This is a note to let you know that I've just added the patch titled
bootmem: remove the vmemmap pages from kmemleak in put_page_bootmem
to the 5.15-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:
bootmem-remove-the-vmemmap-pages-from-kmemleak-in-put_page_bootmem.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From dd0ff4d12dd284c334f7e9b07f8f335af856ac78 Mon Sep 17 00:00:00 2001
From: Liu Shixin <liushixin2@xxxxxxxxxx>
Date: Fri, 19 Aug 2022 17:40:05 +0800
Subject: bootmem: remove the vmemmap pages from kmemleak in put_page_bootmem
From: Liu Shixin <liushixin2@xxxxxxxxxx>
commit dd0ff4d12dd284c334f7e9b07f8f335af856ac78 upstream.
The vmemmap pages is marked by kmemleak when allocated from memblock.
Remove it from kmemleak when freeing the page. Otherwise, when we reuse
the page, kmemleak may report such an error and then stop working.
kmemleak: Cannot insert 0xffff98fb6eab3d40 into the object search tree (overlaps existing)
kmemleak: Kernel memory leak detector disabled
kmemleak: Object 0xffff98fb6be00000 (size 335544320):
kmemleak: comm "swapper", pid 0, jiffies 4294892296
kmemleak: min_count = 0
kmemleak: count = 0
kmemleak: flags = 0x1
kmemleak: checksum = 0
kmemleak: backtrace:
Link: https://lkml.kernel.org/r/20220819094005.2928241-1-liushixin2@xxxxxxxxxx
Fixes: f41f2ed43ca5 (mm: hugetlb: free the vmemmap pages associated with each HugeTLB page)
Signed-off-by: Liu Shixin <liushixin2@xxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/bootmem_info.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/bootmem_info.c
+++ b/mm/bootmem_info.c
@@ -12,6 +12,7 @@
#include <linux/memblock.h>
#include <linux/bootmem_info.h>
#include <linux/memory_hotplug.h>
+#include <linux/kmemleak.h>
void get_page_bootmem(unsigned long info, struct page *page, unsigned long type)
{
@@ -34,6 +35,7 @@ void put_page_bootmem(struct page *page)
ClearPagePrivate(page);
set_page_private(page, 0);
INIT_LIST_HEAD(&page->lru);
+ kmemleak_free_part(page_to_virt(page), PAGE_SIZE);
free_reserved_page(page);
}
}
Patches currently in stable-queue which might be from liushixin2@xxxxxxxxxx are
queue-5.15/bootmem-remove-the-vmemmap-pages-from-kmemleak-in-put_page_bootmem.patch
