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 46/52] 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)

-- 

2.31.1