[PATCH] arm64, numa: Add cpu_to_node() implementation.

[Mark Rutland]

On Tue, Sep 20, 2016 at 12:43:48PM +0200, Robert Richter wrote:
> Unfortunately either your nor my code does fix the BUG_ON() I see with
> the numa kernel:
> 
>  kernel BUG at mm/page_alloc.c:1848!
> 
> See below for the core dump. It looks like this happens due to moving
> a mem block where first and last page are mapped to different numa
> nodes, thus, triggering the BUG_ON().

FWIW, I'm seeing a potentially-related BUG in the same function on a
v4.8-rc7 kernel without CONFIG_NUMA enabled. I have a number of debug
options set, including CONFIG_PAGE_POISONING and CONFIG_DEBUG_PAGEALLOC.

I've included the full log for that below, including subsequent
failures.

I'm triggering this by running $(hackbench 100 process 1000).

Thanks,
Mark.

[  742.923329] ------------[ cut here ]------------
[  742.927951] kernel BUG at mm/page_alloc.c:1844!
[  742.932475] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[  742.937951] Modules linked in:
[  742.941075] CPU: 4 PID: 3608 Comm: hackbench Not tainted 4.8.0-rc7 #1
[  742.947506] Hardware name: AMD Seattle (Rev.B0) Development Board (Overdrive) (DT)
[  742.955066] task: ffff800341c4af80 task.stack: ffff800341c84000
[  742.960981] PC is at move_freepages+0x220/0x338
[  742.965503] LR is at move_freepages_block+0x164/0x1e0
[  742.970544] pc : [<ffff2000083dfeb8>] lr : [<ffff2000083e0134>] pstate: 200001c5
[  742.977928] sp : ffff800341c86ce0
[  742.981233] x29: ffff800341c86ce0 x28: ffff20000c8d9308
[  742.986541] x27: ffff7e000ffbffc0 x26: 0000000000000100
[  742.991850] x25: 0000000000000000 x24: 00000000083fefff
[  742.997157] x23: ffff7e000ffb8000 x22: ffff20000c8d9000
[  743.002465] x21: ffff20000c8d9000 x20: 0000000000000700
[  743.007772] x19: ffff7e000ffb8000 x18: 0000000000000000
[  743.013079] x17: 0000000000000001 x16: ffff200008553d78
[  743.018387] x15: 0000000000000002 x14: 0000000000000000
[  743.023694] x13: ffffffffffffffff x12: ffff20000b311000
[  743.029000] x11: 0000000000000000 x10: ffff20000d540000
[  743.034307] x9 : dfff200000000000 x8 : ffff20000c8d9318
[  743.039614] x7 : 0000000000000001 x6 : 1fffe4000149ab66
[  743.044921] x5 : dfff200000000000 x4 : ffff20000a4d5b30
[  743.050228] x3 : 0000000000000000 x2 : ffff7e000ffbffc0
[  743.055535] x1 : 0000000000000000 x0 : 0000000000000000
[  743.060841]
[  743.062324] Process hackbench (pid: 3608, stack limit = 0xffff800341c84020)
[  743.069276] Stack: (0xffff800341c86ce0 to 0xffff800341c88000)
[  743.075013] 6ce0: ffff800341c86d70 ffff2000083e0134 00000000083fee00 ffff7e000ffb8000
[  743.082833] 6d00: ffff20000c8d9000 0000000008400000 ffff7e000ffb8000 00000000083fefff
[  743.090653] 6d20: 0000000000000000 0000000000000100 ffff20000a9873a0 ffff20000c8d9308
[  743.098472] 6d40: 0000000000000000 0000000000000003 0000000000000005 ffff20000c8d9000
[  743.106292] 6d60: 0000000000000000 0000000000000100 ffff800341c86dc0 ffff2000083e11bc
[  743.114111] 6d80: 0000000000000005 0000000000000001 0000000000000000 0000000000000003
[  743.121930] 6da0: 0000000000000005 ffff20000c8d9000 ffff20000b311000 1ffff000683896e8
[  743.129750] 6dc0: ffff800341c86f50 ffff2000083e41fc 0000000000000003 ffff800341c873a0
[  743.137570] 6de0: 00000000002156c0 0000000000000008 dfff200000000000 ffff20000a4d5000
[  743.145389] 6e00: 0000000000000000 00000000002156c0 dfff200000000000 ffff20000c8d9000
[  743.153209] 6e20: ffff800341c86ee0 ffff2000081b3758 0000000000000001 ffff800341c84000
[  743.161028] 6e40: 0000000000000000 ffff7e000ffbb000 1ffff00068390dce ffff800341c86f50
[  743.168848] 6e60: ffff7e000ffbb020 ffff7e000ffbb000 0000000041b58ab3 ffff20000a2777d8
[  743.176668] 6e80: ffff2000083e06f8 000000000000b394 ffff800341c86e01 ffff20000823cd10
[  743.184487] 6ea0: ffff20000b311000 00000000000001c0 ffff20000c8d9598 00000000002156c0
[  743.192307] 6ec0: dfff200000000000 0000000000000000 ffff800341c86f20 ffff200009c28074
[  743.200126] 6ee0: ffff20000c8d9580 0000000000000140 ffff2000083e41c8 0000000000000001
[  743.207946] 6f00: dfff200000000000 ffff20000a4d5000 0000000000000000 0000000000000000
[  743.215765] 6f20: ffff800341c86f50 ffff2000083e41c8 ffff20000c8d96e8 ffff800341c873a0
[  743.223585] 6f40: 00000000002156c0 ffff2000083e4884 ffff800341c87160 ffff2000083e74d4
[  743.231404] 6f60: ffff800341c4af80 ffff800341c873a0 00000000002156c0 0000000000000001
[  743.239224] 6f80: dfff200000000000 ffff20000a4d5000 0000000000000000 00000000002156c0
[  743.247043] 6fa0: 1ffff00068390e50 0000000000000001 00000000002156c0 ffff20000a9827c0
[  743.254863] 6fc0: ffff800341c873b0 0000000000000003 0000000000000268 00000008002156c0
