L2 NULL reference with ptw

[    7.061381] usbcore: registered new device driver usb
[    7.145351] pps_core: LinuxPPS API ver. 1 registered
[    7.205665] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[    7.317650] PTP clock support registered
[    7.369665] dmi: Firmware registration failed.
[    7.485681] clocksource: Switched to clocksource arm,sp804
[   37.742672] random: nonblocking pool is initialized
[  137.770470] kvm [1561]: fault_ipa: fa400000
[  137.771260] kvm [1561]: pfn: 3a3600
[  250.497860] sched: RT throttling activated
[  290.546884] NET: Registered protocol family 2
[  295.662526] TCP established hash table entries: 32768 (order: 6, 262144 bytes)
[  301.002884] TCP bind hash table entries: 32768 (order: 7, 524288 bytes)
[  301.210428] TCP: Hash tables configured (established 32768 bind 32768)
[  301.282392] UDP hash table entries: 2048 (order: 4, 65536 bytes)
[  301.348974] UDP-Lite hash table entries: 2048 (order: 4, 65536 bytes)
[  301.418177] NET: Registered protocol family 1
[  313.510067] RPC: Registered named UNIX socket transport module.
[  316.310806] RPC: Registered udp transport module.
[  316.922784] RPC: Registered tcp transport module.
[  317.614800] RPC: Registered tcp NFSv4.1 backchannel transport module.
[  328.134815] kvm [1]: HYP mode not available
[  395.486103] nest-tests successfully initialized
[  399.518461] futex hash table entries: 256 (order: 3, 32768 bytes)
[  399.898887] audit: initializing netlink subsys (disabled)
[  406.110456] audit: type=2000 audit(401.568:1): initialized
[  414.474792] Unable to handle kernel NULL pointer dereference at virtual address 00000100
[  414.558646] pgd = ffff800000a27000
[  414.594464] [00000100] *pgd=000000013b005003, *pud=000000013b006003, *pmd=000000013b007003, *pte=0060000008000707
[  414.706801] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[  414.765564] Modules linked in:
[  414.800600] CPU: 0 PID: 4 Comm: kworker/0:0 Not tainted 4.4.0-rc5+ #4
[  414.868095] Hardware name: linux,dummy-virt (DT)
[  414.917592] Workqueue: events vmstat_shepherd
[  414.965635] task: ffff8000fb07a100 ti: ffff8000fb0a4000 task.ti: ffff8000fb0a4000
[  415.044575] PC is at __queue_work+0x2c/0x23c
[  415.089894] LR is at __queue_delayed_work+0x9c/0x110
[  415.142869] pc : [<ffff8000000c9954>] lr : [<ffff8000000c9cf8>] pstate: 600001c5
[  415.220269] sp : ffff8000fb0a7c90
[  415.256133] x29: ffff8000fb0a7c90 x28: ffff800000976d10
[  415.314870] x27: ffff800000a01fa8 x26: ffff80000095ac18
[  415.373140] x25: ffff800000976b80 x24: ffff800000a01fb0
[  415.432915] x23: 0000000000000000 x22: 0000000000000000
[  415.493749] x21: 0000000000000000 x20: ffff8000fffc9c18
[  415.554665] x19: 0000000000000140 x18: 000000000000000a
[  415.615440] x17: 00000000000006bf x16: ffffffffffffffff
[  415.675890] x15: 0000000000000000 x14: 0000000007a12000
[  415.736337] x13: 000000000000015d x12: 7fffffffffffffff
[  415.798201] x11: ffff8000006654c0 x10: 0000000000000740
[  415.859453] x9 : ffff8000fb0a7d30 x8 : ffff8000fb07a8a0
[  415.919043] x7 : ffff8000fffcbd90 x6 : ffff8000fffc9c20
