > > > > > > > > > > jtreg8_8+2+ds1-2_amd64-2025-10-02T15:31:29Z.build:make[2]: *** > > > > > [../test/streams/StreamsTest.gmk:37: > > > > > /build/reproducible-path/jtreg8-8+2+ds1/build/test/StreamsTest.agentvm.ok] > > > > > Error 1 > > > > > jtreg8_8+2+ds1-2_amd64-2025-10-02T17:51:21Z.build:make[2]: *** > > > > > [../test/streams/StreamsTest.gmk:37: > > > > > /build/reproducible-path/jtreg8-8+2+ds1/build/test/StreamsTest.agentvm.ok] > > > > > Error 1 > > > > > jtreg8_8+2+ds1-2_amd64-2025-10-03T00:17:03Z.build:make[2]: *** > > > > > [../test/streams/StreamsTest.gmk:37: > > > > > /build/reproducible-path/jtreg8-8+2+ds1/build/test/StreamsTest.agentvm.ok] > > > > > Error 1 > > > > > jtreg8_8+2+ds1-2_amd64-2025-10-03T00:26:59Z.build:make[2]: *** > > > > > [../test/streams/StreamsTest.gmk:38: > > > > > /build/reproducible-path/jtreg8-8+2+ds1/build/test/StreamsTest.agentvm.ok] > > > > > Error 1 > > > > > jtreg8_8+2+ds1-2_amd64-2025-10-03T15:54:01Z.build:make[2]: *** > > > > > [../test/streams/StreamsTest.gmk:38: > > > > > /build/reproducible-path/jtreg8-8+2+ds1/build/test/StreamsTest.agentvm.ok] > > > > > Error 1 > > > > > jtreg8_8+2+ds1-2_amd64-2025-10-03T16:51:16Z.build:make[2]: *** > > > > > [../test/streams/StreamsTest.gmk:37: > > > > > /build/reproducible-path/jtreg8-8+2+ds1/build/test/StreamsTest.agentvm.ok] > > > > > Error 1 > > > > > > > > > > Thanks, > > > > > tony