[  743.262682] 6fe0: 1ffff00068390e18 0000000000000001 ffff8003ffef9000 0000000000000008
[  743.270501] 7000: ffff8003002156c0 0000000000000002 0000000000000000 ffff200008236b1c
[  743.278321] 7020: ffff800341c870a0 1ffff00068390e76 0000000000000140 ffff800341c4b740
[  743.286141] 7040: ffff800300000003 ffff200008236b1c ffff800341c870e0 ffff200008236b1c
[  743.293960] 7060: ffff800341c870e0 ffff200008236dac 0000000000000040 ffff800341c4b740
[  743.301780] 7080: ffff800341c87110 ffff20000c8d9e00 ffff20000c8d9580 ffff20000c8d9268
[  743.309599] 70a0: 0000000000000000 ffff800341c873a0 0000000000000000 ffff20000c8d9000
[  743.317419] 70c0: 0000000041b58ab3 ffff20000a266f80 ffff2000083e37c8 1ffff00068390e4a
[  743.325239] 70e0: ffff800341c4af80 0000000000000000 ffff800341c4af80 00000000000001c0
[  743.333058] 7100: ffff800341c87130 ffff20000823f928 ffff20000b311000 00000000002156c0
[  743.340878] 7120: 0000000000000140 00000000000001c0 ffff800341c87160 ffff2000083e71dc
[  743.348698] 7140: ffff8003ffdf4680 00000000025106c0 ffff20000c8d9e00 00000000ffffffff
[  743.356517] 7160: ffff800341c87400 ffff2000084ef36c ffff8003ffdf4680 00000000025106c0
[  743.364337] 7180: 00000000002156c0 00000000ffffffff 00000000024146c0 0000000000000003
[  743.372156] 71a0: 0000000000030020 ffff20000c8d9000 0000000000400000 0000000000000004
[  743.379976] 71c0: ffff800341c87290 ffff200008093624 ffff800341c87350 ffff800341c87310
[  743.387796] 71e0: ffff200008092ce0 ffff800341c4af80 ffff80036c0e0f80 ffff200009892b70
[  743.395615] 7200: ffff20000ab19b70 ffff80036c0e0f80 ffff800341c84000 0000000000000004
[  743.403435] 7220: 0000000041c4b738 1ffff000683896e7 0000000041b58ab3 ffff200000000040
[  743.411254] 7240: ffff200000000000 ffff20000c8d9e08 ffff04000191b3c1 0000000000000000
[  743.419074] 7260: 0000000000000000 ffff800341c87310 0000000300000000 ffff2000084ef36c
[  743.426894] 7280: 0000000041b58ab3 ffff20000a277828 ffff2000083e70b8 ffff2000080937ac
[  743.434713] 72a0: ffff800341c873f8 1ffff00068390e5e ffff800341c4af80 ffff800341c84000
[  743.442533] 72c0: ffff800341c87390 ffff20000809397c ffff800341c84000 ffff800341c873f8
[  743.450352] 72e0: 00000000025004c0 ffff800357ff2ac0 0000000041b58ab3 ffff20000a2623e8
[  743.458172] 7300: ffff200008093648 ffff800341c84000 ffff800341c873b0 ffff2000084fade8
[  743.465991] 7320: ffff800357ff2ce0 ffff800357ff2ba0 00000000025004c0 ffff800357ff2ac0
[  743.473811] 7340: ffff80036c0e0f80 ffff200009892b70 ffff800341c873b0 ffff200008b58184
[  743.481631] 7360: ffff20000a499000 000000000000b393 0000000000000000 00000000ffffffff
[  743.489450] 7380: 00000000024106c0 ffff200009892b94 0000000000030020 ffff20000ab18cf0
[  743.497270] 73a0: ffff20000c8d9e00 0000000000000000 ffff20000c8d9e00 0000000100000000
[  743.505089] 73c0: 0000000000000000 ffff200008235e10 ffff8003ffdf4680 00000000025106c0
[  743.512909] 73e0: 0000000000000000 ffff8003ffefd9b0 ffff800341c87400 ffff2000084ef38c
[  743.520729] 7400: ffff800341c87490 ffff2000084f3bc0 0000000000000000 ffff8003ffefc5d0
[  743.528548] 7420: 0000000000000000 ffff8003ffdf4680 00000000025106c0 ffff200009892b94
[  743.536368] 7440: 0000000000210d00 ffff20000ab18cf0 ffff20000ab19938 0000000000000004
[  743.544188] 7460: ffff2000098678a0 ffff20000854d770 ffff20000854ff38 025106c008553e20
[  743.552007] 7480: ffff200008084730 ffffffffffffffff ffff800341c87590 ffff2000084f4130
[  743.559827] 74a0: ffff20000a4a35d0 ffff20000a4d5e80 0000000000000140 00000000025106c0
[  743.567646] 74c0: ffff200009892b94 0000000000000004 ffff8003ffdf4680 ffff20000ab1cb30
[  743.575466] 74e0: ffff800341c84000 0000000000000004 ffff20000a499000 000000000000b392
[  743.583286] 7500: ffff20000ab19988 ffff8003ffefc5d0 ffff200009892b94 ffff20000a4d5000
[  743.591105] 7520: ffff800341c87580 ffff200008b5815c ffff20000a4a35d0 ffff8003ffdf4680
[  743.598925] 7540: 0000000000000140 00000000025106c0 ffff200009892b94 ffff20000a4d5000
[  743.606744] 7560: ffff8003ffdf4680 ffff20000ab1cb30 ffff800341c84000 ffff20000a278cb8
[  743.614564] 7580: ffff800341c87590 ffff2000084f40ec ffff800341c875e0 ffff2000084fa028
[  743.622383] 75a0: 0000000000000000 ffff8003ffdf4680 ffff8003ffdf4680 ffff20000ab1bff0
[  743.630203] 75c0: 00000000025106c0 ffff20000a4d5000 ffff200009892b94 ffff20000a4d5000
[  743.638023] 75e0: ffff800341c87660 ffff20000988cf54 ffff800341c87710 1ffff00068390ede
[  743.645842] 7600: 00000000025004c0 ffff200009892b94 0000000000000000 0000000000000200
[  743.653662] 7620: ffff80034219e940 dfff200000000000 ffff80034219e940 0000000000000000
[  743.661481] 7640: 0000000000000064 00000000025004c0 0000000000000000 ffff80036c0e0f80
[  743.669301] 7660: ffff800341c876a0 ffff200009892b94 ffff800357ff2ac0 1ffff00068390ede
