From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-f72.google.com (mail-lf0-f72.google.com [209.85.215.72]) by kanga.kvack.org (Postfix) with ESMTP id 11FFC6B03AD for ; Mon, 12 Jun 2017 08:23:55 -0400 (EDT) Received: by mail-lf0-f72.google.com with SMTP id 95so17674478lfq.5 for ; Mon, 12 Jun 2017 05:23:55 -0700 (PDT) Received: from mail-lf0-x242.google.com (mail-lf0-x242.google.com. [2a00:1450:4010:c07::242]) by mx.google.com with ESMTPS id e31si5074172lji.208.2017.06.12.05.23.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 12 Jun 2017 05:23:52 -0700 (PDT) Received: by mail-lf0-x242.google.com with SMTP id v20so9366561lfa.2 for ; Mon, 12 Jun 2017 05:23:52 -0700 (PDT) Date: Mon, 12 Jun 2017 14:23:36 +0200 From: Rabin Vincent Subject: Re: [4.9.28] vmscan: shrink_slab: ext4_es_scan+0x0/0x150 negative objects to delete nr=-2147483624 Message-ID: <20170612122336.GA17592@lnxrabinv.se.axis.com> References: <20170518052149.GA953@local.marc.ngoe.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170518052149.GA953@local.marc.ngoe.de> Sender: owner-linux-mm@kvack.org List-ID: To: Marc Burkhardt , shli@fb.com, mhocko@suse.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org On Thu, May 18, 2017 at 07:21:49AM +0200, Marc Burkhardt wrote: > tonight my dmesg was flooded with mesages like > > vmscan: shrink_slab: ext4_es_scan+0x0/0x150 negative objects to delete nr=-2147483624 > > Is that an integer overflow happening in ext4? > > It's the first time I see this message. Any help on how to debug/reprocude this > are appreciated. Please advice if you want me to investigate this. I haven't attempted to debug nor reproduce it, but what I can tell you is that it does not not have anything to with ext4. I've seen similar messages with a completely different slab, on 4.9.26: [367594.725081] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482285 [367595.046073] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147479427 [367595.279228] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482317 [367595.459529] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482353 [367595.497191] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482386 [367595.521578] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482413 [367595.551109] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482501 [367598.344400] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482458 [367598.369103] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482493 [367598.403148] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482521 [367598.422815] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482611 [367598.524128] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147483238 [367601.554775] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482245 [367601.582922] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482279 [367601.620175] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482307 [367602.958946] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147479516 [367603.630417] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482412 [367603.746885] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482512 [367603.769490] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482217 [367604.155461] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147479940 [367604.174624] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482635 [367604.197573] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482595 I don't see any fixes/changes to mm/vmscan.c in newer 4.9-stable kernels other than these ones which were already merged v4.9.14: $ git shortlog v4.9..v4.9.30 -- mm/vmscan.c Michal Hocko (3): mm, memcg: fix the active list aging for lowmem requests when memcg is enabled mm, vmscan: cleanup lru size claculations mm, vmscan: consider eligible zones in get_scan_count Shaohua Li (1): mm/vmscan.c: set correct defer count for shrinker Perhaps one of the above people or someone else in linux-mm recognizes this. -- 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