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To: cygwin AT cygwin DOT com
Subject: Signals may be lost during setjmp or longjmp
Message-ID: <d36f374f-8352-2f0f-c8ae-be20ad7c49a7@t-online.de>
Date: Fri, 22 Nov 2024 15:22:36 +0100
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From: Christian Franke via Cygwin <cygwin AT cygwin DOT com>
Reply-To: cygwin AT cygwin DOT com
Cc: Christian Franke <Christian DOT Franke AT t-online DOT de>
Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

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The command 'stress-ng --longjmp ... -t 1' occasionally fails to 
terminate because some child process does not receive the SIGALRM 
indicating timeout.

Testcase (attached):

$ g++ -O2 -o longjmpsigs longjmpsigs.cc

$ ./longjmpsigs
[^C]
INT   1
[^C]
INT   2
...
[^C]
INT   21
[^C]
[^C]
INT   22
...

The following run in a second window may not stop the process due to few 
lost signals:

for i in {1..100}; do
   echo $i; killall -INT longjmpsigs || break; sleep 1
done

The problem does not occur if a regular loop is used instead of 
setjmp/longjmp.

Reproducible also with current cygwin1.dll 26144e40.

-- 
Regards,
Christian


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