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    SubjectRe: 3.14-mw regression: rtl8169 WARNING: DMA-API: exceeded 7 overlapping mappings of pfn 55ebe
    Sander Eikelenboom <linux@eikelenboom.it> :
    [...]
    > I have got a regression with a 3.14-mw kernel (last commit is 4ba9920e5e9c0e16b5ed24292d45322907bb9035):
    > It looks like it's related to the rtl8169 ...
    >
    > --
    > Sander
    >
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.105537] ------------[ cut here ]------------
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.116779] WARNING: CPU: 0 PID: 0 at lib/dma-debug.c:491 add_dma_entry+0x103/0x130()
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.128148] DMA-API: exceeded 7 overlapping mappings of pfn 55ebe
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.139397] Modules linked in:
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.150535] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.13.0-20140125-mw-pcireset+ #1
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.161784] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640) , BIOS V1.8B1 09/13/2010
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.172965] 0000000000000009 ffff88005f603838 ffffffff81acbcfa ffffffff822134e0
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.184156] ffff88005f603888 ffff88005f603878 ffffffff810bdf62 ffff880000000000
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.195186] 0000000000055ebe 00000000ffffffef 0000000000000200 ffff8800592ea098
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.206227] Call Trace:
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.217027] <IRQ> [<ffffffff81acbcfa>] dump_stack+0x46/0x58
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.227907] [<ffffffff810bdf62>] warn_slowpath_common+0x82/0xb0
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.238678] [<ffffffff810be031>] warn_slowpath_fmt+0x41/0x50
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.249336] [<ffffffff81471c5a>] ? active_pfn_read_overlap+0x3a/0x70
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.259904] [<ffffffff814729e3>] add_dma_entry+0x103/0x130
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.270416] [<ffffffff81472de6>] debug_dma_map_page+0x126/0x150
    > Jan 26 11:36:26 serveerstertje kernel: [ 89.280840] [<ffffffff81714686>] rtl8169_start_xmit+0x216/0xa20
    [r8169 and xen stuff]

    Dan, I miss the part of the debug code that tells where the mappings were
    previously set.

    --
    Ueimor


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