Patch "mm: memory-failure: fix unexpected return value in soft_offline_page()" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    mm: memory-failure: fix unexpected return value in soft_offline_page()

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:
     mm-memory-failure-fix-unexpected-return-value-in-soft_offline_page.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.


>From e2c1ab070fdc81010ec44634838d24fce9ff9e53 Mon Sep 17 00:00:00 2001
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Date: Tue, 27 Jun 2023 19:28:08 +0800
Subject: mm: memory-failure: fix unexpected return value in soft_offline_page()

From: Miaohe Lin <linmiaohe@xxxxxxxxxx>

commit e2c1ab070fdc81010ec44634838d24fce9ff9e53 upstream.

When page_handle_poison() fails to handle the hugepage or free page in
retry path, soft_offline_page() will return 0 while -EBUSY is expected in
this case.

Consequently the user will think soft_offline_page succeeds while it in
fact failed.  So the user will not try again later in this case.

Link: https://lkml.kernel.org/r/20230627112808.1275241-1-linmiaohe@xxxxxxxxxx
Fixes: b94e02822deb ("mm,hwpoison: try to narrow window race for free pages")
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Acked-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 mm/memory-failure.c |   11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2591,10 +2591,13 @@ retry:
 	if (ret > 0) {
 		ret = soft_offline_in_use_page(page);
 	} else if (ret == 0) {
-		if (!page_handle_poison(page, true, false) && try_again) {
-			try_again = false;
-			flags &= ~MF_COUNT_INCREASED;
-			goto retry;
+		if (!page_handle_poison(page, true, false)) {
+			if (try_again) {
+				try_again = false;
+				flags &= ~MF_COUNT_INCREASED;
+				goto retry;
+			}
+			ret = -EBUSY;
 		}
 	}
 


Patches currently in stable-queue which might be from linmiaohe@xxxxxxxxxx are

queue-6.1/mm-memory-failure-fix-unexpected-return-value-in-soft_offline_page.patch



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