1 files changed, 23 insertions, 1 deletions

diff --git a/mm/slab.c b/mm/slab.c
index 792bfe320a8b..3dbd6f4e7477 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1683,10 +1683,32 @@ static void poison_obj(struct kmem_cache *cachep, void *addr, unsigned char val)
 static void dump_line(char *data, int offset, int limit)
 {
         int i;
+        unsigned char error = 0;
+        int bad_count = 0;
+
         printk(KERN_ERR "%03x:", offset);
-        for (i = 0; i < limit; i++)
+        for (i = 0; i < limit; i++) {
+                if (data[offset + i] != POISON_FREE) {
+                        error = data[offset + i];
+                        bad_count++;
+                }
                 printk(" %02x", (unsigned char)data[offset + i]);
+        }
         printk("\n");
+
+        if (bad_count == 1) {
+                error ^= POISON_FREE;
+                if (!(error & (error - 1))) {
+                        printk(KERN_ERR "Single bit error detected. Probably "
+                                        "bad RAM.\n");
+#ifdef CONFIG_X86
+                        printk(KERN_ERR "Run memtest86+ or a similar memory "
+                                        "test tool.\n");
+#else
+                        printk(KERN_ERR "Run a memory test tool.\n");
+#endif
+                }
+        }
 }
 #endif