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[Ubuntu Foundations Team Bug Bot <1547718@xxxxxxxxxxxxxxxxxx>]

** Tags added: patch

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https://bugs.launchpad.net/bugs/1547718

Title:
  4.4.0-7.22 no longer boots on arm64

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Xenial:
  Confirmed

Bug description:
  Observed on X-Gene and ThunderX.

  [    2.059489] kernel BUG at /build/linux-RKt9qy/linux-4.4.0/mm/memory.c:1887!
  [    2.066418] Internal error: Oops - BUG: 0 [#1] SMP
  [    2.071185] Modules linked in:
  [    2.074234] CPU: 1 PID: 156 Comm: systemd-udevd Not tainted 4.4.0-7-generic #22-Ubuntu
  [    2.082109] Hardware name: APM X-Gene Mustang board (DT)
  [    2.087393] task: ffff8001f679d780 ti: ffff8001df4a4000 task.ti: ffff8001df4a4000
  [    2.094840] PC is at apply_to_page_range+0x330/0x378
  [    2.099780] LR is at change_memory_common+0x94/0x148
  [    2.104717] pc : [<ffff8000001f8f20>] lr : [<ffff80000009a964>] pstate: 60000145
  [    2.112073] sp : ffff8001df4a7b30
  [    2.115369] x29: ffff8001df4a7b30 x28: 0000000000000000 
  [    2.120671] x27: ffff7ffffc00f000 x26: ffff7ffffc009550 
  [    2.125974] x25: ffff80000009aa18 x24: ffff7ffffc009500 
  [    2.131276] x23: ffff8001df4a7c38 x22: ffff80000009a878 
  [    2.136579] x21: ffff800000d56000 x20: ffff7ffffc00f000 
  [    2.141881] x19: ffff7ffffc00f000 x18: ffff80000090f928 
  [    2.147183] x17: ffff8001df4a79e8 x16: b4cc9cbc209fc557 
  [    2.152485] x15: ffffffffffffffff x14: ffff000000000000 
  [    2.157788] x13: ffffffffffffffff x12: 0000000000000010 
  [    2.163091] x11: 0000000000000018 x10: 0101010101010101 
  [    2.168393] x9 : ffffffffffffffff x8 : 7f7f7f7f7f7f7f7f 
  [    2.173694] x7 : 636e712cff646b61 x6 : 000000802e726f64 
  [    2.178996] x5 : 646f722e00000000 x4 : ffff8001df4a7c38 
  [    2.184298] x3 : ffff80000009a878 x2 : 0000000000000000 
  [    2.189601] x1 : ffff7ffffc00f000 x0 : ffff80000009a964 
  [    2.194902] 
  [    2.196384] Process systemd-udevd (pid: 156, stack limit = 0xffff8001df4a4020)
  [    2.203568] Stack: (0xffff8001df4a7b30 to 0xffff8001df4a8000)
  [    2.209283] 7b20:                                   ffff8001df4a7bf0 ffff80000009a964
  [    2.217073] 7b40: ffff7ffffc00f000 ffff7ffffc00f000 ffff800000d56000 0008000000000000
  [    2.224862] 7b60: 0000000000000080 ffff7ffffc009500 ffff80000009aa18 ffff7ffffc009550
  [    2.232651] 7b80: ffff8001df4a7df0 0000000000000000 ffff800000f11800 ffff7ffffc00efff
  [    2.240440] 7ba0: ffff7ffffc00f000 ffff7ffffc00f000 ffff7ffffc00f000 ffff800000000000
  [    2.248227] 7bc0: ffff7ffffc00efff 0000000000000000 ffff800000d93af0 ffff800000d93af0
  [    2.256016] 7be0: ffff8001df4a7c40 ffff800000d93af0 ffff8001df4a7c50 ffff80000009aac8
  [    2.263805] 7c00: ffff7ffffc00f000 0000000000000000 ffff7ffffc009300 ffff800000d56000
  [    2.271594] 7c20: ffff800000d80000 0000000000000080 0008000000000000 0000000000000080
  [    2.279383] 7c40: 0008000000000000 cb88537fdc8ba602 ffff8001df4a7c70 ffff800000145400
  [    2.287172] 7c60: ffff7ffffc009550 ffff80000009aa98 ffff8001df4a7c90 ffff800000147350
  [    2.294961] 7c80: ffff7ffffc009300 ffff80000009aa98 ffff8001df4a7cb0 ffff8000001499cc
