The following two java/nio/channels/vthread/BlockingChannelOps.java
subtests timed out in the JDK26 CI:

java/nio/channels/vthread/BlockingChannelOps.java#poller-modes
java/nio/channels/vthread/BlockingChannelOps.java#no-vmcontinuations

Here's a log file snippet from the 'poller-modes' subtest log file:

#section:junit
----------messages:(9/356)----------
command: junit -Djdk.pollerMode=1 BlockingChannelOps
reason: User specified action: run junit/othervm -Djdk.pollerMode=1 BlockingChannelOps
started: Mon Aug 04 23:35:30 UTC 2025
Mode: othervm [/othervm specified]
Process id: 2197412
Timeout information:
--- Timeout information end.
finished: Mon Aug 04 23:57:05 UTC 2025
elapsed time (seconds): 1294.776
----------configuration:(0/0)----------
----------System.out:(1060/68595)----------
-- VirtualThread[#82]/waiting --
  java.base/java.lang.VirtualThread.park(VirtualThread.java:738)
  java.base/java.lang.System$1.parkVirtualThread(System.java:2284)
  java.base/java.util.concurrent.locks.LockSupport.park(LockSupport.java:367)
  java.base/sun.nio.ch.Poller.poll(Poller.java:197)
  java.base/sun.nio.ch.Poller.poll(Poller.java:144)
  java.base/sun.nio.ch.SelChImpl.park(SelChImpl.java:88)
  java.base/sun.nio.ch.SelChImpl.park(SelChImpl.java:116)
  java.base/sun.nio.ch.SocketChannelImpl.implWrite(SocketChannelImpl.java:565)
  java.base/sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:614)
  BlockingChannelOps.lambda$testSocketChannelWriteAsyncClose$0(BlockingChannelOps.java:203)
  jdk.test.lib.thread.VThreadRunner.lambda$run$0(VThreadRunner.java:66)
  java.base/java.lang.VirtualThread.run(VirtualThread.java:456)

<snip>

-- VirtualThread[#82]/waiting --
  java.base/java.lang.VirtualThread.park(VirtualThread.java:738)
  java.base/java.lang.System$1.parkVirtualThread(System.java:2284)
  java.base/java.util.concurrent.locks.LockSupport.park(LockSupport.java:367)
  java.base/sun.nio.ch.Poller.poll(Poller.java:197)
  java.base/sun.nio.ch.Poller.poll(Poller.java:144)
  java.base/sun.nio.ch.SelChImpl.park(SelChImpl.java:88)
  java.base/sun.nio.ch.SelChImpl.park(SelChImpl.java:116)
  java.base/sun.nio.ch.SocketChannelImpl.implWrite(SocketChannelImpl.java:565)
  java.base/sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.jav

...
Output overflow:
JT Harness has limited the test output to the text
at the beginning and the end, so that you can see how the
test began, and how it completed.

If you need to see more of the output from the test,
set the system property javatest.maxOutputSize to a higher
value. The current value is 100000
...

.base/java.lang.System$1.parkVirtualThread(System.java:2284)
  java.base/java.util.concurrent.locks.LockSupport.park(LockSupport.java:367)
  java.base/sun.nio.ch.Poller.poll(Poller.java:197)
  java.base/sun.nio.ch.Poller.poll(Poller.java:144)
  java.base/sun.nio.ch.SelChImpl.park(SelChImpl.java:88)
  java.base/sun.nio.ch.SelChImpl.park(SelChImpl.java:116)
  java.base/sun.nio.ch.SocketChannelImpl.implWrite(SocketChannelImpl.java:565)
  java.base/sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:614)
  BlockingChannelOps.lambda$testSocketChannelWriteAsyncClose$0(BlockingChannelOps.java:203)
  jdk.test.lib.thread.VThreadRunner.lambda$run$0(VThreadRunner.java:66)
  java.base/java.lang.VirtualThread.run(VirtualThread.java:456)

