File _service:tar_scm:backport-avoid-calling-printf-... of Package libunwind

File _service:tar_scm:backport-avoid-calling-printf-because-OE-glibc-2.34-used-mno-.patch of Package libunwind (Revision 516289b99528b7e61f00251b526ca20f)

Currently displaying revision 516289b99528b7e61f00251b526ca20f , Show latest

From ffb69e2384538a7d4b634bdc491d7da9b7220f57 Mon Sep 17 00:00:00 2001
From: chenziyang <chenziyang4@huawei.com>
Date: Tue, 11 Jul 2023 10:19:22 +0800
Subject: [PATCH] avoid calling printf because OE glibc-2.34 used
 -mno-outline-atomics buildflag, it will cause printf to be non-atomic
 operations on ARMv8.1 platform. This will cause printf to stuck into dead
 loop because ptrace sing-step execution cause race condition during printf
 instructions.

---
 tests/mapper.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/tests/mapper.c b/tests/mapper.c
index b47ae78..fcfb080 100644
--- a/tests/mapper.c
+++ b/tests/mapper.c
@@ -43,6 +43,15 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
 # define MAP_NORESERVE 0
 #endif
 
+void __attribute__((noinline)) push_some_stacks(int n)
+{
+  if (n >= 1)
+  {
+    push_some_stacks(n - 1);
+    push_some_stacks(n - 1);
+  }
+}
+
 int
 main (void)
 {
@@ -71,7 +80,7 @@ main (void)
 
   printf ("Turning on single-stepping...\n");
   kill (getpid (), SIGUSR1);	/* tell test-ptrace to start single-stepping */
-  printf ("Va bene?\n");
+  push_some_stacks (4);
   kill (getpid (), SIGUSR2);	/* tell test-ptrace to stop single-stepping */
   printf ("Turned single-stepping off...\n");
   return 0;
-- 
2.33.0