Integrated: 8376264: Mixed jstack could not unwind optimized frame

[Yasumasa Suenaga]

On Sat, 24 Jan 2026 15:13:48 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

> [JDK-8374482](https://bugs.openjdk.org/browse/JDK-8374482) has introduced to treat signal trampoline. It realized to unwind problematic frame from signal trampoline.
> However it would fail if problematic frame is optimized by compiler - it means FDE (Frame Description Entry) of the function is NOP only.
> 
> 
> 00000018 0000000000000010 0000001c FDE cie=00000000 pc=0000000000000200..0000000000000206
>   DW_CFA_nop
>   DW_CFA_nop
>   DW_CFA_nop
> 
> 
> Actually we can see following stacks and exception as following in TestJhsdbJstackMixedCore.java:
> 
> 
> 0x00007f14d500204d      os::abort(bool, void const*, void const*) [clone .co
> ld] + 0x4
> 0x00007f14d6bd0001      VMError::report_and_die(int, char const*, char const
> *, __va_list_tag*, Thread*, unsigned char*, void const*, void const*, char c
> onst*, int, unsigned long) + 0x6f1
> 0x00007f14d6bd07b9      VMError::report_and_die(Thread*, unsigned int, unsig
> ned char*, void const*, void const*, char const*, ...) + 0x88
> 0x00007f14d6bd0818      VMError::report_and_die(Thread*, unsigned int, unsig
> ned char*, void const*, void const*) + 0x58
> 0x00007f14d68ff1ba      JVM_handle_linux_signal + 0x42a
> 0x00007f14d7964290      <signal handler called>
> 0x00007f14d780b3a0      Java_jdk_test_lib_apps_LingeredApp_crash
> 0x00007f14be7468ba
> ----------System.err:(20/1429)----------
> java.lang.NullPointerException: Cannot invoke "sun.jvm.hotspot.debugger.Address.addOffsetTo(long)" because the return value of "sun.jvm.hotspot.runtime.Frame.getFP()" is null
>         at jdk.hotspot.agent/sun.jvm.hotspot.runtime.Frame.addressOfStackSlot(Frame.java:255)
>         at jdk.hotspot.agent/sun.jvm.hotspot.runtime.amd64.AMD64Frame.addressOfInterpreterFrameMethod(AMD64Frame.java:532)
>         at jdk.hotspot.agent/sun.jvm.hotspot.runtime.Frame.getInterpreterFrameMethod(Frame.java:389)
>         at jdk.hotspot.agent/sun.jvm.hotspot.runtime.InterpretedVFrame.getMethod(InterpretedVFrame.java:36)
>         at jdk.hotspot.agent/sun.jvm.hotspot.tools.PStack.getJavaNames(PStack.java:251)
>         at jdk.hotspot.agent/sun.jvm.hotspot.tools.PStack.run(PStack.java:135)
>         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.j...

This pull request has now been integrated.

Changeset: d1b226de
Author:    Yasumasa Suenaga <ysuenaga at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/d1b226dec293804cd6f929c4a46ae59cb246253e
Stats:     206 lines in 7 files changed: 57 ins; 84 del; 65 mod

8376264: Mixed jstack could not unwind optimized frame

Reviewed-by: cjplummer, kevinw

-------------

PR: https://git.openjdk.org/jdk/pull/29398