Thursday, February 6, 2014, 3:26:09 PM, you wrote:

On Thu, Feb 6, 2014 at 5:09 AM, Sander Eikelenboom [off-list ref] wrote:

quoted

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]  <IRQ>  [<ffffffff81ad29fc>] dump_stack+0x46/0x58
[  342.884915]  [<ffffffff810bdf62>] warn_slowpath_common+0x82/0xb0
[  342.899710]  [<ffffffff810be031>] warn_slowpath_fmt+0x41/0x50
[  342.914395]  [<ffffffff8147853a>] ? active_pfn_read_overlap+0x3a/0x70
[  342.929166]  [<ffffffff814792c5>] add_dma_entry+0x105/0x130
[  342.943733]  [<ffffffff814796c6>] debug_dma_map_page+0x126/0x150
[  342.957988]  [<ffffffff8171c8b6>] rtl8169_start_xmit+0x216/0xa20
[  342.972306]  [<ffffffff8195f08f>] ? dev_queue_xmit_nit+0x1ef/0x260
[  342.986523]  [<ffffffff8195eea0>] ? dev_loopback_xmit+0x1e0/0x1e0
[  343.000689]  [<ffffffff819631e6>] dev_hard_start_xmit+0x2e6/0x4a0
[  343.014466]  [<ffffffff81980f3e>] sch_direct_xmit+0xfe/0x280
[  343.028052]  [<ffffffff819635dc>] __dev_queue_xmit+0x23c/0x630
[  343.041338]  [<ffffffff819633a0>] ? dev_hard_start_xmit+0x4a0/0x4a0
[  343.054483]  [<ffffffff81a0a334>] ? ip_output+0x54/0xf0
[  343.067659]  [<ffffffff819639eb>] dev_queue_xmit+0xb/0x10
[  343.080804]  [<ffffffff81a0890b>] ip_finish_output+0x2cb/0x670
[  343.093746]  [<ffffffff81a0a334>] ? ip_output+0x54/0xf0
[  343.106391]  [<ffffffff81a0a334>] ip_output+0x54/0xf0
[  343.118683]  [<ffffffff81a05791>] ip_forward_finish+0x71/0x1a0
[  343.130901]  [<ffffffff81a05a63>] ip_forward+0x1a3/0x440
[  343.142829]  [<ffffffff810ffebb>] ? lock_is_held+0x8b/0xb0
[  343.154346]  [<ffffffff81a035c0>] ip_rcv_finish+0x150/0x660
[  343.165748]  [<ffffffff81a0406b>] ip_rcv+0x22b/0x370
[  343.176838]  [<ffffffff81a60972>] ? packet_rcv_spkt+0x42/0x190
[  343.187659]  [<ffffffff819609d2>] __netif_receive_skb_core+0x6d2/0x8a0
[  343.198209]  [<ffffffff81960414>] ? __netif_receive_skb_core+0x114/0x8a0
[  343.208819]  [<ffffffff81009010>] ? xen_clocksource_read+0x20/0x30
[  343.219471]  [<ffffffff81116e49>] ? getnstimeofday+0x9/0x30
[  343.229862]  [<ffffffff81960bbc>] __netif_receive_skb+0x1c/0x70
[  343.239953]  [<ffffffff81960c2e>] netif_receive_skb_internal+0x1e/0xf0
[  343.249908]  [<ffffffff81962110>] napi_gro_receive+0x70/0xa0
[  343.259509]  [<ffffffff817198a3>] rtl8169_poll+0x2d3/0x680
[  343.268982]  [<ffffffff81adcd2b>] ? _raw_spin_unlock_irq+0x2b/0x50
[  343.278091]  [<ffffffff819610d1>] net_rx_action+0x161/0x260
[  343.287056]  [<ffffffff810c28ec>] __do_softirq+0x12c/0x280
[  343.295756]  [<ffffffff810c2da2>] irq_exit+0xa2/0xd0
[  343.304235]  [<ffffffff814ffd5f>] xen_evtchn_do_upcall+0x2f/0x40
[  343.312387]  [<ffffffff81adf15e>] xen_do_hypervisor_callback+0x1e/0x30
[  343.320389]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  343.328171]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  343.335738]  [<ffffffff81008c70>] ? xen_safe_halt+0x10/0x20
[  343.343142]  [<ffffffff81018748>] ? default_idle+0x18/0x20
[  343.350202]  [<ffffffff81018f5e>] ? arch_cpu_idle+0x2e/0x40
[  343.356994]  [<ffffffff8110b551>] ? cpu_startup_entry+0x91/0x1e0
[  343.363658]  [<ffffffff81ac7d87>] ? rest_init+0xb7/0xc0
[  343.369924]  [<ffffffff81ac7cd0>] ? csum_partial_copy_generic+0x170/0x170
[  343.376057]  [<ffffffff8230ff1c>] ? start_kernel+0x409/0x416
[  343.381972]  [<ffffffff8230f912>] ? repair_env_string+0x5e/0x5e
[  343.387573]  [<ffffffff8230f5f8>] ? x86_64_start_reservations+0x2a/0x2c
[  343.393152]  [<ffffffff82312e28>] ? xen_start_kernel+0x586/0x588
[  343.398628] ---[ end trace 8379b598fb7ef5ee ]---





Thursday, February 6, 2014, 12:36:31 PM, you wrote:

quoted

Hi Dan / Francois,

quoted

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 ...

quoted

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.

Please do .. sounds better than bisecting :-)