On Wed, 15 Oct 2025 01:03:57 GMT, Yasumasa Suenaga <[email protected]> wrote:
>> I tried to get mixed thread dump of the application which runs virtual >> threads (see [Test.java on >> JBS](https://bugs.openjdk.org/secure/attachment/116453/Test.java)) via >> `jhsdb jstack --mixed`, then I got following message: >> >> >> sun.jvm.hotspot.utilities.AssertionFailure: must have non-zero frame size >> at >> jdk.hotspot.agent/sun.jvm.hotspot.utilities.Assert.that(Assert.java:32) >> at >> jdk.hotspot.agent/sun.jvm.hotspot.runtime.x86.X86Frame.senderForCompiledFrame(X86Frame.java:374) >> at >> jdk.hotspot.agent/sun.jvm.hotspot.runtime.x86.X86Frame.sender(X86Frame.java:273) >> at >> jdk.hotspot.agent/sun.jvm.hotspot.runtime.Frame.sender(Frame.java:225) >> at >> jdk.hotspot.agent/sun.jvm.hotspot.runtime.Frame.realSender(Frame.java:230) >> at >> jdk.hotspot.agent/sun.jvm.hotspot.runtime.VFrame.sender(VFrame.java:120) >> at >> jdk.hotspot.agent/sun.jvm.hotspot.runtime.VFrame.javaSender(VFrame.java:150) >> at >> jdk.hotspot.agent/sun.jvm.hotspot.tools.PStack.initJFrameCache(PStack.java:224) >> at jdk.hotspot.agent/sun.jvm.hotspot.tools.PStack.run(PStack.java:73) >> at jdk.hotspot.agent/sun.jvm.hotspot.tools.PStack.run(PStack.java:65) >> at jdk.hotspot.agent/sun.jvm.hotspot.tools.PStack.run(PStack.java:60) >> at jdk.hotspot.agent/sun.jvm.hotspot.tools.JStack.run(JStack.java:67) >> at >> jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:278) >> at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.start(Tool.java:241) >> at >> jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.execute(Tool.java:134) >> at >> jdk.hotspot.agent/sun.jvm.hotspot.tools.JStack.runWithArgs(JStack.java:90) >> at >> jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runJSTACK(SALauncher.java:306) >> at >> jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:507) >> >> >> And also I got following (strange) stacks which causes `AssersionFailure` in >> above: >> >> >> ----------------- 70094 ----------------- >> "ForkJoinPool-1-worker-4" #32 daemon prio=5 tid=0x00007f8f5c371660 nid=70094 >> runnable [0x00007f8f406d9000] >> java.lang.Thread.State: RUNNABLE >> JavaThread state: _thread_in_native >> 0x00007f8f64658462 __syscall_cancel_arch + 0x32 >> 0x00007f8f6464c75c __internal_syscall_cancel + 0x5c >> 0x00007f8f646a8c37 __GI___nanosleep + 0x17 >> 0x00007f8f646bb14e __sleep + 0x3e >> 0x00007f8f4b3a8e1e <nep_invoker_blob> >> 0x00007f8f4b33fe48 * >> java.lang.invoke.LambdaForm$MH+0x000000000c047000.invoke(... > > Yasumasa Suenaga has updated the pull request incrementally with one > additional commit since the last revision: > > Move Thread.yield() test/hotspot/jtreg/serviceability/sa/LingeredAppWithVirtualThread.java line 70: > 68: try { > 69: hndSleep.invoke(sleepArg); > 70: } catch(Throwable t) { Suggestion: } catch (Throwable t) { test/hotspot/jtreg/serviceability/sa/LingeredAppWithVirtualThread.java line 83: > 81: signal.await(); > 82: LingeredApp.main(args); > 83: } catch(Exception e) { Suggestion: } catch (Exception e) { ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/27728#discussion_r2431780907 PR Review Comment: https://git.openjdk.org/jdk/pull/27728#discussion_r2431781235
