This is a note to let you know that I've just added the patch titled
null_blk: Fix: memory release when memory_backed=1
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
null_blk-fix-memory-release-when-memory_backed-1.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 099aa7b3006ca24bd193cc6ebb9321021bc53a71
Author: Nitesh Shetty <nj.shetty@xxxxxxxxxxx>
Date: Mon Jun 5 11:53:53 2023 +0530
null_blk: Fix: memory release when memory_backed=1
[ Upstream commit 8cfb98196cceec35416041c6b91212d2b99392e4 ]
Memory/pages are not freed, when unloading nullblk driver.
Steps to reproduce issue
1.free -h
total used free shared buff/cache available
Mem: 7.8Gi 260Mi 7.1Gi 3.0Mi 395Mi 7.3Gi
Swap: 0B 0B 0B
2.modprobe null_blk memory_backed=1
3.dd if=/dev/urandom of=/dev/nullb0 oflag=direct bs=1M count=1000
4.modprobe -r null_blk
5.free -h
total used free shared buff/cache available
Mem: 7.8Gi 1.2Gi 6.1Gi 3.0Mi 398Mi 6.3Gi
Swap: 0B 0B 0B
Signed-off-by: Anuj Gupta <anuj20.g@xxxxxxxxxxx>
Signed-off-by: Nitesh Shetty <nj.shetty@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230605062354.24785-1-nj.shetty@xxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index c45d09a9a9421..e8cb914223cdf 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -2194,6 +2194,7 @@ static void null_destroy_dev(struct nullb *nullb)
struct nullb_device *dev = nullb->dev;
null_del_dev(nullb);
+ null_free_device_storage(dev, false);
null_free_dev(dev);
}
