RFR: 8374469: Mixed jstack does not work on Windows [v2]
Yasumasa Suenaga
ysuenaga at openjdk.org
Sun Jan 4 05:29:58 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.
Yasumasa Suenaga has updated the pull request incrementally with two additional commits since the last revision:
- Fix split pattern for Windows
- Tweak toFrame()
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/29019/files
- new: https://git.openjdk.org/jdk/pull/29019/files/32053860..d34dfa1c
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=29019&range=01
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=29019&range=00-01
Stats: 8 lines in 2 files changed: 2 ins; 2 del; 4 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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