[  743.677120] 7680: 0000000000000064 00000000025004c0 0000000000000000 ffff80036c0e0f80
[  743.684939] 76a0: ffff800341c87790 ffff200009893074 0000000000000000 0000000000000064
[  743.692759] 76c0: ffff80034219eb20 0000000000000000 0000000000000003 0000000000000000
[  743.700579] 76e0: ffff80034219e940 dfff200000000000 0000000041b58ab3 ffff20000a2cd5a8
[  743.708398] 7700: ffff200009892ad0 dfff200000000000 ffff80034219f200 ffff20000cb359b0
[  743.716218] 7720: ffff800342143364 ffff20000a4d5e90 ffff20000a4d5e90 00006003f5a2d000
[  743.724038] 7740: 1ffff0006842866c 0000000000000004 0000dffff5b2a188 ffff20000a4a0000
[  743.731857] 7760: ffff800341c877c0 ffff20000823daac ffff800341c84000 0000000000000140
[  743.739677] 7780: ffff20000a7ac240 000000000000010a ffff800341c87830 ffff20000986ec00
[  743.747498] 77a0: ffff800341c87920 7fffffffffffffff ffff80034219eb20 0000000000000000
[  743.755319] 77c0: 0000000000000002 1ffff00068433d65 ffff80034219e940 dfff200000000000
[  743.763138] 77e0: ffff80034219e940 0000000000000064 ffff800341c87830 ffff2000081b3178
[  743.770958] 7800: ffff800341c4af80 ffff20000a0f3aa0 000000000000010a 0000000000000000
[  743.778778] 7820: ffff8003025000c0 ffff800347135840 ffff800341c87980 ffff200009b33a10
[  743.786597] 7840: 0000000000000064 0000000000000000 0000000000000000 0000000000000000
[  743.794416] 7860: ffff800342198900 0000000000000064 ffff80034219e940 dfff200000000000
[  743.802236] 7880: 0000000000000000 0000000000000064 ffff20000a0f3140 1ffff00068390f4a
[  743.810055] 78a0: 0000000341c87ba0 0000000000000000 0000000000000064 ffff80034219ec50
[  743.817875] 78c0: 1ffff00068390f20 ffff800341c87a70 ffff200009b3c398 0000000000000064
[  743.825695] 78e0: ffff80034219eb28 ffff80034219ece2 1ffff00068433d8a ffff100068433d9c
[  743.833514] 7900: 0000000041b58ab3 ffff20000a2680e0 ffff20000986e710 ffff800341c4b740
[  743.841334] 7920: 1ffff000683896e8 000000000c8db000 ffff20000987442c 0000000000000140
[  743.849153] 7940: ffff800341c87980 ffff200009b33b70 ffff800341c87980 ffff200009b337d8
[  743.856973] 7960: ffff800347135840 ffff800341c87ba0 ffff20000a0f3140 0000000000000000
[  743.864793] 7980: ffff800341c87af0 ffff2000098675f8 ffff800347135840 ffff800341c87ba0
[  743.872612] 79a0: ffff20000a0f3140 ffff800341c87d77 ffff800341c87ba0 ffff800342b2a340
[  743.880432] 79c0: ffff800347135840 1ffff00068390faa 0000000000000002 1ffff0006856546c
[  743.888251] 79e0: ffff8003372a4780 ffff8003372a4790 1ffff00068390f4a ffff800347135840
[  743.896071] 7a00: ffff10006843312c ffff800342198960 ffff800341c87a70 ffff80034219eb28
[  743.903890] 7a20: ffff800341c87ab0 ffff800341c87be8 ffff800341c87ba0 1ffff00068390f7d
[  743.911710] 7a40: 0000000000000064 0000000000000064 0000000041b58ab3 ffff20000a2d20f8
[  743.919530] 7a60: ffff200009b33720 ffff20000a743000 00000000ffffff97 1ffff00068390f7e
[  743.927349] 7a80: ffff800341c4af80 0000000000000000 ffff800341c4af80 ffff8003ffef9000
[  743.935169] 7aa0: ffff800341c87ab0 ffff2000082383dc 0000000000000000 0000000000000000
[  743.942988] 7ac0: ffffffff00000000 00000000ffffffff ffff8003ffef9018 0000000000000000
[  743.950808] 7ae0: 0000000000000000 ffff2000081b205c ffff800341c87b30 ffff2000098678a0
[  743.958628] 7b00: ffff800341c87d50 ffff800341c87cf0 1ffff00068390f70 00000000000001c0
[  743.966447] 7b20: ffff8003ffef9018 ffff8003ffef9000 ffff800341c87c20 ffff20000854d770
[  743.974267] 7b40: 1ffff00068390f92 ffff20000a0c0980 ffff800341c87d50 ffff800341c87e80
[  743.982086] 7b60: 1ffff0006856546d ffff800342b2a368 1ffff00068390fd0 ffff80036ba1a480
[  743.989906] 7b80: 0000000041b58ab3 ffff20000a2ccf48 ffff2000098676e0 ffff20000caf9470
[  743.997725] 7ba0: 0000000000000000 0000000000000000 0000000000000001 0000000000000000
[  744.005545] 7bc0: 0000000000000064 ffff800341c87cb0 0000000000000001 0000000000000000
[  744.013364] 7be0: 0000000000000000 0000000000000000 ffff800341c87cf0 0000000000000001
[  744.021183] 7c00: ffff800341c4b76a ffff800341c4b748 ffff20000d540000 0000000000000001
[  744.029003] 7c20: ffff800341c87db0 ffff20000854ff38 ffff800342b2a340 0000000000000064
[  744.036822] 7c40: ffff800347135870 ffff800342b2a3b4 0000000000000004 1ffff00068565476
[  744.044642] 7c60: 0000ffffe63a1420 ffff800342b2a360 ffff800341c87e80 ffff800347135df0
[  744.052462] 7c80: 0000000000000064 ffff800342b29fd0 0000000041b58ab3 ffff20000a27c658
[  744.060281] 7ca0: ffff20000854d520 ffff800342b29fe0 0000ffffe63a1420 0000000000000064
[  744.068101] 7cc0: 0000dffff5b2a188 0000000000000001 1ffff0007ffdf327 0000000000000001
[  744.075920] 7ce0: ffff800341c87cf0 1ffff00068390fa2 ffff800342b2a340 0000000000000000
[  744.083739] 7d00: 0000000000000000 0000000000000000 0000000000000000 ffff20000a27dc50