[  415.979606] x5 : ffff8000fffc9c38 x4 : 0000000000000000
[  416.039078] x3 : 0000000000000000 x2 : ffff8000fffc9c18
[  416.099447] x1 : 0000000000000000 x0 : 00000000000001c0
[  416.160394]
[  416.177823] Process kworker/0:0 (pid: 4, stack limit = 0xffff8000fb0a4020)
[  416.249942] Stack: (0xffff8000fb0a7c90 to 0xffff8000fb0a8000)
[  416.310897] 7c80:                                   ffff8000fb0a7ce0 ffff8000000c9cf8
[  416.393070] 7ca0: 0000000000000140 0000000000000000 0000000000000000 0000000000000000
[  416.475886] 7cc0: 0000000000000000 ffff800000a01fb0 ffff800000976b80 ffff80000095ac18
[  416.558769] 7ce0: ffff8000fb0a7cf0 ffff8000000c9dbc ffff8000fb0a7d30 ffff80000015a62c
[  416.642348] 7d00: ffff8000009ea900 ffff800000976000 0000000000000000 ffff80000015a578
[  416.724840] 7d20: 0000000000000000 ffff8000fffc9c18 ffff8000fb0a7d90 ffff8000000ca4e4
[  416.808237] 7d40: ffff8000fb01a100 ffff80000098cc80 ffff8000fffcb500 ffff8000fffcf900
[  416.890433] 7d60: 0000000000000000 0000000000000000 0000000000000001 ffff8000fffcb570
[  416.973064] 7d80: ffff8000fffcb7a0 ffff8000fffcb518 ffff8000fb0a7dd0 ffff8000000ca7e4
[  417.056003] 7da0: ffff8000fb01a100 ffff8000fffcb518 ffff8000fffcb500 ffff8000fb01a130
[  417.137810] 7dc0: ffff8000fb0a4000 ffff8000009ed41b ffff8000fb0a7e30 ffff8000000cff48
[  417.220403] 7de0: ffff8000fb019980 ffff8000009f6068 ffff800000804850 ffff8000fb01a100
[  417.302917] 7e00: ffff8000000ca6b0 0000000000000000 0000000000000000 0000000000000000
[  417.385787] 7e20: 0000000000000000 0000000000000000 0000000000000000 ffff800000085c50
[  417.467662] 7e40: ffff8000000cfe68 ffff8000fb019980 0000000000000000 0000000000000000
[  417.550319] 7e60: 0000000000000000 ffff8000000d8338 ffff8000000cfe68 0000000000000000
[  417.633668] 7e80: 0000000000000000 ffff8000fb01a100 0000000000000000 0000000000000000
[  417.716043] 7ea0: ffff8000fb0a7ea0 ffff8000fb0a7ea0 0000000000000000 ffff800000000000
[  417.797895] 7ec0: ffff8000fb0a7ec0 ffff8000fb0a7ec0 0000000000000000 0000000000000000
[  417.880053] 7ee0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  417.962408] 7f00: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  418.045534] 7f20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  418.129223] 7f40: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  418.213503] 7f60: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  418.296234] 7f80: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  418.378263] 7fa0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  418.461652] 7fc0: 0000000000000000 0000000000000000 0000000000000000 0000000000000005
[  418.544991] 7fe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  418.628187] Call trace:
[  418.655690] [<ffff8000000c9954>] __queue_work+0x2c/0x23c
[  418.712061] [<ffff8000000c9cf8>] __queue_delayed_work+0x9c/0x110
[  418.776001] [<ffff8000000c9dbc>] queue_delayed_work_on+0x50/0x6c
[  418.840898] [<ffff80000015a62c>] vmstat_shepherd+0xe8/0x134
[  418.900768] [<ffff8000000ca4e4>] process_one_work+0x138/0x304
[  418.961945] [<ffff8000000ca7e4>] worker_thread+0x134/0x40c
