python3.5/00343-faulthandler-gcc10.patch

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commit 5044c889dfced2f43e2cccb673d889a4882f6b3b
Author: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Wed Dec 4 12:29:22 2019 -0800
bpo-38965: Fix faulthandler._stack_overflow() on GCC 10 (GH-17467)
Use the "volatile" keyword to prevent tail call optimization
on any compiler, rather than relying on compiler specific pragma.
(cherry picked from commit 8b787964e0a647caa0558b7c29ae501470d727d9)
Co-authored-by: Victor Stinner <vstinner@python.org>
commit ac827edc493d3ac3f5b9b0cc353df1d4b418a9aa
Author: Victor Stinner <vstinner@redhat.com>
Date: Wed Aug 14 23:35:27 2019 +0200
bpo-21131: Fix faulthandler.register(chain=True) stack (GH-15276)
faulthandler now allocates a 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.
diff --git a/Modules/faulthandler.c b/Modules/faulthandler.c
index 56285b6..a682ffa 100644
--- a/Modules/faulthandler.c
+++ b/Modules/faulthandler.c
@@ -952,18 +952,15 @@ faulthandler_fatal_error_py(PyObject *self, PyObject *args)
}
#if defined(HAVE_SIGALTSTACK) && defined(HAVE_SIGACTION)
-#ifdef __INTEL_COMPILER
- /* Issue #23654: Turn off ICC's tail call optimization for the
- * stack_overflow generator. ICC turns the recursive tail call into
- * a loop. */
-# pragma intel optimization_level 0
-#endif
static
Py_uintptr_t
stack_overflow(Py_uintptr_t min_sp, Py_uintptr_t max_sp, size_t *depth)
{
- /* allocate 4096 bytes on the stack at each call */
- unsigned char buffer[4096];
+ /* Allocate (at least) 4096 bytes on the stack at each call.
+
+ bpo-23654, bpo-38965: use volatile keyword to prevent tail call
+ optimization. */
+ volatile unsigned char buffer[4096];
Py_uintptr_t sp = (Py_uintptr_t)&buffer;
*depth += 1;
if (sp < min_sp || max_sp < sp)
@@ -1146,7 +1143,11 @@ 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);