Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754425AbaBFO0N (ORCPT ); Thu, 6 Feb 2014 09:26:13 -0500 Received: from mail-vb0-f49.google.com ([209.85.212.49]:41373 "EHLO mail-vb0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751743AbaBFO0K (ORCPT ); Thu, 6 Feb 2014 09:26:10 -0500 MIME-Version: 1.0 In-Reply-To: <942972114.20140206140909@eikelenboom.it> References: <1859471893.20140126115521@eikelenboom.it> <20140127000305.GA14236@electric-eye.fr.zoreil.com> <84816226.20140206123631@eikelenboom.it> <942972114.20140206140909@eikelenboom.it> Date: Thu, 6 Feb 2014 06:26:09 -0800 Message-ID: Subject: Re: 3.14-mw regression: rtl8169 WARNING: DMA-API: exceeded 7 overlapping mappings of pfn 55ebe From: Dan Williams To: Sander Eikelenboom Cc: Konrad Rzeszutek Wilk , Wei Liu , Francois Romieu , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 6, 2014 at 5:09 AM, Sander Eikelenboom wrote: > Hmm ok that last message was false .. sorry for that .. it did happen again without r8169.use_dac=1, it just doesn't seem to happen all the time... > > Konrad / Wei, do you happen to know of any xen related change that went into 3.14 merge window that relates to dma / xen networking ? > > -- > Sander > > complete stacktrace: > > [ 342.710738] ------------[ cut here ]------------ > [ 342.726890] WARNING: CPU: 0 PID: 0 at lib/dma-debug.c:491 add_dma_entry+0x105/0x130() > [ 342.743210] DMA-API: exceeded 7 overlapping mappings of pfn 40b00 > [ 342.759510] Modules linked in: > [ 342.775557] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.0-rc1-20140206-pcireset-net-btrevert+ #1 > [ 342.791706] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640) , BIOS V1.8B1 09/13/2010 > [ 342.807627] 0000000000000009 ffff88005f603828 ffffffff81ad29fc ffffffff822134e0 > [ 342.823430] ffff88005f603878 ffff88005f603868 ffffffff810bdf62 ffff880000000000 > [ 342.839081] 0000000000040b00 00000000ffffffef ffffffff822102e0 ffff8800592b9098 > [ 342.854572] Call Trace: > [ 342.869748] [] dump_stack+0x46/0x58 > [ 342.884915] [] warn_slowpath_common+0x82/0xb0 > [ 342.899710] [] warn_slowpath_fmt+0x41/0x50 > [ 342.914395] [] ? active_pfn_read_overlap+0x3a/0x70 > [ 342.929166] [] add_dma_entry+0x105/0x130 > [ 342.943733] [] debug_dma_map_page+0x126/0x150 > [ 342.957988] [] rtl8169_start_xmit+0x216/0xa20 > [ 342.972306] [] ? dev_queue_xmit_nit+0x1ef/0x260 > [ 342.986523] [] ? dev_loopback_xmit+0x1e0/0x1e0 > [ 343.000689] [] dev_hard_start_xmit+0x2e6/0x4a0 > [ 343.014466] [] sch_direct_xmit+0xfe/0x280 > [ 343.028052] [] __dev_queue_xmit+0x23c/0x630 > [ 343.041338] [] ? dev_hard_start_xmit+0x4a0/0x4a0 > [ 343.054483] [] ? ip_output+0x54/0xf0 > [ 343.067659] [] dev_queue_xmit+0xb/0x10 > [ 343.080804] [] ip_finish_output+0x2cb/0x670 > [ 343.093746] [] ? ip_output+0x54/0xf0 > [ 343.106391] [] ip_output+0x54/0xf0 > [ 343.118683] [] ip_forward_finish+0x71/0x1a0 > [ 343.130901] [] ip_forward+0x1a3/0x440 > [ 343.142829] [] ? lock_is_held+0x8b/0xb0 > [ 343.154346] [] ip_rcv_finish+0x150/0x660 > [ 343.165748] [] ip_rcv+0x22b/0x370 > [ 343.176838] [] ? packet_rcv_spkt+0x42/0x190 > [ 343.187659] [] __netif_receive_skb_core+0x6d2/0x8a0 > [ 343.198209] [] ? __netif_receive_skb_core+0x114/0x8a0 > [ 343.208819] [] ? xen_clocksource_read+0x20/0x30 > [ 343.219471] [] ? getnstimeofday+0x9/0x30 > [ 343.229862] [] __netif_receive_skb+0x1c/0x70 > [ 343.239953] [] netif_receive_skb_internal+0x1e/0xf0 > [ 343.249908] [] napi_gro_receive+0x70/0xa0 > [ 343.259509] [] rtl8169_poll+0x2d3/0x680 > [ 343.268982] [] ? _raw_spin_unlock_irq+0x2b/0x50 > [ 343.278091] [] net_rx_action+0x161/0x260 > [ 343.287056] [] __do_softirq+0x12c/0x280 > [ 343.295756] [] irq_exit+0xa2/0xd0 > [ 343.304235] [] xen_evtchn_do_upcall+0x2f/0x40 > [ 343.312387] [] xen_do_hypervisor_callback+0x1e/0x30 > [ 343.320389] [] ? xen_hypercall_sched_op+0xa/0x20 > [ 343.328171] [] ? xen_hypercall_sched_op+0xa/0x20 > [ 343.335738] [] ? xen_safe_halt+0x10/0x20 > [ 343.343142] [] ? default_idle+0x18/0x20 > [ 343.350202] [] ? arch_cpu_idle+0x2e/0x40 > [ 343.356994] [] ? cpu_startup_entry+0x91/0x1e0 > [ 343.363658] [] ? rest_init+0xb7/0xc0 > [ 343.369924] [] ? csum_partial_copy_generic+0x170/0x170 > [ 343.376057] [] ? start_kernel+0x409/0x416 > [ 343.381972] [] ? repair_env_string+0x5e/0x5e > [ 343.387573] [] ? x86_64_start_reservations+0x2a/0x2c > [ 343.393152] [] ? xen_start_kernel+0x586/0x588 > [ 343.398628] ---[ end trace 8379b598fb7ef5ee ]--- > > > > > > Thursday, February 6, 2014, 12:36:31 PM, you wrote: > >> Hi Dan / Francois, > >> Didn't have time to test it before, but the patch doesn't seem to help. >> I'm still getting the "DMA-API: exceeded 7 overlapping mappings of pfn 55ebe", >> but i see now i forgot to mention i use r8169.use_dac=1 ... > >> Not using it seems to prevent the warning, but before 3.14 i have never seen this (with r8169.use_dac=1) If you are still hitting this with the patch: 59f2e7df574c dma-debug: fix overlap detection ...then I'm more inclined to think it is an actual positive report. If you don't mind I'll send some debug patches to narrow this down. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/