From aa1c91d98ee0e12d473c4ed6dbb00586e9fbf6b5 Mon Sep 17 00:00:00 2001
From: Peter van Dijk <peter.van.dijk@powerdns.com>
Date: Sat, 8 Sep 2018 18:49:42 +0200
Subject: [PATCH] align mthread stacks on 16-byte boundaries

---
 pdns/mtasker.hh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pdns/mtasker.hh b/pdns/mtasker.hh
index 313d18f290..87bc6723cf 100644
--- a/pdns/mtasker.hh
+++ b/pdns/mtasker.hh
@@ -113,6 +113,9 @@ public:
   MTasker(size_t stacksize=16*8192) : d_tid(0), d_maxtid(0), d_stacksize(stacksize), d_waitstatus(Error)
   {
     initMainStackBounds();
+
+    // make sure our stack is 16-byte aligned to make all the architectures happy
+    d_stacksize = d_stacksize >> 4 << 4;
   }
 
   typedef void tfunc_t(void *); //!< type of the pointer that starts a thread 
-- 
2.47.2