RFR: 8374469: Mixed jstack does not work on Windows
Yasumasa Suenaga
ysuenaga at openjdk.org
Fri Jan 2 15:39:31 UTC 2026
When we run `jhsdb jstack --mixed` on Windows, we can see top of call frames only as following:
----------------- 4 -----------------
"main" #3 prio=5 tid=0x0000021ee0357e90 nid=22356 waiting on condition [0x0000004ae7eff000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
JavaThread state: _thread_blocked
0x00007ffca3c41c44 ntdll!NtWaitForSingleObject + 0x14
----------------- 5 -----------------
This is long standing bugs since JDK 9 at least (maybe this includes older JDK releases).
We cannot depend on base pointer to unwind call frames, but SA do that.
This PR use [GetStackTrace](https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/dbgeng/nf-dbgeng-idebugcontrol-getstacktrace) to find caller frame, then native call frames would be unwinded.
However it has still problems for JIT'ed frames because it does not have a hint for unwinder like [RtlAddFunctionTable](https://learn.microsoft.com/en-us/windows/win32/api/winnt/nf-winnt-rtladdfunctiontable). But it would affect entire of JIT compilers, so I've limited the change to SA.
This change passed serviceability/sa tests on Windows 11.
-------------
Commit messages:
- 8374469: Mixed jstack does not work on Windows
Changes: https://git.openjdk.org/jdk/pull/29019/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29019&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8374469
Stats: 138 lines in 6 files changed: 109 ins; 2 del; 27 mod
Patch: https://git.openjdk.org/jdk/pull/29019.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/29019/head:pull/29019
PR: https://git.openjdk.org/jdk/pull/29019
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