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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/lib/list_debug.c
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@@ -20,7 +20,11 @@
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 bool __list_add_valid(struct list_head *new, struct list_head *prev,
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 		      struct list_head *next)
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 {
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-	if (CHECK_DATA_CORRUPTION(next->prev != prev,
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+	if (CHECK_DATA_CORRUPTION(prev == NULL,
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+			"list_add corruption. prev is NULL.\n") ||
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+	    CHECK_DATA_CORRUPTION(next == NULL,
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+			"list_add corruption. next is NULL.\n") ||
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+	    CHECK_DATA_CORRUPTION(next->prev != prev,
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 			"list_add corruption. next->prev should be prev (%px), but was %px. (next=%px).\n",
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 			prev, next->prev, next) ||
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 	    CHECK_DATA_CORRUPTION(prev->next != next,
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@@ -42,7 +46,11 @@
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 	prev = entry->prev;
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 	next = entry->next;
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-	if (CHECK_DATA_CORRUPTION(next == LIST_POISON1,
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+	if (CHECK_DATA_CORRUPTION(next == NULL,
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+			"list_del corruption, %px->next is NULL\n", entry) ||
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+	    CHECK_DATA_CORRUPTION(prev == NULL,
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+			"list_del corruption, %px->prev is NULL\n", entry) ||
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+	    CHECK_DATA_CORRUPTION(next == LIST_POISON1,
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 			"list_del corruption, %px->next is LIST_POISON1 (%px)\n",
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 			entry, LIST_POISON1) ||
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 	    CHECK_DATA_CORRUPTION(prev == LIST_POISON2,