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Date: Sun, 14 Dec 2025 16:26:37 +0900
To: cygwin AT cygwin DOT com
Subject: Recent testsuite/winsup.api/pthread/cancel2 failure
Message-Id: <20251214162637.1ee05b084788ba073fe94670@nifty.ne.jp>
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From: Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
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Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

Recently, I have concerned that testsuite winsup.api/pthread/cancel2 fails
consistently.

https://github.com/cygwin/cygwin/actions/runs/19926408142/job/57127200619

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.

diff --git a/winsup/cygwin/cygtls.cc b/winsup/cygwin/cygtls.cc
index 13d133f47..249c8cb18 100644
--- a/winsup/cygwin/cygtls.cc
+++ b/winsup/cygwin/cygtls.cc
@@ -118,7 +118,7 @@ _cygtls::remove (DWORD wait)
     {
       HANDLE h = signal_arrived;
       signal_arrived = NULL;
-      CloseHandle (h);
+      NtClose (h);
     }
 
   if (locals.drivemappings)
@@ -148,7 +148,7 @@ _cygtls::remove (DWORD wait)
   if (mutex)
     {
       ReleaseMutex (mutex);
-      CloseHandle (mutex);
+      NtClose (mutex);
     }
 }
 

Any idea?

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

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