<snip>

-- VirtualThread[#82]/waiting --
  java.base/java.lang.VirtualThread.park(VirtualThread.java:738)
  java.base/java.lang.System$1.parkVirtualThread(System.java:2284)
  java.base/java.util.concurrent.locks.LockSupport.park(LockSupport.java:367)
  java.base/sun.nio.ch.Poller.poll(Poller.java:197)
  java.base/sun.nio.ch.Poller.poll(Poller.java:144)
  java.base/sun.nio.ch.SelChImpl.park(SelChImpl.java:88)
  java.base/sun.nio.ch.SelChImpl.park(SelChImpl.java:116)
  java.base/sun.nio.ch.SocketChannelImpl.implWrite(SocketChannelImpl.java:565)
  java.base/sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:614)
  BlockingChannelOps.lambda$testSocketChannelWriteAsyncClose$0(BlockingChannelOps.java:203)
  jdk.test.lib.thread.VThreadRunner.lambda$run$0(VThreadRunner.java:66)
  java.base/java.lang.VirtualThread.run(VirtualThread.java:456)
----------System.err:(39/3923)----------
STARTED BlockingChannelOps::testPipeReadInterrupt 'testPipeReadInterrupt()'
SUCCESSFUL BlockingChannelOps::testPipeReadInterrupt 'testPipeReadInterrupt()' [2920ms]
STARTED BlockingChannelOps::testServerSocketChannelAccept1 'testServerSocketChannelAccept1()'
SUCCESSFUL BlockingChannelOps::testServerSocketChannelAccept1 'testServerSocketChannelAccept1()' [634ms]
STARTED BlockingChannelOps::testServerSocketChannelAccept2 'testServerSocketChannelAccept2()'
SUCCESSFUL BlockingChannelOps::testServerSocketChannelAccept2 'testServerSocketChannelAccept2()' [447ms]
STARTED BlockingChannelOps::testServerSocketChannelAcceptAsyncClose 'testServerSocketChannelAcceptAsyncClose()'
SUCCESSFUL BlockingChannelOps::testServerSocketChannelAcceptAsyncClose 'testServerSocketChannelAcceptAsyncClose()' [183ms]
STARTED BlockingChannelOps::testSocketChannelRead 'testSocketChannelRead()'
SUCCESSFUL BlockingChannelOps::testSocketChannelRead 'testSocketChannelRead()' [335ms]
STARTED BlockingChannelOps::testSocketChannelReadInterrupt 'testSocketChannelReadInterrupt()'
SUCCESSFUL BlockingChannelOps::testSocketChannelReadInterrupt 'testSocketChannelReadInterrupt()' [101ms]
STARTED BlockingChannelOps::testSocketChannelAdaptorAccept1 'testSocketChannelAdaptorAccept1()'
SUCCESSFUL BlockingChannelOps::testSocketChannelAdaptorAccept1 'testSocketChannelAdaptorAccept1()' [76ms]
STARTED BlockingChannelOps::testSocketChannelAdaptorAccept2 'testSocketChannelAdaptorAccept2()'
SUCCESSFUL BlockingChannelOps::testSocketChannelAdaptorAccept2 'testSocketChannelAdaptorAccept2()' [219ms]
STARTED BlockingChannelOps::testServerSocketChannelAcceptInterrupt 'testServerSocketChannelAcceptInterrupt()'
SUCCESSFUL BlockingChannelOps::testServerSocketChannelAcceptInterrupt 'testServerSocketChannelAcceptInterrupt()' [79ms]
STARTED BlockingChannelOps::testPipeWriteAsyncClose 'testPipeWriteAsyncClose()'
SUCCESSFUL BlockingChannelOps::testPipeWriteAsyncClose 'testPipeWriteAsyncClose()' [114ms]
STARTED BlockingChannelOps::testPipeReadWrite1 'testPipeReadWrite1()'
SUCCESSFUL BlockingChannelOps::testPipeReadWrite1 'testPipeReadWrite1()' [116ms]
STARTED BlockingChannelOps::testPipeReadWrite2 'testPipeReadWrite2()'
SUCCESSFUL BlockingChannelOps::testPipeReadWrite2 'testPipeReadWrite2()' [59ms]
STARTED BlockingChannelOps::testPipeReadWrite3 'testPipeReadWrite3()'
SUCCESSFUL BlockingChannelOps::testPipeReadWrite3 'testPipeReadWrite3()' [87ms]
STARTED BlockingChannelOps::testSocketChannelWrite 'testSocketChannelWrite()'
SUCCESSFUL BlockingChannelOps::testSocketChannelWrite 'testSocketChannelWrite()' [125ms]
STARTED BlockingChannelOps::testDatagramSocketAdaptorReceiveInterrupt1 'testDatagramSocketAdaptorReceiveInterrupt1()'
SUCCESSFUL BlockingChannelOps::testDatagramSocketAdaptorReceiveInterrupt1 'testDatagramSocketAdaptorReceiveInterrupt1()' [440ms]
STARTED BlockingChannelOps::testDatagramSocketAdaptorReceiveInterrupt2 'testDatagramSocketAdaptorReceiveInterrupt2()'
SUCCESSFUL BlockingChannelOps::testDatagramSocketAdaptorReceiveInterrupt2 'testDatagramSocketAdaptorReceiveInterrupt2()' [134ms]
STARTED BlockingChannelOps::testDatagramSocketAdaptorReceiveAsyncClose1 'testDatagramSocketAdaptorReceiveAsyncClose1()'
SUCCESSFUL BlockingChannelOps::testDatagramSocketAdaptorReceiveAsyncClose1 'testDatagramSocketAdaptorReceiveAsyncClose1()' [241ms]
STARTED BlockingChannelOps::testDatagramSocketAdaptorReceiveAsyncClose2 'testDatagramSocketAdaptorReceiveAsyncClose2()'
SUCCESSFUL BlockingChannelOps::testDatagramSocketAdaptorReceiveAsyncClose2 'testDatagramSocketAdaptorReceiveAsyncClose2()' [50ms]
STARTED BlockingChannelOps::testSocketChannelReadWrite1 'testSocketChannelReadWrite1()'
SUCCESSFUL BlockingChannelOps::testSocketChannelReadWrite1 'testSocketChannelReadWrite1()' [297ms]
STARTED BlockingChannelOps::testSocketChannelWriteAsyncClose 'testSocketChannelWriteAsyncClose()'
----------rerun:(42/7674)*----------

