1 files changed, 3 insertions, 0 deletions

diff --git a/src/xgselect.c b/src/xgselect.c
index e418e1a3c4e..2f23764ae41 100644
--- a/src/xgselect.c
+++ b/src/xgselect.c
@@ -76,6 +76,9 @@ xg_select (int fds_lim, fd_set *rfds, fd_set *wfds, fd_set *efds,
 
   if (gfds_size < n_gfds)
     {
+      /* Avoid using SAFE_NALLOCA, as that implicitly refers to the
+         current thread.  Using xnmalloc avoids thread-switching
+         problems here.  */
       gfds = xnmalloc (n_gfds, sizeof *gfds);
       must_free = 1;
       gfds_size = n_gfds;