[  744.091559] 7d20: ffff800341c87d60 ffff20000854f80c ffff800342b2a340 ffff800347135870
[  744.099378] 7d40: 0000000000000000 0000000000000001 0000000000000001 0000000000000000
[  744.107197] 7d60: 0000000000000064 ffff800341c87cb0 0000000000000001 0000000000000064
[  744.115016] 7d80: ffff800341c84000 ffff800342b2a3b4 0000000000000004 ffff800341c4b300
[  744.122836] 7da0: 0000000000000000 ffff8003372a4700 ffff800341c87e10 ffff200008553e20
[  744.130656] 7dc0: 1ffff00068390fcc ffff800342b2a340 ffff800342b2a340 dfff200000000000
[  744.138475] 7de0: 1ffff00068565487 0000ffffe63a1420 0000000000000064 ffff800342b2a438
[  744.146295] 7e00: ffff200009c47000 ffff800341c84000 0000000000000000 ffff200008084730
[  744.154114] 7e20: 0000000000000000 000000003d5e7b00 ffffffffffffffff 0000000000405acc
[  744.161934] 7e40: 0000000060000000 0000000000000015 0000000000000120 0000000000000040
[  744.169753] 7e60: 0000000041b58ab3 ffff20000a27c6d0 ffff200008553d78 000000003d5e7b00
[  744.177572] 7e80: 0000000000000000 0000000000405acc 0000000060000000 ffff200008084630
[  744.185392] 7ea0: 0000000000000000 ffff200008084624 0000000000000000 000000003d5e7b00
[  744.193212] 7ec0: 000000000000000c 0000ffffe63a1420 0000000000000064 0000ffffe63a1420
[  744.201031] 7ee0: 0000000000000000 00000000004a2790 000000000049d020 0000000000000058
[  744.208850] 7f00: 0000000000000040 1999999999999999 0000000000000000 0000000000000000
[  744.216669] 7f20: 0000000000000002 ffffffffffffffff 0000000000000000 00000000004a26f8
[  744.224488] 7f40: 0000000000000000 0000000000000001 0000000000000000 0000000000000000
[  744.232307] 7f60: 000000003d5e7b00 0000000000000010 0000000000000064 0000000000000004
[  744.240126] 7f80: 00000000000000f6 000000000049b000 000000000049c010 0000000000401e40
[  744.247946] 7fa0: 0000000000000022 0000ffffe63a13d0 0000000000401dd4 0000ffffe63a13d0
[  744.255765] 7fc0: 0000000000405acc 0000000060000000 000000000000000c 0000000000000040
[  744.263584] 7fe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  744.271402] Call trace:
[  744.273840] Exception stack(0xffff800341c86a90 to 0xffff800341c86bc0)
[  744.280270] 6a80:                                   ffff7e000ffb8000 0001000000000000
[  744.288090] 6aa0: ffff800341c86ce0 ffff2000083dfeb8 00000000200001c5 000000000000003d
[  744.295909] 6ac0: 0000000000000000 0000000000000100 ffff7e000ffbffc0 ffff800341c84000
[  744.303729] 6ae0: ffff800341c4b76a ffff800341c4b748 0000000041b58ab3 ffff20000a261068
[  744.311549] 6b00: ffff200008081b10 ffff800341c4af80 ffff800341c4b720 dfff200000000000
[  744.319368] 6b20: ffff20000b311000 0000000000000001 ffff20000b311a60 00000000000080e7
[  744.327188] 6b40: ffff800341c86ca0 ffff200009c16a78 ffff800341c86c10 ffff200009c28720
[  744.335007] 6b60: ffff800341c86bc0 ffff200008b58184 ffff20000a499000 000000000000b2f1
[  744.342826] 6b80: 0000000000000000 ffff20000a4d5000 ffff800336325e80 0000000000000000
[  744.350645] 6ba0: 0000dffff5b2a188 0000000000000001 0000000000000000 0000000000000000
[  744.358467] [<ffff2000083dfeb8>] move_freepages+0x220/0x338
[  744.364030] [<ffff2000083e0134>] move_freepages_block+0x164/0x1e0
[  744.370113] [<ffff2000083e11bc>] __rmqueue+0xac4/0x16d0
[  744.375329] [<ffff2000083e41fc>] get_page_from_freelist+0xa34/0x2228
[  744.381674] [<ffff2000083e74d4>] __alloc_pages_nodemask+0x41c/0x1f60
[  744.388019] [<ffff2000084ef36c>] new_slab+0x3e4/0x9d8
[  744.393061] [<ffff2000084f3bc0>] ___slab_alloc.constprop.18+0x3b8/0x8a8
[  744.399665] [<ffff2000084f4130>] __slab_alloc.isra.15.constprop.17+0x80/0x128
[  744.406790] [<ffff2000084fa028>] __kmalloc_track_caller+0x318/0x4e0
[  744.413050] [<ffff20000988cf54>] __kmalloc_reserve.isra.3+0x3c/0xc0
[  744.419307] [<ffff200009892b94>] __alloc_skb+0xc4/0x508
[  744.424522] [<ffff200009893074>] alloc_skb_with_frags+0x9c/0x650
[  744.430519] [<ffff20000986ec00>] sock_alloc_send_pskb+0x4f0/0x7d8
[  744.436605] [<ffff200009b33a10>] unix_stream_sendmsg+0x2f0/0x858
[  744.442603] [<ffff2000098675f8>] sock_sendmsg+0x88/0x138
[  744.447906] [<ffff2000098678a0>] sock_write_iter+0x1c0/0x308
[  744.453556] [<ffff20000854d770>] __vfs_write+0x250/0x4c8
[  744.458858] [<ffff20000854ff38>] vfs_write+0x128/0x520
[  744.463986] [<ffff200008553e20>] SyS_write+0xa8/0x140
[  744.469029] [<ffff200008084730>] el0_svc_naked+0x24/0x28
[  744.474333] Code: 913d0000 941ebb67 17ffffed d503201f (d4210000)
[  744.480482] ---[ end trace a906e1a5ea5e05bb ]---
[  744.485103] BUG: sleeping function called from invalid context at ./include/linux/sched.h:3049
[  744.493712] in_atomic(): 1, irqs_disabled(): 0, pid: 3608, name: hackbench
[  744.500583] INFO: lockdep is turned off.