<snip>

result: Error. Program `/opt/mach5/mesos/work_dir/jib-master/install/jdk-25+35-3487/linux-x64-debug.jdk/jdk-25/fastdebug/bin/java' timed out (timeout set to 1200000ms, elapsed time including timeout handling was 1294773ms).


Here's a log file snippet from the 'no-vmcontinuations' subtest:

#section:junit
----------messages:(9/426)----------
command: junit -XX:+UnlockExperimentalVMOptions -XX:-VMContinuations BlockingChannelOps
reason: User specified action: run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:-VMContinuations BlockingChannelOps
started: Mon Aug 04 23:35:22 UTC 2025
Mode: othervm [/othervm specified]
Process id: 2197170
Timeout information:
--- Timeout information end.
finished: Mon Aug 04 23:55:44 UTC 2025
elapsed time (seconds): 1222.115
----------configuration:(0/0)----------
----------System.out:(1118/74969)----------
-- VirtualThread[#78]/waiting --
  java.base/jdk.internal.misc.Unsafe.park(Native Method)
  java.base/java.lang.ThreadBuilders$BoundVirtualThread.park(ThreadBuilders.java:438)
  java.base/java.lang.System$1.parkVirtualThread(System.java:2284)
  java.base/java.util.concurrent.locks.LockSupport.park(LockSupport.java:367)
  java.base/sun.nio.ch.Poller.poll(Poller.java:197)
  java.base/sun.nio.ch.Poller.poll(Poller.java:144)
  java.base/sun.nio.ch.SelChImpl.park(SelChImpl.java:88)
  java.base/sun.nio.ch.SelChImpl.park(SelChImpl.java:116)
  java.base/sun.nio.ch.SocketChannelImpl.implWrite(SocketChannelImpl.java:565)
  java.base/sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:614)
  BlockingChannelOps.lambda$testSocketChannelWriteAsyncClose$0(BlockingChannelOps.java:203)
  jdk.test.lib.thread.VThreadRunner.lambda$run$0(VThreadRunner.java:66)
  java.base/java.lang.ThreadBuilders$BoundVirtualThread.run(ThreadBuilders.java:432)

