[4.1] 3f6de09 Volatile read of the VCL temperature

[Dridi Boukelmoune]

commit 3f6de092898e40346f2f0b1c612e8ed8b9719caa
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Tue Aug 30 21:37:34 2016 +0200

    Volatile read of the VCL temperature
    
    There is currently no locking around temperature changes despite the
    fact that it may be read outside of the CLI thread to make decisions.
    
    In the case of a panic, instead of locking we simply make sure not to
    perform an incomplete read of the pointer.

diff --git a/bin/varnishd/cache/cache_vcl.c b/bin/varnishd/cache/cache_vcl.c
index 3a38bc4..234238b 100644
--- a/bin/varnishd/cache/cache_vcl.c
+++ b/bin/varnishd/cache/cache_vcl.c
@@ -106,7 +106,7 @@ VCL_Panic(struct vsb *vsb, const struct vcl *vcl)
 	VSB_printf(vsb, "busy = %u\n", vcl->busy);
 	VSB_printf(vsb, "discard = %u,\n", vcl->discard);
 	VSB_printf(vsb, "state = %s,\n", vcl->state);
-	VSB_printf(vsb, "temp = %s,\n", vcl->temp);
+	VSB_printf(vsb, "temp = %s,\n", (const volatile char *)vcl->temp);
 	VSB_printf(vsb, "conf = {\n");
 	VSB_indent(vsb, 2);
 	if (vcl->conf == NULL) {