Index: sys/compat/linux/linux_stats.c
===================================================================
--- sys/compat/linux/linux_stats.c
+++ sys/compat/linux/linux_stats.c
@@ -165,6 +165,20 @@
 
 	bzero(&tbuf, sizeof(tbuf));
 	tbuf.st_dev = dev_to_ldev(buf->st_dev);
+
+	/*
+	 * 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 ((S_ISCHR(buf->st_mode) || S_ISBLK(buf->st_mode)) &&
+	    rootdevmp != NULL) {
+		tbuf.st_dev = dev_to_ldev(rootdevmp->mnt_stat.f_fsid.val[0]);
+	}
+
 	tbuf.st_ino = buf->st_ino;
 	tbuf.st_mode = buf->st_mode;
 	tbuf.st_nlink = buf->st_nlink;