From: Willy Tarreau <w@1wt.eu>
Date: Wed, 4 Mar 2020 05:01:40 +0000 (+0100)
Subject: MINOR: debug: call backtrace() once upon startup
X-Git-Tag: v2.1.5~50
X-Git-Url: http://git.haproxy.org/?a=commitdiff_plain;h=5ea6f15e8469d83998a39f28070de47cb8a99c3a;p=haproxy-2.1.git

MINOR: debug: call backtrace() once upon startup

Calling backtrace() will access libgcc at runtime. We don't want to do
it after the chroot, so let's perform a first call to have it ready in
memory for later use.

(cherry picked from commit 0214b45a61cd7cfd59d729b23f497a687192cde6)
Signed-off-by: Willy Tarreau <w@1wt.eu>
---

diff --git a/src/debug.c b/src/debug.c
index 4435fe3..bd9d6f3 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -719,6 +719,14 @@ static int init_debug()
 {
 	struct sigaction sa;
 
+#ifdef USE_BACKTRACE
+	/* calling backtrace() will access libgcc at runtime. We don't want to
+	 * do it after the chroot, so let's perform a first call to have it
+	 * ready in memory for later use.
+	 */
+	void *callers[1];
+	backtrace(callers, sizeof(callers)/sizeof(*callers));
+#endif
 	sa.sa_handler = NULL;
 	sa.sa_sigaction = debug_handler;
 	sigemptyset(&sa.sa_mask);