From: Zorro Lang <zlang@redhat.com>
Date: Fri, 29 Sep 2017 16:49:25 +0000 (+0800)
Subject: src/nsexec: fix stack pointer alignment exception
X-Git-Tag: v2022.05.01~1849
X-Git-Url: http://git.apps.os.sepia.ceph.com/?p=xfstests-dev.git;a=commitdiff_plain;h=1021cf17bced35bae60eb38338c36b33919a6c0a

src/nsexec: fix stack pointer alignment exception

When test g/317 or g/318 on ARM server, we got a kernel exception:

  kernel: nsexec[8203]: SP Alignment exception: pc=00000000004010a0 sp=00000000005200e8

nsexec gives an unaligned child stack address to clone() system
call sometimes. For making sure it's always aligned, use
"__attribute__((aligned))" extension of GCC (Thanks this suggestion
from Eric sandeen).

Signed-off-by: Zorro Lang <zlang@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
---

diff --git a/src/nsexec.c b/src/nsexec.c
index f033b1a4..c2d172fe 100644
--- a/src/nsexec.c
+++ b/src/nsexec.c
@@ -138,7 +138,8 @@ childFunc(void *arg)
 
 #define STACK_SIZE (1024 * 1024)
 
-static char child_stack[STACK_SIZE];    /* Space for child's stack */
+/* Space for child's stack */
+static char child_stack[STACK_SIZE] __attribute__((aligned));
 
 int
 main(int argc, char *argv[])