Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:37267 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751284AbcGSUIJ (ORCPT ); Tue, 19 Jul 2016 16:08:09 -0400 From: "Benjamin Coddington" To: "hch@infradead.org" Cc: "Trond Myklebust" , "linux-nfs@vger.kernel.org" Subject: Re: [PATCH v4 24/28] Getattr doesn't require data sync semantics Date: Tue, 19 Jul 2016 16:09:42 -0400 Message-ID: In-Reply-To: References: <1467844205-76852-19-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-20-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-21-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-22-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-23-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-24-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-25-git-send-email-trond.myklebust@primarydata.com> <20160718034847.GA1195@infradead.org> <1468817945.5273.2.camel@primarydata.com> <20160719035843.GA24437@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; format=flowed Sender: linux-nfs-owner@vger.kernel.org List-ID: On 19 Jul 2016, at 16:00, Benjamin Coddington wrote: > On 18 Jul 2016, at 23:58, hch@infradead.org wrote: > >> On Mon, Jul 18, 2016 at 04:59:09AM +0000, Trond Myklebust wrote: >>> Actually... The problem might be that a previous attribute update is >>> marking the attribute cache as being revalidated. Does the following >>> patch help? >> >> It doesn't. Also with your most recent linux-next branch the test >> now cause the systems to OOM with or without your patch (with mine >> it's >> still fine). I tested with your writeback branch from about two or >> three days ago before, and with that + your patch it also 'just >> fails' >> and doesn't OOM. Looks like whatever causes the bug also creates >> a temporarily memory leak when combined with recent changes from your >> tree, most likely something from the pnfs branch. > > I couldn't find the memory leak using kmemleak, but it OOMs pretty > quick. If I > insert an mdelay(200) just after the lookup_again: marker in > pnfs_update_layout() it doesn't OOM, but it seems stuck forever in a > loop on > that marker: > > [ 1230.635586] pnfs_find_alloc_layout Begin ino=ffff88003ef986f8 > layout=ffff8800392bca58 > [ 1230.636729] pnfs_find_lseg:Begin > [ 1230.637538] pnfs_find_lseg:Return lseg (null) ref 0 > [ 1230.638582] --> send_layoutget > [ 1230.639499] --> nfs4_proc_layoutget > [ 1230.640525] --> nfs4_layoutget_prepare > [ 1230.641479] --> nfs41_setup_sequence > [ 1230.641581] <-- nfs4_proc_layoutget status=-512 > [ 1230.643288] --> nfs4_alloc_slot used_slots=0000 > highest_used=4294967295 max_slots=31 > [ 1230.644348] <-- nfs4_alloc_slot used_slots=0001 highest_used=0 > slotid=0 > [ 1230.645373] <-- nfs41_setup_sequence slotid=0 seqid=4376 > [ 1230.646356] <-- nfs4_layoutget_prepare > [ 1230.647357] encode_sequence: sessionid=1468956665:2:3:0 seqid=4376 > slotid=0 max_slotid=0 cache_this=0 > [ 1230.648522] encode_layoutget: 1st type:0x5 iomode:2 off:122880 > len:4096 mc:4096 > [ 1230.650182] decode_layoutget roff:122880 rlen:4096 riomode:2, > lo_type:0x5, lo.len:48 > [ 1230.651331] --> nfs4_layoutget_done > [ 1230.652233] --> nfs4_alloc_slot used_slots=0001 highest_used=0 > max_slots=31 > [ 1230.653409] <-- nfs4_alloc_slot used_slots=0003 highest_used=1 > slotid=1 > [ 1230.654547] nfs4_free_slot: slotid 1 highest_used_slotid 0 > [ 1230.655606] nfs41_sequence_done: Error 0 free the slot > [ 1230.656635] nfs4_free_slot: slotid 0 highest_used_slotid 4294967295 > [ 1230.657739] <-- nfs4_layoutget_done > [ 1230.658650] --> nfs4_layoutget_release > [ 1230.659626] <-- nfs4_layoutget_release > > This debug output is identical for every cycle of the loop. Except for the monotonically incrementing sequence id! sorry.. :/ Ben