The patch titled
Subject: ipc/ipc_sysctl.c:put_pages_list(): reinitialise the page list
has been added to the -mm tree. Its filename is
hitting-bug_on-trap-in-read_pages-mm-optimise-put_pages_list.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/hitting-bug_on-trap-in-read_pages-mm-optimise-put_pages_list.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/hitting-bug_on-trap-in-read_pages-mm-optimise-put_pages_list.patch
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------------------------------------------------------
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Subject: ipc/ipc_sysctl.c:put_pages_list(): reinitialise the page list
While free_unref_page_list() puts pages onto the CPU local LRU list, it
does not remove them from the list they were passed in on. That makes the
list_head appear to be non-empty, and would lead to various corruption
problems if we didn't have an assertion that the list was empty.
Reinitialise the list after calling free_unref_page_list() to avoid this
problem.
Link: https://lkml.kernel.org/r/YYp40A2lNrxaZji8@xxxxxxxxxxxxxxxxxxxx
Fixes: 988c69f1bc23 ("mm: optimise put_pages_list()")
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reported-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Tested-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Cc: Steve French <smfrench@xxxxxxxxx>
Cc: Hyeoncheol Lee <hyc.lee@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/swap.c | 1 +
1 file changed, 1 insertion(+)
--- a/mm/swap.c~hitting-bug_on-trap-in-read_pages-mm-optimise-put_pages_list
+++ a/mm/swap.c
@@ -155,6 +155,7 @@ void put_pages_list(struct list_head *pa
}
free_unref_page_list(pages);
+ INIT_LIST_HEAD(pages);
}
EXPORT_SYMBOL(put_pages_list);
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-move-kvmalloc-related-functions-to-slabh.patch
kasan-fix-tag-for-large-allocations-when-using-config_slab.patch
mm-remove-bogus-vm_bug_on.patch
mm-optimise-put_pages_list.patch
hitting-bug_on-trap-in-read_pages-mm-optimise-put_pages_list.patch
