Ensure that du can process a hierarchy

of depth 400 while using no more than 50KB of stack space.

diff --git a/tests/rm/deep-1 b/tests/rm/deep-1
index f653be9ba0363685efe805ed92ff71ede29d13ec..2b7396b02a0340d1cad5f0a7f9b0d4916818d8dc 100755 (executable)
--- a/tests/rm/deep-1
+++ b/tests/rm/deep-1
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 # This is a bit of a torture test for mkdir -p, too.
+# Also make sure du can process this tree without using too much stack space.
 # GNU rm performs *much* better on systems that have a d_type member
 # in the directory structure because then it does only one stat per
 # command line argument.
@@ -38,6 +39,13 @@ echo done
 # Make sure the deep dir was created.
 test -d $deep || fail=1
 
+# Make sure du can handle it without lots using of stack.
+# Before switching to the non-recursive, fts-based version of du,
+# this invocation of du would require a stack of at least 115KB
+# on an x86 linux-2.4.22 system.  The fts-based version needs
+# only 8KB on that same system.
+( ulimit -s 50; du -s $deep > /dev/null ) || fail=1
+
 echo "deleting $tmp..." |tr -d '\n'
 rm -r $tmp || fail=1
 echo done