From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f176.google.com (mail-wi0-f176.google.com [209.85.212.176]) by kanga.kvack.org (Postfix) with ESMTP id D55446B0036 for ; Thu, 22 May 2014 11:41:12 -0400 (EDT) Received: by mail-wi0-f176.google.com with SMTP id n15so9470735wiw.3 for ; Thu, 22 May 2014 08:41:12 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTP id vo4si164407wjc.40.2014.05.22.08.41.10 for ; Thu, 22 May 2014 08:41:11 -0700 (PDT) Date: Thu, 22 May 2014 11:41:00 -0400 From: Dave Jones Subject: Re: 3.15.0-rc6: VM_BUG_ON_PAGE(PageTail(page), page) Message-ID: <20140522154100.GA30273@redhat.com> References: <20140522135828.GA24879@redhat.com> <537E12D9.6090709@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <537E12D9.6090709@suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: Vlastimil Babka Cc: Linux Kernel , linux-mm@kvack.org, Linus Torvalds On Thu, May 22, 2014 at 05:08:09PM +0200, Vlastimil Babka wrote: > > RIP: 0010:[] [] PageTransHuge.part.23+0xb/0xd > > Call Trace: > > [] isolate_migratepages_range+0x7a3/0x870 > > [] compact_zone+0x370/0x560 > > [] compact_zone_order+0xa2/0x110 > > [] try_to_compact_pages+0x101/0x130 > > ... > > Code: 75 1d 55 be 6c 00 00 00 48 c7 c7 8a 2f a2 bb 48 89 e5 e8 6c 49 95 ff 5d c6 05 74 16 65 00 01 c3 55 31 f6 48 89 e5 e8 28 bd a3 ff <0f> 0b 0f 1f 44 00 00 55 48 89 e5 41 57 45 31 ff 41 56 49 89 fe > > RIP [] > > > > That BUG is.. > > > > 413 static inline int PageTransHuge(struct page *page) > > 414 { > > 415 VM_BUG_ON_PAGE(PageTail(page), page); > > 416 return PageHead(page); > > 417 } > > Any idea which of the two PageTransHuge() calls in > isolate_migratepages_range() that is? Offset far in the function suggest > it's where the lru lock is already held, but I'm not sure as decodecode > of your dump and objdump of my own compile look widely different. Yeah, the only thing the code: matches is the BUG() which is in another section. (see end of file at http://paste.fedoraproject.org/104155/40077293/raw/) Maybe you can make more sense of that disassembly than I can.. 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