[  419.021144] [<ffff8000000cff48>] kthread+0xe0/0xf4
[  419.075025] [<ffff800000085c50>] ret_from_fork+0x10/0x40
[  419.132206] Code: aa0103f6 aa0203f4 d53b4220 36380c40 (b94102c1)
[  427.514912] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[  429.614437] ---[ end trace cbabd133e1e2904c ]---
[  431.455582] Unable to handle kernel paging request at virtual address ffffffffffffffd8
[  431.536744] pgd = ffff800000a27000
[  431.572864] [ffffffffffffffd8] *pgd=0000000000000000
[  431.625845] Internal error: Oops: 96000004 [#2] PREEMPT SMP
[  431.683675] Modules linked in:
[  431.718149] CPU: 0 PID: 4 Comm: kworker/0:0 Tainted: G      D         4.4.0-rc5+ #4
[  431.798082] Hardware name: linux,dummy-virt (DT)
[  431.848153] task: ffff8000fb07a100 ti: ffff8000fb0a4000 task.ti: ffff8000fb0a4000
[  431.927823] PC is at kthread_data+0x4/0xc
[  431.971402] LR is at wq_worker_sleeping+0x10/0xc4
[  432.021660] pc : [<ffff8000000d04f4>] lr : [<ffff8000000cb280>] pstate: 600001c5
[  432.098710] sp : ffff8000fb0a78a0
[  432.135905] x29: ffff8000fb0a78a0 x28: ffff800000976d10
[  432.196824] x27: ffff8000fb07a100 x26: 0000000000000000
[  432.255315] x25: ffff80000064d04c x24: ffff80000095c000
[  432.313482] x23: ffff800000976000 x22: 0000000000000000
[  432.373398] x21: ffff8000fb07a100 x20: ffff8000fb07a558
[  432.432997] x19: ffff8000fffcbd00 x18: ffff8000006b5280
[  432.492958] x17: 000000000000000e x16: 0000000000000007
[  432.553203] x15: 0000000000000001 x14: 0000000000000007
[  432.612945] x13: 000000000000000e x12: 0000000000000013
[  432.673266] x11: 000000000000001a x10: 00000000a081edbe
[  432.741093] x9 : 0000000076dc4190 x8 : 000000000e6135ba
[  432.802698] x7 : 0000000002e78f38 x6 : 0000000000000000
[  432.865198] x5 : 0000000000001400 x4 : 0000000003e39e16
[  432.926527] x3 : 000000000000af3b x2 : ffff8000fb002380
[  432.987399] x1 : 0000000000000000 x0 : 0000000000000000
[  433.046792]
[  433.065926] Process kworker/0:0 (pid: 4, stack limit = 0xffff8000fb0a4020)
[  433.140100] Stack: (0xffff8000fb0a78a0 to 0xffff8000fb0a8000)
[  433.200891] 78a0: ffff8000fb0a78c0 ffff80000064cd14 0000000000000001 0000000000000000
[  433.283704] 78c0: ffff8000fb0a7910 ffff80000064d04c ffff8000fb0a4000 ffff8000fb07a448
[  433.365411] 78e0: ffff8000fb0a7990 0000000000000000 0000000000000001 ffff800000976000
[  433.446794] 7900: ffff800000976b80 ffff8000fb078000 ffff8000fb0a7930 ffff8000000b80a0
[  433.529391] 7920: ffff8000fb0a7610 ffff8000000b8060 ffff8000fb0a79a0 ffff800000089a24
[  433.610784] 7940: ffff8000009f2000 0000000000000000 ffff800000800490 ffff8000fb0a7b70
[  433.693143] 7960: ffff8000fb0a4000 ffff8000fb07a100 ffff800000976b80 ffff80000095ac18
[  433.775446] 7980: ffff800000a01fa8 ffff800000976d10 ffff8000fb0a7990 ffff8000fb0a7990
[  433.857712] 79a0: ffff8000fb0a79e0 ffff8000000958f8 0000000000000100 0000000096000004
[  433.939640] 79c0: 0000000000000000 ffff8000fb0a7b70 0000000000000100 0000000000000025
[  434.021120] 79e0: ffff8000fb0a7a10 ffff800000093f08 ffff8000fb0a7b70 ffff8000fb07a100