[  744.504503] Preemption disabled at:[<ffff2000083e41c8>] get_page_from_freelist+0xa00/0x2228
[  744.512856]
[  744.514341] CPU: 4 PID: 3608 Comm: hackbench Tainted: G      D         4.8.0-rc7 #1
[  744.521986] Hardware name: AMD Seattle (Rev.B0) Development Board (Overdrive) (DT)
[  744.529544] Call trace:
[  744.531983] [<ffff200008093db8>] dump_backtrace+0x0/0x4d8
[  744.537373] [<ffff2000080942a4>] show_stack+0x14/0x20
[  744.542417] [<ffff200008afa714>] dump_stack+0xfc/0x150
[  744.547550] [<ffff2000081b2e24>] ___might_sleep+0x5ec/0x868
[  744.553114] [<ffff2000081b3178>] __might_sleep+0xd8/0x350
[  744.558504] [<ffff20000816b740>] exit_signals+0x80/0x428
[  744.563807] [<ffff200008143f18>] do_exit+0x220/0x1828
[  744.568849] [<ffff2000080945a4>] die+0x2f4/0x3c8
[  744.573458] [<ffff2000080946dc>] bug_handler.part.1+0x64/0xf0
[  744.579194] [<ffff2000080947ac>] bug_handler+0x44/0x70
[  744.584322] [<ffff200008086c28>] brk_handler+0x168/0x348
[  744.589624] [<ffff200008081c00>] do_debug_exception+0xf0/0x368
[  744.595446] Exception stack(0xffff800341c86a90 to 0xffff800341c86bc0)
[  744.601877] 6a80:                                   ffff7e000ffb8000 0001000000000000
[  744.609697] 6aa0: ffff800341c86ce0 ffff2000083dfeb8 00000000200001c5 000000000000003d
[  744.617516] 6ac0: 0000000000000000 0000000000000100 ffff7e000ffbffc0 ffff800341c84000
[  744.625336] 6ae0: ffff800341c4b76a ffff800341c4b748 0000000041b58ab3 ffff20000a261068
[  744.633155] 6b00: ffff200008081b10 ffff800341c4af80 ffff800341c4b720 dfff200000000000
[  744.640975] 6b20: ffff20000b311000 0000000000000001 ffff20000b311a60 00000000000080e7
[  744.648795] 6b40: ffff800341c86ca0 ffff200009c16a78 ffff800341c86c10 ffff200009c28720
[  744.656614] 6b60: ffff800341c86bc0 ffff200008b58184 ffff20000a499000 000000000000b2f1
[  744.664434] 6b80: 0000000000000000 ffff20000a4d5000 ffff800336325e80 0000000000000000
[  744.672253] 6ba0: 0000dffff5b2a188 0000000000000001 0000000000000000 0000000000000000
[  744.680072] [<ffff200008083e5c>] el1_dbg+0x18/0x74
[  744.684854] [<ffff2000083e0134>] move_freepages_block+0x164/0x1e0
[  744.690937] [<ffff2000083e11bc>] __rmqueue+0xac4/0x16d0
[  744.696153] [<ffff2000083e41fc>] get_page_from_freelist+0xa34/0x2228
[  744.702497] [<ffff2000083e74d4>] __alloc_pages_nodemask+0x41c/0x1f60
[  744.708841] [<ffff2000084ef36c>] new_slab+0x3e4/0x9d8
[  744.713882] [<ffff2000084f3bc0>] ___slab_alloc.constprop.18+0x3b8/0x8a8
[  744.720487] [<ffff2000084f4130>] __slab_alloc.isra.15.constprop.17+0x80/0x128
[  744.727612] [<ffff2000084fa028>] __kmalloc_track_caller+0x318/0x4e0
[  744.733870] [<ffff20000988cf54>] __kmalloc_reserve.isra.3+0x3c/0xc0
[  744.740127] [<ffff200009892b94>] __alloc_skb+0xc4/0x508
[  744.745343] [<ffff200009893074>] alloc_skb_with_frags+0x9c/0x650
[  744.751339] [<ffff20000986ec00>] sock_alloc_send_pskb+0x4f0/0x7d8
[  744.757423] [<ffff200009b33a10>] unix_stream_sendmsg+0x2f0/0x858
[  744.763421] [<ffff2000098675f8>] sock_sendmsg+0x88/0x138
[  744.768723] [<ffff2000098678a0>] sock_write_iter+0x1c0/0x308
[  744.774372] [<ffff20000854d770>] __vfs_write+0x250/0x4c8
[  744.779674] [<ffff20000854ff38>] vfs_write+0x128/0x520
[  744.784802] [<ffff200008553e20>] SyS_write+0xa8/0x140
[  744.789843] [<ffff200008084730>] el0_svc_naked+0x24/0x28
[  744.795159] note: hackbench[3608] exited with preempt_count 1
[  783.865366] BUG: spinlock lockup suspected on CPU#5, hackbench/3727
[  783.871631]  lock: contig_page_data+0xc80/0x1900, .magic: dead4ead, .owner: hackbench/3608, .owner_cpu: 4
[  783.881189] CPU: 5 PID: 3727 Comm: hackbench Tainted: G      D         4.8.0-rc7 #1
[  783.888835] Hardware name: AMD Seattle (Rev.B0) Development Board (Overdrive) (DT)
[  783.896393] Call trace:
[  783.898832] [<ffff200008093db8>] dump_backtrace+0x0/0x4d8
[  783.904222] [<ffff2000080942a4>] show_stack+0x14/0x20
[  783.909265] [<ffff200008afa714>] dump_stack+0xfc/0x150
[  783.914395] [<ffff20000824a16c>] spin_dump+0x19c/0x2f0
[  783.919524] [<ffff20000824a770>] do_raw_spin_lock+0x2d8/0x3e8
[  783.925262] [<ffff200009c28074>] _raw_spin_lock_irqsave+0x54/0x68
[  783.931346] [<ffff2000083e41c8>] get_page_from_freelist+0xa00/0x2228
[  783.937691] [<ffff2000083e74d4>] __alloc_pages_nodemask+0x41c/0x1f60
[  783.944034] [<ffff2000084ef36c>] new_slab+0x3e4/0x9d8
[  783.949076] [<ffff2000084f3bc0>] ___slab_alloc.constprop.18+0x3b8/0x8a8
[  783.955680] [<ffff2000084f4130>] __slab_alloc.isra.15.constprop.17+0x80/0x128
[  783.962805] [<ffff2000084fa028>] __kmalloc_track_caller+0x318/0x4e0
[  783.969063] [<ffff20000988cf54>] __kmalloc_reserve.isra.3+0x3c/0xc0
