From: James Y Knight <jyknight@google.com> Date: Tue, 9 Jun 2015 08:07:11 -0400 > Debian glibc has multiarch support disabled (done a couple years ago to try > to workaround the unreliability, not entirely successfully..), so it's not > using that routine you mention. It's using > sysdeps/sparc/sparc32/sparcv9/memcpy.S which points to > sysdeps/sparc/sparc64/memcpy.S I bet you stop getting corruptions if you use the appropriate optimized routine.