From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qa0-f54.google.com (mail-qa0-f54.google.com [209.85.216.54]) by kanga.kvack.org (Postfix) with ESMTP id 77BCE6B0095 for ; Fri, 6 Jun 2014 13:51:33 -0400 (EDT) Received: by mail-qa0-f54.google.com with SMTP id j15so4322701qaq.41 for ; Fri, 06 Jun 2014 10:51:33 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTP id e3si14291883qaa.112.2014.06.06.10.51.32 for ; Fri, 06 Jun 2014 10:51:32 -0700 (PDT) Date: Fri, 6 Jun 2014 13:51:25 -0400 From: Dave Jones Subject: Re: 3.15-rc8 oops in copy_page_rep after page fault. Message-ID: <20140606175125.GB1741@redhat.com> References: <20140606174317.GA1741@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140606174317.GA1741@redhat.com> Sender: owner-linux-mm@kvack.org List-ID: To: Linux Kernel , linux-mm@kvack.org, Linus Torvalds On Fri, Jun 06, 2014 at 01:43:17PM -0400, Dave Jones wrote: > Not much to go on here. It rebooted right after dumping this. > > RIP: 0010:[] [] copy_page_rep+0x5/0x10 > Call Trace: > [] ? do_huge_pmd_wp_page+0x5cb/0x850 > [] handle_mm_fault+0x1e0/0xc50 > [] ? kmem_cache_free+0x1c2/0x200 > [] __do_page_fault+0x1c9/0x630 > [] ? perf_trace_sys_enter+0x38/0x180 > [] ? __acct_update_integrals+0x8b/0x120 > [] ? preempt_count_sub+0xab/0x100 > [] do_page_fault+0x1e/0x70 > [] page_fault+0x22/0x30 Ok, I can reproduce this fairly easily. The only prerequisite seems to be that before I start the fuzzer I do.. echo 65536 > /proc/sys/vm/mmap_min_addr If I don't do that, then it seems to survive, so maybe that's a clue ? Dave -- 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