[  783.975320] [<ffff200009892b94>] __alloc_skb+0xc4/0x508
[  783.980536] [<ffff200009893074>] alloc_skb_with_frags+0x9c/0x650
[  783.986532] [<ffff20000986ec00>] sock_alloc_send_pskb+0x4f0/0x7d8
[  783.992616] [<ffff200009b33a10>] unix_stream_sendmsg+0x2f0/0x858
[  783.998614] [<ffff2000098675f8>] sock_sendmsg+0x88/0x138
[  784.003916] [<ffff2000098678a0>] sock_write_iter+0x1c0/0x308
[  784.009565] [<ffff20000854d770>] __vfs_write+0x250/0x4c8
[  784.014867] [<ffff20000854ff38>] vfs_write+0x128/0x520
[  784.019995] [<ffff200008553e20>] SyS_write+0xa8/0x140
[  784.025037] [<ffff200008084730>] el0_svc_naked+0x24/0x28
[  802.492828] BUG: spinlock lockup suspected on CPU#7, hackbench/3194
[  802.499097]  lock: contig_page_data+0xc80/0x1900, .magic: dead4ead, .owner: hackbench/3608, .owner_cpu: 4
[  802.508655] CPU: 7 PID: 3194 Comm: hackbench Tainted: G      D         4.8.0-rc7 #1
[  802.516301] Hardware name: AMD Seattle (Rev.B0) Development Board (Overdrive) (DT)
[  802.523859] Call trace:
[  802.526300] [<ffff200008093db8>] dump_backtrace+0x0/0x4d8
[  802.531690] [<ffff2000080942a4>] show_stack+0x14/0x20
[  802.536733] [<ffff200008afa714>] dump_stack+0xfc/0x150
[  802.541862] [<ffff20000824a16c>] spin_dump+0x19c/0x2f0
[  802.546991] [<ffff20000824a770>] do_raw_spin_lock+0x2d8/0x3e8
[  802.552729] [<ffff200009c28074>] _raw_spin_lock_irqsave+0x54/0x68
[  802.558813] [<ffff2000083e41c8>] get_page_from_freelist+0xa00/0x2228
[  802.565158] [<ffff2000083e74d4>] __alloc_pages_nodemask+0x41c/0x1f60
[  802.571502] [<ffff2000084ef36c>] new_slab+0x3e4/0x9d8
[  802.576544] [<ffff2000084f3bc0>] ___slab_alloc.constprop.18+0x3b8/0x8a8
[  802.583148] [<ffff2000084f4130>] __slab_alloc.isra.15.constprop.17+0x80/0x128
[  802.590273] [<ffff2000084fa028>] __kmalloc_track_caller+0x318/0x4e0
[  802.596531] [<ffff20000988cf54>] __kmalloc_reserve.isra.3+0x3c/0xc0
[  802.602789] [<ffff200009892b94>] __alloc_skb+0xc4/0x508
[  802.608004] [<ffff200009893074>] alloc_skb_with_frags+0x9c/0x650
[  802.614001] [<ffff20000986ec00>] sock_alloc_send_pskb+0x4f0/0x7d8
[  802.620086] [<ffff200009b33a10>] unix_stream_sendmsg+0x2f0/0x858
[  802.626083] [<ffff2000098675f8>] sock_sendmsg+0x88/0x138
[  802.631386] [<ffff2000098678a0>] sock_write_iter+0x1c0/0x308
[  802.637035] [<ffff20000854d770>] __vfs_write+0x250/0x4c8
[  802.642337] [<ffff20000854ff38>] vfs_write+0x128/0x520
[  802.647465] [<ffff200008553e20>] SyS_write+0xa8/0x140
[  802.652507] [<ffff200008084730>] el0_svc_naked+0x24/0x28
[  802.727119] BUG: spinlock lockup suspected on CPU#1, hackbench/5203
[  802.733384]  lock: contig_page_data+0xc80/0x1900, .magic: dead4ead, .owner: hackbench/3608, .owner_cpu: 4
[  802.742942] CPU: 1 PID: 5203 Comm: hackbench Tainted: G      D         4.8.0-rc7 #1
[  802.750587] Hardware name: AMD Seattle (Rev.B0) Development Board (Overdrive) (DT)
[  802.758145] Call trace:
[  802.760584] [<ffff200008093db8>] dump_backtrace+0x0/0x4d8
[  802.765975] [<ffff2000080942a4>] show_stack+0x14/0x20
[  802.771017] [<ffff200008afa714>] dump_stack+0xfc/0x150
[  802.776146] [<ffff20000824a16c>] spin_dump+0x19c/0x2f0
[  802.781275] [<ffff20000824a770>] do_raw_spin_lock+0x2d8/0x3e8
[  802.787013] [<ffff200009c28074>] _raw_spin_lock_irqsave+0x54/0x68
[  802.793097] [<ffff2000083e41c8>] get_page_from_freelist+0xa00/0x2228
[  802.799441] [<ffff2000083e74d4>] __alloc_pages_nodemask+0x41c/0x1f60
[  802.805785] [<ffff2000084ef36c>] new_slab+0x3e4/0x9d8
[  802.810827] [<ffff2000084f3bc0>] ___slab_alloc.constprop.18+0x3b8/0x8a8
[  802.817432] [<ffff2000084f4130>] __slab_alloc.isra.15.constprop.17+0x80/0x128
[  802.824557] [<ffff2000084fa028>] __kmalloc_track_caller+0x318/0x4e0
[  802.830815] [<ffff20000988cf54>] __kmalloc_reserve.isra.3+0x3c/0xc0
[  802.837073] [<ffff200009892b94>] __alloc_skb+0xc4/0x508
[  802.842289] [<ffff200009893074>] alloc_skb_with_frags+0x9c/0x650
[  802.848285] [<ffff20000986ec00>] sock_alloc_send_pskb+0x4f0/0x7d8
[  802.854370] [<ffff200009b33a10>] unix_stream_sendmsg+0x2f0/0x858
[  802.860367] [<ffff2000098675f8>] sock_sendmsg+0x88/0x138
[  802.865670] [<ffff2000098678a0>] sock_write_iter+0x1c0/0x308
[  802.871319] [<ffff20000854d770>] __vfs_write+0x250/0x4c8
[  802.876621] [<ffff20000854ff38>] vfs_write+0x128/0x520
[  802.881750] [<ffff200008553e20>] SyS_write+0xa8/0x140
[  802.886792] [<ffff200008084730>] el0_svc_naked+0x24/0x28
[  806.778113] BUG: spinlock lockup suspected on CPU#6, hackbench/3240
[  806.784376]  lock: contig_page_data+0xc80/0x1900, .magic: dead4ead, .owner: hackbench/3608, .owner_cpu: 4