<snip>

-- VirtualThread[#78]/waiting --
  java.base/jdk.internal.misc.Unsafe.park(Native Method)
  java.base/java.lang.ThreadBuilders$BoundVirtualThread.park(ThreadBuilders.java:438)
  java.base/java.lang.System$1.parkVirtualThread(System.java:2284)
  java.base/java.util.concurrent.locks.LockSupport.park(LockSupport.java:367)
  java.base/sun.nio.ch.Poller.poll(Poller.java:197)
  java.base/sun.nio.ch.Poller.poll(Poller.java:144)
  java.base/sun.nio.ch.SelChImpl.park(SelChImpl.java:88)
  java.base/sun.nio.ch.SelChImpl.park(SelChImpl.java:116)
  java.base/sun.nio.ch.SocketChannelImpl.implWrite(SocketChannelImpl.java:565)
  java.base/sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:614)
  BlockingChannelOps.lambda$testSocketChannelWriteAsyncClose$0(BlockingChannelOps.java:203)
  jdk.test.lib.thread.VThreadRunner.lambda$run$0(VThreadRunner.java:66)
  java.base/java.lang.ThreadBuilders$BoundVirtualThread.run(ThreadBuilders.java:432)
Timeout signalled after 1200 seconds
----------System.err:(69/6594)----------
STARTED BlockingChannelOps::testPipeReadInterrupt 'testPipeReadInterrupt()'
SUCCESSFUL BlockingChannelOps::testPipeReadInterrupt 'testPipeReadInterrupt()' [2414ms]
STARTED BlockingChannelOps::testServerSocketChannelAccept1 'testServerSocketChannelAccept1()'
SUCCESSFUL BlockingChannelOps::testServerSocketChannelAccept1 'testServerSocketChannelAccept1()' [616ms]
STARTED BlockingChannelOps::testServerSocketChannelAccept2 'testServerSocketChannelAccept2()'
SUCCESSFUL BlockingChannelOps::testServerSocketChannelAccept2 'testServerSocketChannelAccept2()' [391ms]
STARTED BlockingChannelOps::testServerSocketChannelAcceptAsyncClose 'testServerSocketChannelAcceptAsyncClose()'
SUCCESSFUL BlockingChannelOps::testServerSocketChannelAcceptAsyncClose 'testServerSocketChannelAcceptAsyncClose()' [181ms]
STARTED BlockingChannelOps::testSocketChannelRead 'testSocketChannelRead()'
SUCCESSFUL BlockingChannelOps::testSocketChannelRead 'testSocketChannelRead()' [317ms]
STARTED BlockingChannelOps::testSocketChannelReadInterrupt 'testSocketChannelReadInterrupt()'
SUCCESSFUL BlockingChannelOps::testSocketChannelReadInterrupt 'testSocketChannelReadInterrupt()' [85ms]
STARTED BlockingChannelOps::testSocketChannelAdaptorAccept1 'testSocketChannelAdaptorAccept1()'
SUCCESSFUL BlockingChannelOps::testSocketChannelAdaptorAccept1 'testSocketChannelAdaptorAccept1()' [76ms]
STARTED BlockingChannelOps::testSocketChannelAdaptorAccept2 'testSocketChannelAdaptorAccept2()'
SUCCESSFUL BlockingChannelOps::testSocketChannelAdaptorAccept2 'testSocketChannelAdaptorAccept2()' [116ms]
STARTED BlockingChannelOps::testServerSocketChannelAcceptInterrupt 'testServerSocketChannelAcceptInterrupt()'
SUCCESSFUL BlockingChannelOps::testServerSocketChannelAcceptInterrupt 'testServerSocketChannelAcceptInterrupt()' [39ms]
STARTED BlockingChannelOps::testPipeWriteAsyncClose 'testPipeWriteAsyncClose()'
SUCCESSFUL BlockingChannelOps::testPipeWriteAsyncClose 'testPipeWriteAsyncClose()' [116ms]
STARTED BlockingChannelOps::testPipeReadWrite1 'testPipeReadWrite1()'
SUCCESSFUL BlockingChannelOps::testPipeReadWrite1 'testPipeReadWrite1()' [126ms]
STARTED BlockingChannelOps::testPipeReadWrite2 'testPipeReadWrite2()'
SUCCESSFUL BlockingChannelOps::testPipeReadWrite2 'testPipeReadWrite2()' [63ms]
STARTED BlockingChannelOps::testPipeReadWrite3 'testPipeReadWrite3()'
SUCCESSFUL BlockingChannelOps::testPipeReadWrite3 'testPipeReadWrite3()' [69ms]
STARTED BlockingChannelOps::testSocketChannelWrite 'testSocketChannelWrite()'
SUCCESSFUL BlockingChannelOps::testSocketChannelWrite 'testSocketChannelWrite()' [117ms]
STARTED BlockingChannelOps::testDatagramSocketAdaptorReceiveInterrupt1 'testDatagramSocketAdaptorReceiveInterrupt1()'
SUCCESSFUL BlockingChannelOps::testDatagramSocketAdaptorReceiveInterrupt1 'testDatagramSocketAdaptorReceiveInterrupt1()' [407ms]
