gistfile1.txt

From 4f1abfb33cc4685c52b24a7ac15896ea04703655 Mon Sep 17 00:00:00 2001
From: Josh Durgin <josh.durgin@inktank.com>
Date: Thu, 13 Sep 2012 13:01:11 -0700
Subject: [PATCH] librbd: catch sigpfe and print debug info

---
 src/librbd.cc |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/src/librbd.cc b/src/librbd.cc
index e7e0932..11f01c3 100644
--- a/src/librbd.cc
+++ b/src/librbd.cc
@@ -31,6 +31,7 @@
 #include <map>
 #include <string>
 #include <vector>
+#include <signal.h>
 
 #define dout_subsys ceph_subsys_rbd
 #undef dout_prefix
@@ -543,7 +544,19 @@ namespace librbd {
       start_time = ceph_clock_now(ictx->cct);
     }
 
+    static void debug_sigfpe(int signo, siginfo_t *info, void *opaque)
+    {
+      printf("got SIGFPE! si_code = %d address = %p\n", info->si_code,
+	     info->si_addr);
+      assert(0);
+    }
+
     void complete() {
+      struct sigaction action;
+      action.sa_flags = SA_SIGINFO;
+      action.sa_sigaction = debug_sigfpe;
+      sigaction(SIGFPE, &action, NULL);
+
       utime_t elapsed;
       assert(lock.is_locked());
       ldout(ictx->cct, 20) << "start_time sec = " << start_time.tv.tv_sec
-- 
1.7.2.5