[  434.103071] 7a00: 0000000000000000 0000000096000004 ffff8000fb0a7a80 ffff80000009403c
[  434.184918] 7a20: 0000000000000100 ffff8000fb0a7b70 0000000096000004 ffff8000fb0a7b70
[  434.266794] 7a40: 00000000600001c5 0000000000000025 ffff800000976b80 ffff80000095ac18
[  434.349122] 7a60: ffff800000a01fa8 ffff800000976d10 ffff800000976000 ffff800000958a38
[  434.431816] 7a80: ffff8000fb0a7ac0 ffff8000000822a0 0000000096000004 ffff800000980290
[  434.513378] 7aa0: 0000000000000100 ffff8000fb0a7b70 00000000600001c5 0000000040000145
[  434.595277] 7ac0: ffff8000fb0a7c90 ffff800000085428 0000000000000140 ffff8000fffc9c18
[  434.676551] 7ae0: ffff8000fb0a7c90 ffff8000000c9954 0000000000000001 ffff8000fb0a7be0
[  434.758450] 7b00: ffff800000979000 ffff000000021000 ffff80000064d04c 0000000000000000
[  434.840740] 7b20: ffff8000fffcb7a0 ffff8000fffcb518 ffff8000fb0a7b50 ffff8000000b9164
[  434.922223] 7b40: ffff80000095a000 0000000a04208060 ffff8000fb0a7b60 ffff8000000f258c
[  435.002532] 7b60: ffff8000fb0a7ba0 ffff8000000824e0 00000000000001c0 0000000000000000
[  435.082888] 7b80: ffff8000fffc9c18 0000000000000000 0000000000000000 ffff8000fffc9c38
[  435.161800] 7ba0: ffff8000fffc9c20 ffff8000fffcbd90 ffff8000fb07a8a0 ffff8000fb0a7d30
[  435.241358] 7bc0: 0000000000000740 ffff8000006654c0 7fffffffffffffff 000000000000015d
[  435.320268] 7be0: 0000000007a12000 0000000000000000 ffffffffffffffff 00000000000006bf
[  435.400058] 7c00: 000000000000000a 0000000000000140 ffff8000fffc9c18 0000000000000000
[  435.480115] 7c20: 0000000000000000 0000000000000000 ffff800000a01fb0 ffff800000976b80
[  435.559422] 7c40: ffff80000095ac18 ffff800000a01fa8 ffff800000976d10 ffff8000fb0a7c90
[  435.639019] 7c60: ffff8000000c9cf8 ffff8000fb0a7c90 ffff8000000c9954 00000000600001c5
[  435.717883] 7c80: ffff8000fb079660 ffff8000fffcbd00 ffff8000fb0a7ce0 ffff8000000c9cf8
[  435.798428] 7ca0: 0000000000000140 0000000000000000 0000000000000000 0000000000000000
[  435.877701] 7cc0: 0000000000000000 ffff800000a01fb0 ffff800000976b80 ffff80000095ac18
[  435.958362] 7ce0: ffff8000fb0a7cf0 ffff8000000c9dbc ffff8000fb0a7d30 ffff80000015a62c
[  436.038866] 7d00: ffff8000009ea900 ffff800000976000 0000000000000000 ffff80000015a578
[  436.117761] 7d20: 0000000000000000 ffff8000fffc9c18 ffff8000fb0a7d90 ffff8000000ca4e4
[  436.197913] 7d40: ffff8000fb01a100 ffff80000098cc80 ffff8000fffcb500 ffff8000fffcf900
[  436.277733] 7d60: 0000000000000000 0000000000000000 0000000000000001 ffff8000fffcb570
[  436.357775] 7d80: ffff8000fffcb7a0 ffff8000fffcb518 ffff8000fb0a7dd0 ffff8000000ca7e4
[  436.437968] 7da0: ffff8000fb01a100 ffff8000fffcb518 ffff8000fffcb500 ffff8000fb01a130
[  436.519458] 7dc0: ffff8000fb0a4000 ffff8000009ed41b ffff8000fb0a7e30 ffff8000000cff48
[  436.599611] 7de0: ffff8000fb019980 ffff8000009f6068 ffff800000804850 ffff8000fb01a100
[  436.679963] 7e00: ffff8000000ca6b0 0000000000000000 0000000000000000 0000000000000000
[  436.759838] 7e20: 0000000000000000 0000000000000000 0000000000000000 ffff800000085c50
[  436.839999] 7e40: ffff8000000cfe68 ffff8000fb019980 0000000000000000 0000000000000000
