From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Victor Stinner Date: Fri, 19 Jun 2020 17:16:05 +0200 Subject: [PATCH] 00343: Fix test_faulthandler on GCC 10 bpo-21131: Fix faulthandler.register(chain=True) stack (GH-15276) https://bugs.python.org/issue21131 https://github.com/python/cpython/commit/ac827edc493d3ac3f5b9b0cc353df1d4b418a9aa --- Modules/faulthandler.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/Modules/faulthandler.c b/Modules/faulthandler.c index 3e0a7b127d..fac662afc3 100644 --- a/Modules/faulthandler.c +++ b/Modules/faulthandler.c @@ -1329,7 +1329,11 @@ int _PyFaulthandler_Init(void) * be able to allocate memory on the stack, even on a stack overflow. If it * fails, ignore the error. */ stack.ss_flags = 0; - stack.ss_size = SIGSTKSZ; + /* bpo-21131: allocate dedicated stack of SIGSTKSZ*2 bytes, instead of just + SIGSTKSZ bytes. Calling the previous signal handler in faulthandler + signal handler uses more than SIGSTKSZ bytes of stack memory on some + platforms. */ + stack.ss_size = SIGSTKSZ * 2; stack.ss_sp = PyMem_Malloc(stack.ss_size); if (stack.ss_sp != NULL) { err = sigaltstack(&stack, &old_stack);