This is a note to let you know that I've just added the patch titled
mm: invalidate hwpoison page cache page in fault path
to the 4.14-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-invalidate-hwpoison-page-cache-page-in-fault-path.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Jul 19 01:37:29 PM CEST 2022
From: Rik van Riel <riel@xxxxxxxxxxx>
Date: Tue, 22 Mar 2022 14:44:09 -0700
Subject: mm: invalidate hwpoison page cache page in fault path
From: Rik van Riel <riel@xxxxxxxxxxx>
commit e53ac7374e64dede04d745ff0e70ff5048378d1f upstream.
Sometimes the page offlining code can leave behind a hwpoisoned clean
page cache page. This can lead to programs being killed over and over
and over again as they fault in the hwpoisoned page, get killed, and
then get re-spawned by whatever wanted to run them.
This is particularly embarrassing when the page was offlined due to
having too many corrected memory errors. Now we are killing tasks due
to them trying to access memory that probably isn't even corrupted.
This problem can be avoided by invalidating the page from the page fault
handler, which already has a branch for dealing with these kinds of
pages. With this patch we simply pretend the page fault was successful
if the page was invalidated, return to userspace, incur another page
fault, read in the file from disk (to a new memory page), and then
everything works again.
Link: https://lkml.kernel.org/r/20220212213740.423efcea@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Rik van Riel <riel@xxxxxxxxxxx>
Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Acked-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Reviewed-by: Oscar Salvador <osalvador@xxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
[sudip: use int instead of vm_fault_t]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3342,11 +3342,16 @@ static int __do_fault(struct vm_fault *v
return ret;
if (unlikely(PageHWPoison(vmf->page))) {
- if (ret & VM_FAULT_LOCKED)
+ int poisonret = VM_FAULT_HWPOISON;
+ if (ret & VM_FAULT_LOCKED) {
+ /* Retry if a clean page was removed from the cache. */
+ if (invalidate_inode_page(vmf->page))
+ poisonret = 0;
unlock_page(vmf->page);
+ }
put_page(vmf->page);
vmf->page = NULL;
- return VM_FAULT_HWPOISON;
+ return poisonret;
}
if (unlikely(!(ret & VM_FAULT_LOCKED)))
Patches currently in stable-queue which might be from riel@xxxxxxxxxxx are
queue-4.14/mm-invalidate-hwpoison-page-cache-page-in-fault-path.patch