[  436.919678] 7e60: 0000000000000000 ffff8000000d8338 ffff8000000cfe68 0000000000000000
[  436.998534] 7e80: 0000000000000000 ffff8000fb01a100 0000000000000000 0000000000000000
[  437.078593] 7ea0: ffff8000fb0a7ea0 ffff8000fb0a7ea0 0000000000000001 ffff800000010001
[  437.157980] 7ec0: ffff8000fb0a7ec0 ffff8000fb0a7ec0 0000000000000000 0000000000000000
[  437.237834] 7ee0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  437.317975] 7f00: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  437.398218] 7f20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  437.478921] 7f40: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  437.557830] 7f60: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  437.638134] 7f80: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  437.717824] 7fa0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  437.798335] 7fc0: 0000000000000000 0000000000000000 0000000000000000 0000000000000005
[  437.878433] 7fe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  437.958714] Call trace:
[  437.985407] [<ffff8000000d04f4>] kthread_data+0x4/0xc
[  438.038843] [<ffff80000064cd14>] __schedule+0x29c/0x590
[  438.092977] [<ffff80000064d04c>] schedule+0x44/0xa8
[  438.143355] [<ffff8000000b80a0>] do_exit+0x5b4/0x944
[  438.195279] [<ffff800000089a24>] die+0x1a8/0x1c0
[  438.244027] [<ffff8000000958f8>] __do_kernel_fault.part.3+0x74/0x84
[  438.308748] [<ffff800000093f08>] do_page_fault+0x274/0x2e8
[  438.365505] [<ffff80000009403c>] do_translation_fault+0xc0/0xf0
[  438.426376] [<ffff8000000822a0>] do_mem_abort+0x40/0xa0
[  438.481106] Exception stack(0xffff8000fb0a7ad0 to 0xffff8000fb0a7bf0)
[  438.548193] 7ac0:                                   0000000000000140 ffff8000fffc9c18
[  438.627311] 7ae0: ffff8000fb0a7c90 ffff8000000c9954 0000000000000001 ffff8000fb0a7be0
[  438.707560] 7b00: ffff800000979000 ffff000000021000 ffff80000064d04c 0000000000000000
[  438.787970] 7b20: ffff8000fffcb7a0 ffff8000fffcb518 ffff8000fb0a7b50 ffff8000000b9164
[  438.867917] 7b40: ffff80000095a000 0000000a04208060 ffff8000fb0a7b60 ffff8000000f258c
[  438.948300] 7b60: ffff8000fb0a7ba0 ffff8000000824e0 00000000000001c0 0000000000000000
[  439.028752] 7b80: ffff8000fffc9c18 0000000000000000 0000000000000000 ffff8000fffc9c38
[  439.109386] 7ba0: ffff8000fffc9c20 ffff8000fffcbd90 ffff8000fb07a8a0 ffff8000fb0a7d30
[  439.188232] 7bc0: 0000000000000740 ffff8000006654c0 7fffffffffffffff 000000000000015d
[  439.267547] 7be0: 0000000007a12000 0000000000000000
[  439.318168] [<ffff800000085428>] el1_da+0x18/0x70
[  439.366426] [<ffff8000000c9cf8>] __queue_delayed_work+0x9c/0x110
[  439.427448] [<ffff8000000c9dbc>] queue_delayed_work_on+0x50/0x6c
[  439.489942] [<ffff80000015a62c>] vmstat_shepherd+0xe8/0x134
[  439.548704] [<ffff8000000ca4e4>] process_one_work+0x138/0x304
[  439.607732] [<ffff8000000ca7e4>] worker_thread+0x134/0x40c
[  439.663682] [<ffff8000000cff48>] kthread+0xe0/0xf4
[  439.712676] [<ffff800000085c50>] ret_from_fork+0x10/0x40
[  439.766998] Code: 97ffff88 a8c17bfd d65f03c0 f941fc00 (f85d8000)