[  806.793933] CPU: 6 PID: 3240 Comm: hackbench Tainted: G      D         4.8.0-rc7 #1
[  806.801578] Hardware name: AMD Seattle (Rev.B0) Development Board (Overdrive) (DT)
[  806.809136] Call trace:
[  806.811575] [<ffff200008093db8>] dump_backtrace+0x0/0x4d8
[  806.816966] [<ffff2000080942a4>] show_stack+0x14/0x20
[  806.822008] [<ffff200008afa714>] dump_stack+0xfc/0x150
[  806.827137] [<ffff20000824a16c>] spin_dump+0x19c/0x2f0
[  806.832265] [<ffff20000824a770>] do_raw_spin_lock+0x2d8/0x3e8
[  806.838002] [<ffff200009c28074>] _raw_spin_lock_irqsave+0x54/0x68
[  806.844086] [<ffff2000083e41c8>] get_page_from_freelist+0xa00/0x2228
[  806.850430] [<ffff2000083e74d4>] __alloc_pages_nodemask+0x41c/0x1f60
[  806.856774] [<ffff2000084ef36c>] new_slab+0x3e4/0x9d8
[  806.861815] [<ffff2000084f3bc0>] ___slab_alloc.constprop.18+0x3b8/0x8a8
[  806.868420] [<ffff2000084f4130>] __slab_alloc.isra.15.constprop.17+0x80/0x128
[  806.875545] [<ffff2000084fa028>] __kmalloc_track_caller+0x318/0x4e0
[  806.881803] [<ffff20000988cf54>] __kmalloc_reserve.isra.3+0x3c/0xc0
[  806.888060] [<ffff200009892b94>] __alloc_skb+0xc4/0x508
[  806.893276] [<ffff200009893074>] alloc_skb_with_frags+0x9c/0x650
[  806.899272] [<ffff20000986ec00>] sock_alloc_send_pskb+0x4f0/0x7d8
[  806.905356] [<ffff200009b33a10>] unix_stream_sendmsg+0x2f0/0x858
[  806.911354] [<ffff2000098675f8>] sock_sendmsg+0x88/0x138
[  806.916656] [<ffff2000098678a0>] sock_write_iter+0x1c0/0x308
[  806.922306] [<ffff20000854d770>] __vfs_write+0x250/0x4c8
[  806.927607] [<ffff20000854ff38>] vfs_write+0x128/0x520
[  806.932736] [<ffff200008553e20>] SyS_write+0xa8/0x140
[  806.937777] [<ffff200008084730>] el0_svc_naked+0x24/0x28
[  808.159084] BUG: spinlock lockup suspected on CPU#3, hackbench/4717
[  808.165350]  lock: contig_page_data+0xc80/0x1900, .magic: dead4ead, .owner: hackbench/3608, .owner_cpu: 4
[  808.174908] CPU: 3 PID: 4717 Comm: hackbench Tainted: G      D         4.8.0-rc7 #1
[  808.182554] Hardware name: AMD Seattle (Rev.B0) Development Board (Overdrive) (DT)
[  808.190112] Call trace:
[  808.192552] [<ffff200008093db8>] dump_backtrace+0x0/0x4d8
[  808.197942] [<ffff2000080942a4>] show_stack+0x14/0x20
[  808.202985] [<ffff200008afa714>] dump_stack+0xfc/0x150
[  808.208114] [<ffff20000824a16c>] spin_dump+0x19c/0x2f0
[  808.213243] [<ffff20000824a770>] do_raw_spin_lock+0x2d8/0x3e8
[  808.218980] [<ffff200009c28074>] _raw_spin_lock_irqsave+0x54/0x68
[  808.225064] [<ffff2000083e41c8>] get_page_from_freelist+0xa00/0x2228
[  808.231408] [<ffff2000083e74d4>] __alloc_pages_nodemask+0x41c/0x1f60
[  808.237752] [<ffff2000084ef36c>] new_slab+0x3e4/0x9d8
[  808.242794] [<ffff2000084f3bc0>] ___slab_alloc.constprop.18+0x3b8/0x8a8
[  808.249399] [<ffff2000084f4130>] __slab_alloc.isra.15.constprop.17+0x80/0x128
[  808.256524] [<ffff2000084fa028>] __kmalloc_track_caller+0x318/0x4e0
[  808.262782] [<ffff20000988cf54>] __kmalloc_reserve.isra.3+0x3c/0xc0
[  808.269039] [<ffff200009892b94>] __alloc_skb+0xc4/0x508
[  808.274255] [<ffff200009893074>] alloc_skb_with_frags+0x9c/0x650
[  808.280251] [<ffff20000986ec00>] sock_alloc_send_pskb+0x4f0/0x7d8
[  808.286335] [<ffff200009b33a10>] unix_stream_sendmsg+0x2f0/0x858
[  808.292333] [<ffff2000098675f8>] sock_sendmsg+0x88/0x138
[  808.297635] [<ffff2000098678a0>] sock_write_iter+0x1c0/0x308
[  808.303285] [<ffff20000854d770>] __vfs_write+0x250/0x4c8
[  808.308587] [<ffff20000854ff38>] vfs_write+0x128/0x520
[  808.313715] [<ffff200008553e20>] SyS_write+0xa8/0x140
[  808.318757] [<ffff200008084730>] el0_svc_naked+0x24/0x28
[  809.327451] BUG: spinlock lockup suspected on CPU#2, hackbench/3360
[  809.333714]  lock: contig_page_data+0xc80/0x1900, .magic: dead4ead, .owner: hackbench/3608, .owner_cpu: 4
[  809.343271] CPU: 2 PID: 3360 Comm: hackbench Tainted: G      D         4.8.0-rc7 #1
[  809.350916] Hardware name: AMD Seattle (Rev.B0) Development Board (Overdrive) (DT)
[  809.358474] Call trace:
[  809.360913] [<ffff200008093db8>] dump_backtrace+0x0/0x4d8
[  809.366303] [<ffff2000080942a4>] show_stack+0x14/0x20
[  809.371345] [<ffff200008afa714>] dump_stack+0xfc/0x150
[  809.376475] [<ffff20000824a16c>] spin_dump+0x19c/0x2f0
[  809.381603] [<ffff20000824a770>] do_raw_spin_lock+0x2d8/0x3e8
[  809.382291] BUG: spinlock lockup suspected on CPU#0, hackbench/5685
[  809.382297]  lock: contig_page_data+0xc80/0x1900, .magic: dead4ead, .owner: hackbench/3608, .owner_cpu: 4
[  809.403145] [<ffff200009c28074>] _raw_spin_lock_irqsave+0x54/0x68
[  809.409229] [<ffff2000083e41c8>] get_page_from_freelist+0xa00/0x2228
