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From 674cce10a34e90f2791a3d58789793eef29e8f8b Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Mon, 26 Oct 2020 17:25:03 +0100
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Subject: [PATCH] tests: shell: Improve concurrent noflush restore test a bit
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The described issue happens only if chain FOO does not exist at program
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start so flush the ruleset after each iteration to make sure this is the
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case. Sadly the bug is still not 100% reproducible on my testing VM.
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While being at it, add a paragraph describing what exact situation the
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test is trying to provoke.
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Fixes: dac904bdcd9a1 ("nft: Fix for concurrent noflush restore calls")
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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(cherry picked from commit ed8c8b9316451a4499eeb592d2cf7d782bbe4e9a)
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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---
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.../ipt-restore/0016-concurrent-restores_0 | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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diff --git a/iptables/tests/shell/testcases/ipt-restore/0016-concurrent-restores_0 b/iptables/tests/shell/testcases/ipt-restore/0016-concurrent-restores_0
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index 53ec12fa368af..aa746ab458a3c 100755
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--- a/iptables/tests/shell/testcases/ipt-restore/0016-concurrent-restores_0
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+++ b/iptables/tests/shell/testcases/ipt-restore/0016-concurrent-restores_0
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@@ -1,5 +1,14 @@
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#!/bin/bash
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+# test for iptables-restore --noflush skipping an explicitly requested chain
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+# flush because the chain did not exist when cache was fetched. In order to
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+# expect for that chain to appear when refreshing the transaction (due to a
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+# concurrent ruleset change), the chain flush job has to be present in batch
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+# job list (although disabled at first).
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+# The input line requesting chain flush is ':FOO - [0:0]'. RS1 and RS2 contents
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+# are crafted to cause EBUSY when deleting the BAR* chains if FOO is not
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+# flushed in the same transaction.
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+
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set -e
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RS="*filter
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@@ -45,7 +54,12 @@ RS2="$RS
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COMMIT
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"
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+NORS="*filter
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+COMMIT
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+"
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+
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for n in $(seq 1 10); do
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+ $XT_MULTI iptables-restore <<< "$NORS"
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$XT_MULTI iptables-restore --noflush -w <<< "$RS1" &
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$XT_MULTI iptables-restore --noflush -w <<< "$RS2" &
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wait -n
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--
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2.28.0
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