[PATCH nft] tests: cover baecd1cf2685 ("segtree: Fix segfault when restoring a huge interval set")

["Štěpán Němec" <snemec@redhat.com>]

Test inspired by [1] with both the set and stack size reduced by the
same power of 2, to preserve the (pre-baecd1cf2685) segfault on one
hand, and make the test successfully complete (post-baecd1cf2685) in a
few seconds even on weaker hardware on the other.

(The reason I stopped at 128kB stack size is that with 64kB I was
getting segfaults even with baecd1cf2685 applied.)

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1908127

Signed-off-by: Štěpán Němec <snemec@redhat.com>
Helped-by: Phil Sutter <phil@nwl.cc>
---
 .../sets/0068interval_stack_overflow_0        | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100755 tests/shell/testcases/sets/0068interval_stack_overflow_0

diff --git a/tests/shell/testcases/sets/0068interval_stack_overflow_0 b/tests/shell/testcases/sets/0068interval_stack_overflow_0
new file mode 100755
index 000000000000..134282de2826
--- /dev/null
+++ b/tests/shell/testcases/sets/0068interval_stack_overflow_0
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+set -e
+
+ruleset_file=$(mktemp)
+
+trap 'rm -f "$ruleset_file"' EXIT
+
+{
+	echo 'define big_set = {'
+	for ((i = 1; i < 255; i++)); do
+		for ((j = 1; j < 80; j++)); do
+			echo "10.0.$i.$j,"
+		done
+	done
+	echo '10.1.0.0/24 }'
+} >"$ruleset_file"
+
+cat >>"$ruleset_file" <<\EOF
+table inet test68_table {
+	set test68_set {
+		type ipv4_addr
+		flags interval
+		elements = { $big_set }
+	}
+}
+EOF
+
+( ulimit -s 128 && "$NFT" -f "$ruleset_file" )

base-commit: 2139913694a9850c9160920b2c638aac4828f9bb
-- 
2.33.1