  [    2.302750] 7ca0: ffff7ffffc009318 ffff8001df4a7e68 ffff8001df4a7e30 ffff800000149ec8
  [    2.310539] 7cc0: ffff800000d56000 0000000000000000 0000000000000006 0000ffff94668108
  [    2.318327] 7ce0: 0000000080000000 0000000000000015 000000000000011d 0000000000000111
  [    2.326116] 7d00: ffff8000008d7000 ffff8001df4a4000 ffff000000adb000 ffff800000e35220
  [    2.333905] 7d20: ffff800000e354a0 ffff7ffffc00f000 ffff000000aef878 ffff8000008e7f68
  [    2.341693] 7d40: 0000000000000072 ffff800100000064 ffff80010000006e 0000003f00000000
  [    2.349482] 7d60: ffff7ffffc00f000 0000000000000018 ffff8001df4a7e30 ffff800000149e8c
  [    2.357271] 7d80: ffff800000d56000 0000000000000000 0000000000000006 0000ffff94668108
  [    2.365060] 7da0: 0000000000000000 0000000000000000 0000000000000000 ffff800000000000
  [    2.372849] 7dc0: 0000000000000000 ffff81a400000000 0000000000000000 0000000000000000
  [    2.380638] 7de0: 0000000000000000 0000000000000000 00006c656e72656b 0000000000000000
  [    2.388427] 7e00: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    2.396216] 7e20: 0000000000000000 cb88537fdc8ba602 0000ffffc2eeb2c0 ffff800000085c70
  [    2.404005] 7e40: 0000000000000000 0000000000000000 ffffffffffffffff 0000ffff945a8b54
  [    2.411794] 7e60: 000000000000011d ffff000000adb000 00000000000148f8 ffff000000aef078
  [    2.419583] 7e80: ffff000000aeef28 ffff000000ae9860 000000000000a000 000000000000c130
  [    2.427372] 7ea0: ffff7ffffc009220 0000000100000005 0000002100000020 0000001400000019
  [    2.435161] 7ec0: 0000000000000013 cb88537fdc8ba602 0000000000000006 0000ffff94668108
  [    2.442950] 7ee0: 0000000000000000 0000000000000006 0000000000000000 0000ffffc2eeb238
  [    2.450739] 7f00: 644d39656dff7364 644d39656dff7364 0000000000000111 0000000000000002
  [    2.458528] 7f20: 0101010101010101 000000000000000c 0000000000000010 6567782f6d70612f
  [    2.466317] 7f40: 656e6567782f656e 0000ffff944e7694 0000ffff945a8b30 0000ffff9467a1d0
  [    2.474105] 7f60: 0000000000000000 0000aaaad2a8a500 0000000000000000 0000ffff94668108
  [    2.481894] 7f80: 0000aaaad2a99d90 0000000000020000 0000000000000000 0000aaaad2a8a380
  [    2.489682] 7fa0: 0000000000000000 0000000000020000 0000ffffc2eeb450 0000ffffc2eeb2c0
  [    2.497471] 7fc0: 0000ffff94661980 0000ffffc2eeb2c0 0000ffff945a8b54 0000000080000000
  [    2.505260] 7fe0: 0000000000000006 0000000000000111 0000000000000000 0000000000000000
  [    2.513047] Call trace:
  [    2.515481] [<ffff8000001f8f20>] apply_to_page_range+0x330/0x378
  [    2.521455] [<ffff80000009a964>] change_memory_common+0x94/0x148
  [    2.527429] [<ffff80000009aac8>] set_memory_ro+0x30/0x40
  [    2.532714] [<ffff800000145400>] frob_rodata+0x50/0x78
  [    2.537824] [<ffff800000147350>] module_enable_ro+0x58/0x68
  [    2.543366] [<ffff8000001499cc>] load_module+0x12a4/0x14c8
  [    2.548822] [<ffff800000149ec8>] SyS_finit_module+0xf0/0x128
  [    2.554451] [<ffff800000085c70>] el0_svc_naked+0x24/0x28
  [    2.559735] Code: 97fff8a0 35fffbe0 f9400300 17ffffce (d4210000) 
  [    2.565807] ---[ end trace a9373e7fe017e4db ]---

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