==412== 1 errors in context 1 of 10:
==412== Thread 2:
==412== Syscall param rt_sigtimedwait(set) points to uninitialised byte(s)
==412==    at 0x389DE0EBF7: do_sigwait (in /lib64/libpthread-2.14.so)
==412==    by 0x389DE0EC78: sigwait (in /lib64/libpthread-2.14.so)
==412==    by 0x40619F: glusterfs_sigwaiter (glusterfsd.c:1241)
==412==    by 0x389DE07AF0: start_thread (in /lib64/libpthread-2.14.so)
==412==    by 0x389DADFB7C: clone (in /lib64/libc-2.14.so)
==412==  Address 0x6422e10 is on thread 2's stack
==412==
==412==
==412== 1 errors in context 2 of 10:
==412== Conditional jump or move depends on uninitialised value(s)
==412==    at 0x389DE0EBCD: do_sigwait (in /lib64/libpthread-2.14.so)
==412==    by 0x389DE0EC78: sigwait (in /lib64/libpthread-2.14.so)
==412==    by 0x40619F: glusterfs_sigwaiter (glusterfsd.c:1241)
==412==    by 0x389DE07AF0: start_thread (in /lib64/libpthread-2.14.so)
==412==    by 0x389DADFB7C: clone (in /lib64/libc-2.14.so)

Found in 3.2.1, still exists in 3.2.2 and head of the master branch.

Trivial to fix, maybe just truth-and-beauty; it'd be nice to eliminate the noise from valgrind output.

diff --git a/glusterfsd/src/glusterfsd.c b/glusterfsd/src/glusterfsd.c
index 35cb286..fb7df3f 100644
--- a/glusterfsd/src/glusterfsd.c
+++ b/glusterfsd/src/glusterfsd.c
@@ -1278,7 +1278,7 @@ glusterfs_sigwaiter (void *arg)
         int       ret = 0;
         int       sig = 0;
 
-
+        sigemptyset (&set);
         sigaddset (&set, SIGINT);   /* cleanup_and_exit */
         sigaddset (&set, SIGTERM);  /* cleanup_and_exit */
         sigaddset (&set, SIGHUP);   /* reincarnate */