mm/hwpoison: fix panic due to split huge zero page

[cascardo/linux.git] / mm / memory-failure.c

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index dba52ee..1f4446a 100644 (file)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1146,8 +1146,11 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
        }
 
        if (!PageHuge(p) && PageTransHuge(hpage)) {
-               if (unlikely(split_huge_page(hpage))) {
-                       pr_err("MCE: %#lx: thp split failed\n", pfn);
+               if (!PageAnon(hpage) || unlikely(split_huge_page(hpage))) {
+                       if (!PageAnon(hpage))
+                               pr_err("MCE: %#lx: non anonymous thp\n", pfn);
+                       else
+                               pr_err("MCE: %#lx: thp split failed\n", pfn);
                        if (TestClearPageHWPoison(p))
                                atomic_long_sub(nr_pages, &num_poisoned_pages);
                        put_page(p);