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Date: Tue, 25 Mar 2025 19:17:45 +0900
To: cygwin AT cygwin DOT com
Subject: Re: SIGSEGV handling and stack overflow handling broken in Cygwin
 3.6.0
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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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On Mon, 24 Mar 2025 22:52:04 +0900
Takashi Yano wrote:
> On Mon, 24 Mar 2025 13:26:27 +0100
> Bruno Haible wrote:
> > Hi,
> > 
> > Gnulib contains a few unit tests for
> >   - SIGSEGV handling,
> >   - stack overflow handling (via signal SIGSEGV or SIGBUS).
> > 
> > In Cygwin 3.4.6, SISGEGV handling was fine, and stack overflow handling
> > worked at least for the first stack overflow.
> > 
> > In Cygwin 3.5.6, SISGEGV handling was fine, but stack overflow handling
> > randomly worked for the first stack overflow or did not work, reminding
> > me of the raise() bug [1].
> > 
> > In Cygwin 3.6.0, SISGEGV handling and stack overflow handling are both
> > broken. Not randomly, but always reproducible.
> > 
> > 
> > How to reproduce
> > ================
> > 
> > 1. Create a testdir for gnulib's c-stack module:
> > $ ./gnulib-tool --create-testdir --dir=../testdir1 --single-configure c-stack
> > 2. Transfer it to a Cygwin machine.
> > 3. Build it: ./configure && make && make check
> 
> Thanks for the report and reprodusible steps.
> In my environment, one of your problems is reproduced.
> 
> FAIL: test-c-stack.sh
> PASS: test-sigsegv-catch-segv2.exe
> 
> $ uname -a
> CYGWIN_NT-10.0-19045 HP-Z230 3.6.0-1.x86_64 2025-03-18 17:01 UTC x86_64 Cygwin
> 
> I'll look into the stack overflow issue for now.

I have just submitted a patch to fix this issue. Hopefully, this
also fixes the test-sigsegv-catch-segv2 issue.

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

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