Index: sys/compat/linux/linux_stats.c
===================================================================
--- sys/compat/linux/linux_stats.c
+++ sys/compat/linux/linux_stats.c
@@ -70,6 +70,17 @@
 		sb->st_mode |= S_IFBLK;
 	}
 
+	/*
+	 * Return the same st_dev for every devfs instance.  The reason
+	 * for this is to work around an idiosyncrasy of glibc getttynam()
+	 * implementation: it checks whether st_dev returned for fd 0
+	 * is the same as st_dev returned for the target of /proc/self/fd/0
+	 * symlink, and with linux chroots having their own devfs instance,
+	 * the check will fail if you chroot into it.
+	 */
+	if (vp->v_type == VCHR && rootdevmp != NULL)
+		sb->st_dev = rootdevmp->mnt_stat.f_fsid.val[0];
+
 	if (vp->v_type == VCHR && vp->v_rdev != NULL &&
 	    linux_driver_get_major_minor(devtoname(vp->v_rdev),
 	    &major, &minor) == 0) {
@@ -123,6 +134,8 @@
 		buf->st_mode &= ~S_IFMT;
 		buf->st_mode |= S_IFBLK;
 	}
+	if (vp != NULL && vp->v_type == VCHR && rootdevmp != NULL)
+		buf->st_dev = rootdevmp->mnt_stat.f_fsid.val[0];
 	if (vp != NULL && vp->v_rdev != NULL &&
 	    linux_driver_get_major_minor(devtoname(vp->v_rdev),
 					 &major, &minor) == 0) {