Work around x86 glibc backtrace bug

* sysdep.c (emacs_backtrace): Don't dump core on x86.
Fixes: bug#19959

2 files changed, 14 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index ae827cb4416..6b658f51671 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,9 @@
+2015-03-05  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Work around x86 glibc backtrace bug
+        * sysdep.c (emacs_backtrace): Don't dump core on x86.
+        Fixes: bug#19959
+
 2015-03-05  Eli Zaretskii  <eliz@gnu.org>
 
         * keyboard.c (make_lispy_position): When the click is on the
diff --git a/src/sysdep.c b/src/sysdep.c
index cb361ec2dc5..0a0b0ac01d0 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -2174,6 +2174,14 @@ emacs_backtrace (int backtrace_limit)
   else
     {
       buffer = main_backtrace_buffer;
+
+      /* Work around 'backtrace' bug; see Bug#19959 and glibc bug#18084.  */
+      if (bounded_limit < 0)
+        {
+          backtrace (buffer, 1);
+          return;
+        }
+
       npointers = backtrace (buffer, bounded_limit + 1);
     }