STARTED BlockingChannelOps::testDatagramSocketAdaptorReceiveInterrupt2 'testDatagramSocketAdaptorReceiveInterrupt2()'
SUCCESSFUL BlockingChannelOps::testDatagramSocketAdaptorReceiveInterrupt2 'testDatagramSocketAdaptorReceiveInterrupt2()' [123ms]
STARTED BlockingChannelOps::testDatagramSocketAdaptorReceiveAsyncClose1 'testDatagramSocketAdaptorReceiveAsyncClose1()'
SUCCESSFUL BlockingChannelOps::testDatagramSocketAdaptorReceiveAsyncClose1 'testDatagramSocketAdaptorReceiveAsyncClose1()' [191ms]
STARTED BlockingChannelOps::testDatagramSocketAdaptorReceiveAsyncClose2 'testDatagramSocketAdaptorReceiveAsyncClose2()'
SUCCESSFUL BlockingChannelOps::testDatagramSocketAdaptorReceiveAsyncClose2 'testDatagramSocketAdaptorReceiveAsyncClose2()' [49ms]
STARTED BlockingChannelOps::testSocketChannelReadWrite1 'testSocketChannelReadWrite1()'
SUCCESSFUL BlockingChannelOps::testSocketChannelReadWrite1 'testSocketChannelReadWrite1()' [261ms]
STARTED BlockingChannelOps::testSocketChannelWriteAsyncClose 'testSocketChannelWriteAsyncClose()'
SUCCESSFUL BlockingChannelOps::testSocketChannelWriteAsyncClose 'testSocketChannelWriteAsyncClose()' [1158083ms]
STARTED BlockingChannelOps::testSocketAdaptorRead1 'testSocketAdaptorRead1()'
SUCCESSFUL BlockingChannelOps::testSocketAdaptorRead1 'testSocketAdaptorRead1()' [1855ms]
STARTED BlockingChannelOps::testSocketAdaptorRead2 'testSocketAdaptorRead2()'
SUCCESSFUL BlockingChannelOps::testSocketAdaptorRead2 'testSocketAdaptorRead2()' [68ms]
STARTED BlockingChannelOps::testDatagramChannelReceiveAsyncClose 'testDatagramChannelReceiveAsyncClose()'
SUCCESSFUL BlockingChannelOps::testDatagramChannelReceiveAsyncClose 'testDatagramChannelReceiveAsyncClose()' [334ms]
STARTED BlockingChannelOps::testDatagramChannelReceiveInterrupt 'testDatagramChannelReceiveInterrupt()'
SUCCESSFUL BlockingChannelOps::testDatagramChannelReceiveInterrupt 'testDatagramChannelReceiveInterrupt()' [80ms]
STARTED BlockingChannelOps::testDatagramChannelSendReceive1 'testDatagramChannelSendReceive1()'
SUCCESSFUL BlockingChannelOps::testDatagramChannelSendReceive1 'testDatagramChannelSendReceive1()' [206ms]
STARTED BlockingChannelOps::testDatagramChannelSendReceive2 'testDatagramChannelSendReceive2()'
SUCCESSFUL BlockingChannelOps::testDatagramChannelSendReceive2 'testDatagramChannelSendReceive2()' [82ms]
STARTED BlockingChannelOps::testPipeWriteInterrupt 'testPipeWriteInterrupt()'
SUCCESSFUL BlockingChannelOps::testPipeWriteInterrupt 'testPipeWriteInterrupt()' [160ms]
STARTED BlockingChannelOps::testSocketChannelWriteInterrupt 'testSocketChannelWriteInterrupt()'
SUCCESSFUL BlockingChannelOps::testSocketChannelWriteInterrupt 'testSocketChannelWriteInterrupt()' [70ms]
STARTED BlockingChannelOps::testDatagramSocketAdaptorReceive1 'testDatagramSocketAdaptorReceive1()'
SUCCESSFUL BlockingChannelOps::testDatagramSocketAdaptorReceive1 'testDatagramSocketAdaptorReceive1()' [224ms]
STARTED BlockingChannelOps::testDatagramSocketAdaptorReceive2 'testDatagramSocketAdaptorReceive2()'
SUCCESSFUL BlockingChannelOps::testDatagramSocketAdaptorReceive2 'testDatagramSocketAdaptorReceive2()' [88ms]
STARTED BlockingChannelOps::testPipeReadAsyncClose 'testPipeReadAsyncClose()'
SUCCESSFUL BlockingChannelOps::testPipeReadAsyncClose 'testPipeReadAsyncClose()' [94ms]
STARTED BlockingChannelOps::testSocketChannelReadAsyncClose 'testSocketChannelReadAsyncClose()'
SUCCESSFUL BlockingChannelOps::testSocketChannelReadAsyncClose 'testSocketChannelReadAsyncClose()' [80ms]

[ JUnit Containers: found 4, started 4, succeeded 4, failed 0, aborted 0, skipped 0]
[ JUnit Tests: found 32, started 32, succeeded 32, failed 0, aborted 0, skipped 0]

STATUS:Passed.
----------rerun:(43/7762)*----------

It appears that this subtest PASSED while the timeout handler was running.