On 16/12/2025 14:11, Jon Turney via Cygwin wrote:
On 14/12/2025 07:39, Takashi Yano via Cygwin wrote:
On Sun, 14 Dec 2025 16:26:37 +0900
Takashi Yano via Cygwin <[email protected]> wrote:
Recently, I have concerned that testsuite winsup.api/pthread/cancel2
fails
consistently.
https://github.com/cygwin/cygwin/actions/runs/19926408142/job/57127200619
Thanks very much for looking into this!
I have the vague idea that this problem started showing up (more?)
when the CI VM was upgraded from Windows Server 2022 to Windows Server
2025, but I guess that's maybe just timings...
I'm not sure why this happens, but it also falis in my local
environment.
I looked into this issue a bit, and found that access violation happnes
in CloseHandle() in _cygtls::remove().
And I am also not sure why at all, cancel2 works if CloseHandle()'s are
replaced with NtClose() as follows.
I think this is just the difference between the two calls: CloseHandle
generates an exception whereas NtClose returns an error code if the
handle is invalid.
Historically, CloseHandle() would simply return FALSE (0) for bad
handles. If this changed, it is a regression in Windows itself.
Debug/Checked builds of Windows might report the bad handle to the
debugger, but the Release/Free builds would not throw an exception, BSOD
or other kind of assert().
Doesn't really explain whats wrong with the handle, though.
Enjoy
Jakob
--
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