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[Ubuntu Foundations Team Bug Bot <1576564@xxxxxxxxxxxxxxxxxx>]

** Tags added: patch

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https://bugs.launchpad.net/bugs/1576564

Title:
  Xen 32bit dom0 on 64bit hypervisor: bad page flags

Status in linux package in Ubuntu:
  Triaged
Status in xen package in Ubuntu:
  Invalid

Bug description:
  This problem is a mix between running certain versions of 32bit Linux
  kernel dom0 on certain versions of 64bit Xen hypervisor, combined with
  certain memory clamping settings (dom0_mem=xM, without setting the max
  limit).

  Xen 4.4.2 + Linux 3.13.x
  Xen 4.5.0 + linux 3.19.x
  Xen 4.6.0 + linux 4.0.x
  Xen 4.6.0 + linux 4.1.x
   -> all boot without messages
  Xen 4.5.1 + Linux 4.2.x
  Xen 4.6.0 + Linux 4.2.x
  Xen 4.6.0 + Linux 4.3.x
   * dom0_mem 512M, 4096M, or unlimited
     -> boot without messages
   * dom0_mem between 1024M and 3072M (inclusive)
     -> bad page messages (but finishes boot)
  Xen 4.6.0 + Linux 4.4.x
  Xen 4.6.0 + Linux 4.5.x
  Xen 4.6.0 + Linux 4.6-rc6
   The boot for 512M,4096M, and unlimited looks good as well. Though trying to
   start a domU without dom0_mem set caused a crash when ballooning (but I
   think this should be a seperate bug)
   Using a dom0_mem range between 1G and 3G it looks like still producing the
   bad page flags bug message and additionally panicking + reboot.

  The bad page bug generally looks like this (the pfn numbers seem to be
  towards the end of the allocated range.

  [    8.980150] BUG: Bad page state in process swapper/0  pfn:7fc22
  [    8.980238] page:f4566550 count:0 mapcount:0 mapping:  (null) index:0x0
  [    8.980328] flags: 0x7000400(reserved)
  [    8.980486] page dumped because: PAGE_FLAGS_CHECK_AT_PREP flag set
  [    8.980575] bad because of flags:
  [    8.980688] flags: 0x400(reserved)
  [    8.980844] Modules linked in:
  [    8.980960] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G    B           4.2.0-19-
  generic #23-Ubuntu
  [    8.981084] Hardware name: Supermicro H8SGL/H8SGL, BIOS 3.0        08/31/2012
  [    8.981177]  c1a649a7 23e07668 00000000 e9cafce4 c175e501 f4566550 e9cafd08 c
  1166897
  [    8.981608]  c19750a4 e9d183ec 0007fc22 007fffff c1975630 c1978e86 00000001 e
  9cafd74
  [    8.982074]  c1169f83 00000002 00000141 0004a872 c1af3644 00000000 ee44bce4 e
  e44bce4
  [    8.982506] Call Trace:
  [    8.982582]  [<c175e501>] dump_stack+0x41/0x52
  [    8.982666]  [<c1166897>] bad_page+0xb7/0x110
  [    8.982749]  [<c1169f83>] get_page_from_freelist+0x2d3/0x610
  [    8.982838]  [<c116a4f3>] __alloc_pages_nodemask+0x153/0x910
  [    8.982926]  [<c122ee62>] ? find_entry.isra.13+0x52/0x90
  [    8.983013]  [<c11b0f75>] ? kmem_cache_alloc_trace+0x175/0x1e0
  [    8.983102]  [<c10b1c96>] ? __raw_callee_save___pv_queued_spin_unlock+0x6/0x10
  [    8.983223]  [<c11b0ddd>] ? __kmalloc+0x21d/0x240
  [    8.983308]  [<c119cc2e>] __vmalloc_node_range+0x10e/0x210
  [    8.983433]  [<c1148fa7>] ? bpf_prog_alloc+0x37/0xa0
  [    8.983518]  [<c119cd96>] __vmalloc_node+0x66/0x70
  [    8.983604]  [<c1148fa7>] ? bpf_prog_alloc+0x37/0xa0
  [    8.983689]  [<c119cdd4>] __vmalloc+0x34/0x40
  [    8.983773]  [<c1148fa7>] ? bpf_prog_alloc+0x37/0xa0
  [    8.983859]  [<c1148fa7>] bpf_prog_alloc+0x37/0xa0
  [    8.983944]  [<c167cc8c>] bpf_prog_create+0x2c/0x90
  [    8.984034]  [<c1b6741e>] ? bsp_pm_check_init+0x11/0x11
  [    8.984121]  [<c1b68401>] ptp_classifier_init+0x2b/0x44
  [    8.984207]  [<c1b6749a>] sock_init+0x7c/0x83
  [    8.984291]  [<c100211a>] do_one_initcall+0xaa/0x200
  [    8.984376]  [<c1b6741e>] ? bsp_pm_check_init+0x11/0x11
  [    8.984463]  [<c1b1654c>] ? repair_env_string+0x12/0x54
  [    8.984551]  [<c1b16cf6>] ? kernel_init_freeable+0x126/0x1d9
  [    8.984726]  [<c1755fb0>] kernel_init+0x10/0xe0
  [    8.984846]  [<c10929b1>] ? schedule_tail+0x11/0x50
  [    8.984932]  [<c1764141>] ret_from_kernel_thread+0x21/0x30
  [    8.985019]  [<c1755fa0>] ? rest_init+0x70/0x70

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