[  809.415574] [<ffff2000083e74d4>] __alloc_pages_nodemask+0x41c/0x1f60
[  809.421917] [<ffff2000084ef36c>] new_slab+0x3e4/0x9d8
[  809.426959] [<ffff2000084f3bc0>] ___slab_alloc.constprop.18+0x3b8/0x8a8
[  809.433564] [<ffff2000084f4130>] __slab_alloc.isra.15.constprop.17+0x80/0x128
[  809.440689] [<ffff2000084fa028>] __kmalloc_track_caller+0x318/0x4e0
[  809.446946] [<ffff20000988cf54>] __kmalloc_reserve.isra.3+0x3c/0xc0
[  809.453204] [<ffff200009892b94>] __alloc_skb+0xc4/0x508
[  809.458420] [<ffff200009893074>] alloc_skb_with_frags+0x9c/0x650
[  809.464417] [<ffff20000986ec00>] sock_alloc_send_pskb+0x4f0/0x7d8
[  809.470501] [<ffff200009b33a10>] unix_stream_sendmsg+0x2f0/0x858
[  809.476498] [<ffff2000098675f8>] sock_sendmsg+0x88/0x138
[  809.481801] [<ffff2000098678a0>] sock_write_iter+0x1c0/0x308
[  809.487450] [<ffff20000854d770>] __vfs_write+0x250/0x4c8
[  809.492752] [<ffff20000854ff38>] vfs_write+0x128/0x520
[  809.497880] [<ffff200008553e20>] SyS_write+0xa8/0x140
[  809.502922] [<ffff200008084730>] el0_svc_naked+0x24/0x28
[  809.508226] CPU: 0 PID: 5685 Comm: hackbench Tainted: G      D         4.8.0-rc7 #1
[  809.515873] Hardware name: AMD Seattle (Rev.B0) Development Board (Overdrive) (DT)
[  809.523431] Call trace:
[  809.525871] [<ffff200008093db8>] dump_backtrace+0x0/0x4d8
[  809.531261] [<ffff2000080942a4>] show_stack+0x14/0x20
[  809.536304] [<ffff200008afa714>] dump_stack+0xfc/0x150
[  809.541433] [<ffff20000824a16c>] spin_dump+0x19c/0x2f0
[  809.546562] [<ffff20000824a770>] do_raw_spin_lock+0x2d8/0x3e8
[  809.552299] [<ffff200009c28074>] _raw_spin_lock_irqsave+0x54/0x68
[  809.558383] [<ffff2000083e41c8>] get_page_from_freelist+0xa00/0x2228
[  809.564728] [<ffff2000083e74d4>] __alloc_pages_nodemask+0x41c/0x1f60
[  809.571071] [<ffff2000084ef36c>] new_slab+0x3e4/0x9d8
[  809.576113] [<ffff2000084f3bc0>] ___slab_alloc.constprop.18+0x3b8/0x8a8
[  809.582717] [<ffff2000084f4130>] __slab_alloc.isra.15.constprop.17+0x80/0x128
[  809.589842] [<ffff2000084fa028>] __kmalloc_track_caller+0x318/0x4e0
[  809.596100] [<ffff20000988cf54>] __kmalloc_reserve.isra.3+0x3c/0xc0
[  809.602357] [<ffff200009892b94>] __alloc_skb+0xc4/0x508
[  809.607573] [<ffff200009893074>] alloc_skb_with_frags+0x9c/0x650
[  809.613570] [<ffff20000986ec00>] sock_alloc_send_pskb+0x4f0/0x7d8
[  809.619654] [<ffff200009b33a10>] unix_stream_sendmsg+0x2f0/0x858
[  809.625651] [<ffff2000098675f8>] sock_sendmsg+0x88/0x138
[  809.630953] [<ffff2000098678a0>] sock_write_iter+0x1c0/0x308
[  809.636602] [<ffff20000854d770>] __vfs_write+0x250/0x4c8
[  809.641904] [<ffff20000854ff38>] vfs_write+0x128/0x520
[  809.647032] [<ffff200008553e20>] SyS_write+0xa8/0x140
[  809.652074] [<ffff200008084730>] el0_svc_naked+0x24/0x28
[  810.224351] BUG: spinlock lockup suspected on CPU#4, hackbench/5272
[  810.230613]  lock: contig_page_data+0xc80/0x1900, .magic: dead4ead, .owner: hackbench/3608, .owner_cpu: 4
[  810.240169] CPU: 4 PID: 5272 Comm: hackbench Tainted: G      D         4.8.0-rc7 #1
[  810.247814] Hardware name: AMD Seattle (Rev.B0) Development Board (Overdrive) (DT)
[  810.255371] Call trace:
[  810.257810] [<ffff200008093db8>] dump_backtrace+0x0/0x4d8
[  810.263200] [<ffff2000080942a4>] show_stack+0x14/0x20
[  810.268242] [<ffff200008afa714>] dump_stack+0xfc/0x150
[  810.273371] [<ffff20000824a16c>] spin_dump+0x19c/0x2f0
[  810.278499] [<ffff20000824a770>] do_raw_spin_lock+0x2d8/0x3e8
[  810.284236] [<ffff200009c28074>] _raw_spin_lock_irqsave+0x54/0x68
[  810.290320] [<ffff2000083e41c8>] get_page_from_freelist+0xa00/0x2228
[  810.296664] [<ffff2000083e74d4>] __alloc_pages_nodemask+0x41c/0x1f60
[  810.303008] [<ffff2000084ef36c>] new_slab+0x3e4/0x9d8
[  810.308049] [<ffff2000084f3bc0>] ___slab_alloc.constprop.18+0x3b8/0x8a8
[  810.314654] [<ffff2000084f4130>] __slab_alloc.isra.15.constprop.17+0x80/0x128
[  810.321779] [<ffff2000084fa028>] __kmalloc_track_caller+0x318/0x4e0
[  810.328037] [<ffff20000988cf54>] __kmalloc_reserve.isra.3+0x3c/0xc0
[  810.334294] [<ffff200009892b94>] __alloc_skb+0xc4/0x508
[  810.339509] [<ffff200009893074>] alloc_skb_with_frags+0x9c/0x650
[  810.345506] [<ffff20000986ec00>] sock_alloc_send_pskb+0x4f0/0x7d8
[  810.351590] [<ffff200009b33a10>] unix_stream_sendmsg+0x2f0/0x858
[  810.357587] [<ffff2000098675f8>] sock_sendmsg+0x88/0x138
[  810.362889] [<ffff2000098678a0>] sock_write_iter+0x1c0/0x308
[  810.368538] [<ffff20000854d770>] __vfs_write+0x250/0x4c8
[  810.373840] [<ffff20000854ff38>] vfs_write+0x128/0x520
[  810.378968] [<ffff200008553e20>] SyS_write+0xa8/0x140
[  810.384010] [<ffff200008084730>] el0_svc_naked+0x24/0x28