nptl: Open libgcc.so with RTLD_NOW during pthread_cancel [BZ #22636]

Disabling lazy binding reduces stack usage during unwinding.

Note that RTLD_NOW only makes a difference if libgcc.so has not
already been loaded, so this is only a partial fix.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index b1da834..1065883 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2018-01-10  Florian Weimer  <fweimer@redhat.com>
+
+	[BZ #22636]
+	* sysdeps/nptl/unwind-forcedunwind.c (pthread_cancel_init): Open
+	libgcc.so with RTLD_NOW, to avoid lazy binding during unwind.
+
 2018-01-10  Samuel Thibault  <samuel.thibault@ens-lyon.org>
 
 	* hurd/hurd/fd.h: Include <fcntl.h>