[to-be-updated] mm-memory-failurec-fix-race-with-changing-page-compound-again.patch removed from -mm tree

[to-be-updated] mm-memory-failurec-fix-race-with-changing-page-compound-again.patch removed from -mm tree

[Andrew Morton]

The patch titled
     Subject: mm/memory-failure.c: fix race with changing page compound again
has been removed from the -mm tree.  Its filename was
     mm-memory-failurec-fix-race-with-changing-page-compound-again.patch

This patch was dropped because an updated version will be merged

------------------------------------------------------
From: Miaohe Lin <linmiaohe@huawei.com>
Subject: mm/memory-failure.c: fix race with changing page compound again

Patch series "A few fixup patches for memory failure".

This series contains a few patches to fix the race with changing page
compound page, fix potential VM_BUG_ON_PAGE and so on.  More details can
be found in the respective changelogs.


This patch (of 4):

There is a race window where we got the compound_head, the hugetlb page
could be freed to buddy, or even changed to another compound page just
before we try to get hwpoison page.  If this happens, just bail out.

Link: https://lkml.kernel.org/r/20220228140245.24552-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20220228140245.24552-2-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory-failure.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

--- a/mm/memory-failure.c~mm-memory-failurec-fix-race-with-changing-page-compound-again
+++ a/mm/memory-failure.c
@@ -1532,6 +1532,17 @@ static int memory_failure_hugetlb(unsign
 	}
 
 	lock_page(head);
+
+	/**
+	 * The page could have changed compound pages due to race window.
+	 * If this happens just bail out.
+	 */
+	if (!PageHuge(p) || compound_head(p) != head) {
+		action_result(pfn, MF_MSG_DIFFERENT_COMPOUND, MF_IGNORED);
+		res = -EBUSY;
+		goto out;
+	}
+
 	page_flags = head->flags;
 
 	if (hwpoison_filter(p)) {
_

Patches currently in -mm which might be from linmiaohe@huawei.com are

mm-memremap-avoid-calling-kasan_remove_zero_shadow-for-device-private-memory.patch
filemap-remove-find_get_pages.patch
mm-writeback-minor-clean-up-for-highmem_dirtyable_memory.patch
mm-use-helper-function-range_in_vma.patch
mm-use-helper-macro-min-and-max-in-unmap_mapping_range_tree.patch
mm-sparse-make-mminit_validate_memmodel_limits-static.patch
mm-vmalloc-remove-unneeded-function-forward-declaration.patch
mm-mmzoneh-remove-unused-macros.patch
mm-memory-failurec-minor-clean-up-for-memory_failure_dev_pagemap.patch
mm-memory-failurec-catch-unexpected-efault-from-vma_address.patch
mm-memory-failurec-rework-the-signaling-logic-in-kill_proc.patch
mm-memory-failurec-fix-race-with-changing-page-more-robustly.patch
mm-memory-failurec-remove-pageslab-check-in-hwpoison_filter_dev.patch
mm-memory-failurec-rework-the-try_to_unmap-logic-in-hwpoison_user_mappings.patch
mm-memory-failurec-remove-obsolete-comment-in-__soft_offline_page.patch
mm-memory-failurec-remove-unnecessary-pagetranstail-check.patch
mm-hwpoison-inject-support-injecting-hwpoison-to-free-page.patch
mm-memory-failurec-fix-wrong-user-reference-report.patch
mm-memory-failurec-avoid-calling-invalidate_inode_page-with-unexpected-pages.patch
mm-memory-failurec-fix-potential-vm_bug_on_page-in-split_huge_page_to_list.patch
mm-hugetlb-use-helper-macro-__attr_rw.patch
mm-oom_kill-remove-unneeded-is_memcg_oom-check.patch
mm-ksm-use-helper-macro-__attr_rw.patch
mm-balloon_compaction-make-balloon-page-compaction-callbacks-static.patch
mm-memory_hotplug-remove-obsolete-comment-of-__add_pages.patch
mm-memory_hotplug-avoid-calling-zone_intersects-for-zone_normal.patch
mm-memory_hotplug-clean-up-try_offline_node.patch
mm-memory_hotplug-fix-misplaced-comment-in-offline_pages.patch
mm-highmem-remove-unnecessary-done-label.patch
mm-hmmc-remove-unneeded-local-variable-ret.patch
kernel-ksysfsc-use-helper-macro-__attr_rw.patch
kernel-resource-fix-kfree-of-bootmem-memory-again.patch
mm-huge_memory-make-is_transparent_hugepage-static.patch