From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx123.postini.com [74.125.245.123]) by kanga.kvack.org (Postfix) with SMTP id 405106B0092 for ; Tue, 28 May 2013 21:42:51 -0400 (EDT) Received: by mail-la0-f48.google.com with SMTP id fs12so8137280lab.35 for ; Tue, 28 May 2013 18:42:49 -0700 (PDT) MIME-Version: 1.0 From: Andy Lutomirski Date: Tue, 28 May 2013 18:42:28 -0700 Message-ID: Subject: SIGBUS accessing MAP_HUGETLB space w/ nr_overcommit == 0 Content-Type: text/plain; charset=ISO-8859-1 Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org I switched a system from Linux 3.5 to 3.9.4, and I have some crashes that I didn't have before. The cause is a SIGBUS w/ code BUS_ADRERR on what I presume is the first access to a MAP_HUGETLB | MAP_PRIVATE page. I have nr_overcommit_hugepages == 0, so this shouldn't happen. There are no kernel log messages at all. Is there possibly a regression here? Nothing seems to be asserting any invariants with respect to the freelist size and the number of accounted free hugepages. I do not have CONFIG_CGROUP_HUGETLB set. Thanks, Andy -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org