From 39b381252c32275079344d30de18b76fda4bba26 Mon Sep 17 00:00:00 2001
From: Logan Gunthorpe <logang@deltatee.com>
Date: Wed, 27 Jul 2022 15:52:45 -0600
Subject: [PATCH 46/83] tests/00readonly: Run udevadm settle before setting ro

In some recent kernel versions, 00readonly fails with:

  mdadm: failed to set readonly for /dev/md0: Device or resource busy
  ERROR: array is not read-only!

This was traced down to a race condition with udev holding a reference
to the block device at the same time as trying to set it read only.

To fix this, call udevadm settle before setting the array read only.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>
---
 tests/00readonly | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/00readonly b/tests/00readonly
index 39202487..afe243b3 100644
--- a/tests/00readonly
+++ b/tests/00readonly
@@ -12,6 +12,7 @@ do
 			$dev1 $dev2 $dev3 $dev4 --assume-clean
 		check nosync
 		check $level
+		udevadm settle
 		mdadm -ro $md0
 		check readonly
 		state=$(cat /sys/block/md0/md/array_state)
-- 
2.38.1