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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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Victor Stinner |
761bbd3 |
From: Victor Stinner <vstinner@python.org>
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Victor Stinner |
761bbd3 |
Date: Fri, 19 Jun 2020 17:16:05 +0200
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Victor Stinner |
761bbd3 |
Subject: [PATCH] 00343: Fix test_faulthandler on GCC 10
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Victor Stinner |
761bbd3 |
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Victor Stinner |
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bpo-38965: Fix faulthandler._stack_overflow() on GCC 10
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Victor Stinner |
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Fixed upstream and backported from the 3.7 branch:
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Victor Stinner |
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https://bugs.python.org/issue38965
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Victor Stinner |
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https://github.com/python/cpython/commit/f4a21d3b239bf4f4e4e2a8a5936b9b040645b246
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Victor Stinner |
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Victor Stinner |
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bpo-21131: Fix faulthandler.register(chain=True) stack (GH-15276)
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Victor Stinner |
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https://bugs.python.org/issue21131
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Victor Stinner |
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https://github.com/python/cpython/commit/ac827edc493d3ac3f5b9b0cc353df1d4b418a9aa
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Victor Stinner |
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---
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Victor Stinner |
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Modules/faulthandler.c | 22 +++++++++++-----------
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Victor Stinner |
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1 file changed, 11 insertions(+), 11 deletions(-)
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Victor Stinner |
4cbb173 |
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Victor Stinner |
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diff --git a/Modules/faulthandler.c b/Modules/faulthandler.c
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Victor Stinner |
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index 890c64577c..fac662afc3 100644
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Victor Stinner |
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--- a/Modules/faulthandler.c
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Victor Stinner |
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+++ b/Modules/faulthandler.c
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Victor Stinner |
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@@ -1091,18 +1091,14 @@ faulthandler_fatal_error_py(PyObject *self, PyObject *args)
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Victor Stinner |
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#if defined(HAVE_SIGALTSTACK) && defined(HAVE_SIGACTION)
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Victor Stinner |
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#define FAULTHANDLER_STACK_OVERFLOW
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Victor Stinner |
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Victor Stinner |
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-#ifdef __INTEL_COMPILER
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Victor Stinner |
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- /* Issue #23654: Turn off ICC's tail call optimization for the
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Victor Stinner |
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- * stack_overflow generator. ICC turns the recursive tail call into
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Victor Stinner |
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- * a loop. */
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Victor Stinner |
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-# pragma intel optimization_level 0
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Victor Stinner |
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-#endif
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Victor Stinner |
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-static
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Victor Stinner |
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-uintptr_t
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Victor Stinner |
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+static uintptr_t
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Victor Stinner |
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stack_overflow(uintptr_t min_sp, uintptr_t max_sp, size_t *depth)
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Victor Stinner |
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{
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Victor Stinner |
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- /* allocate 4096 bytes on the stack at each call */
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Victor Stinner |
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- unsigned char buffer[4096];
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Victor Stinner |
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+ /* Allocate (at least) 4096 bytes on the stack at each call.
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Victor Stinner |
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+
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Victor Stinner |
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+ bpo-23654, bpo-38965: use volatile keyword to prevent tail call
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Victor Stinner |
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+ optimization. */
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Victor Stinner |
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+ volatile unsigned char buffer[4096];
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Victor Stinner |
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uintptr_t sp = (uintptr_t)&buffer;
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Victor Stinner |
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*depth += 1;
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Victor Stinner |
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if (sp < min_sp || max_sp < sp)
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Victor Stinner |
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@@ -1333,7 +1329,11 @@ int _PyFaulthandler_Init(void)
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Victor Stinner |
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* be able to allocate memory on the stack, even on a stack overflow. If it
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Victor Stinner |
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* fails, ignore the error. */
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Victor Stinner |
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stack.ss_flags = 0;
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Victor Stinner |
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- stack.ss_size = SIGSTKSZ;
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Victor Stinner |
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+ /* bpo-21131: allocate dedicated stack of SIGSTKSZ*2 bytes, instead of just
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Victor Stinner |
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+ SIGSTKSZ bytes. Calling the previous signal handler in faulthandler
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Victor Stinner |
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+ signal handler uses more than SIGSTKSZ bytes of stack memory on some
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Victor Stinner |
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+ platforms. */
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Victor Stinner |
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+ stack.ss_size = SIGSTKSZ * 2;
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Victor Stinner |
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stack.ss_sp = PyMem_Malloc(stack.ss_size);
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Victor Stinner |
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if (stack.ss_sp != NULL) {
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Victor Stinner |
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err = sigaltstack(&stack, &old_stack);
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