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 SIGSEGV handling ---------------- The test case is $ ./test-sigsegv-catch-segv2 Expected output (like on glibc and Cygwin 3.4.6, 3.5.6): Doing SIGSEGV pass 1. Fault 1 caught. Doing SIGSEGV pass 2. Fault 2 caught. Test passed. Actual output in Cygwin 3.6.0: Doing SIGSEGV pass 1. Fault 1 caught. Doing SIGSEGV pass 2. Fault 2 caught. Aborted Stack overflow handling ----------------------- The test cases are $ ./test-c-stack; echo $? and $ ./test-sigsegv-catch-stackoverflow1; echo $? Expected output (like on GNU/Linux): $ ./test-c-stack; echo $? test-c-stack: stack overflow 1 $ ./test-sigsegv-catch-stackoverflow1; echo $? Starting recursion pass 1. Stack overflow 1 caught. Starting recursion pass 2. Stack overflow 2 caught. Test passed. 0 Actual output on Cygwin 3.4.6: $ ./test-c-stack; echo $? test-c-stack: stack overflow 1 $ ./test-sigsegv-catch-stackoverflow1; echo $? Starting recursion pass 1. Stack overflow 1 caught. Starting recursion pass 2. 0 Actual output on Cygwin 3.5.6: $ ./test-c-stack; echo $? Sometimes 0 Sometimes test-c-stack: stack overflow 1 $ ./test-sigsegv-catch-stackoverflow1; echo $? Sometimes Starting recursion pass 1. 0 Sometimes Starting recursion pass 1. Stack overflow 1 caught. Starting recursion pass 2. 0 Actual output on Cygwin 3.6.0: $ ./test-c-stack; echo $? 0 $ ./test-sigsegv-catch-stackoverflow1; echo $? Starting recursion pass 1. 0 Please CC me in your replies. Bruno [1] https://sourceware.org/pipermail/cygwin/2024-December/256973.html -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
