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[Ben Howard <ben.howard@xxxxxxxxxxxxx>]

Public bug reported:

During Alpha-2 automated testing, I saw the following in a log:

19:35:02  [    2.475810] systemd-udevd[95]: starting version 204
19:35:02  [    2.547049] ------------[ cut here ]------------
19:35:02  [    2.547065] WARNING: CPU: 0 PID: 97 at /build/buildd/linux-3.16.0/mm/vmalloc.c:128 vmap_page_range_noflush+0x2d1/0x370()
19:35:02  [    2.547069] Modules linked in:
19:35:02  [    2.547073] CPU: 0 PID: 97 Comm: systemd-udevd Not tainted 3.16.0-6-generic #11-Ubuntu
19:35:02  [    2.547077]  0000000000000009 ffff880002defb98 ffffffff81755538 0000000000000000
19:35:02  [    2.547082]  ffff880002defbd0 ffffffff8106bb0d ffff88000400ec88 0000000000000001
19:35:02  [    2.547086]  ffff880002fcfb00 ffffffffc0391000 0000000000000000 ffff880002defbe0
19:35:02  [    2.547090] Call Trace:
19:35:02  [    2.547096]  [<ffffffff81755538>] dump_stack+0x45/0x56
19:35:02  [    2.547101]  [<ffffffff8106bb0d>] warn_slowpath_common+0x7d/0xa0
19:35:02  [    2.547104]  [<ffffffff8106bbea>] warn_slowpath_null+0x1a/0x20
19:35:02  [    2.547108]  [<ffffffff81197c31>] vmap_page_range_noflush+0x2d1/0x370
19:35:02  [    2.547112]  [<ffffffff81197cfe>] map_vm_area+0x2e/0x40
19:35:02  [    2.547115]  [<ffffffff8119a058>] __vmalloc_node_range+0x188/0x280
19:35:02  [    2.547120]  [<ffffffff810e92b4>] ? module_alloc_update_bounds+0x14/0x70
19:35:02  [    2.547124]  [<ffffffff810e92b4>] ? module_alloc_update_bounds+0x14/0x70
19:35:02  [    2.547129]  [<ffffffff8104f294>] module_alloc+0x74/0xd0
19:35:02  [    2.547132]  [<ffffffff810e92b4>] ? module_alloc_update_bounds+0x14/0x70
19:35:02  [    2.547135]  [<ffffffff810e92b4>] module_alloc_update_bounds+0x14/0x70
19:35:02  [    2.547146]  [<ffffffff810e9a6c>] layout_and_allocate+0x74c/0xc70
19:35:02  [    2.547149]  [<ffffffff810ea063>] load_module+0xd3/0x1b70
19:35:02  [    2.547154]  [<ffffffff811cfeb1>] ? vfs_read+0xf1/0x170
19:35:02  [    2.547157]  [<ffffffff810e7aa1>] ? copy_module_from_fd.isra.46+0x121/0x180
19:35:02  [    2.547161]  [<ffffffff810ebc76>] SyS_finit_module+0x86/0xb0
19:35:02  [    2.547167]  [<ffffffff8175de7f>] tracesys+0xe1/0xe6
19:35:02  [    2.547169] ---[ end trace 8a5de7fc66e75fe4 ]---
19:35:02  [    2.547172] vmalloc: allocation failure, allocated 20480 of 24576 bytes
19:35:02  [    2.547175] systemd-udevd: page allocation failure: order:0, mode:0xd2
19:35:02  [    2.547180] CPU: 0 PID: 97 Comm: systemd-udevd Tainted: G        W     3.16.0-6-generic #11-Ubuntu
19:35:02  [    2.547183]  ffffffff81a88bc0 ffff880002defc08 ffffffff81755538 00000000000000d2
19:35:02  [    2.547187]  ffff880002defc90 ffffffff811642bf ffffffff81a88bc0 ffff880002defc28
19:35:02  [    2.547191]  00003fff00000018 ffff880002defca0 ffff880002defc40 0000000000000163
19:35:02  [    2.547195] Call Trace:
19:35:02  [    2.547197]  [<ffffffff81755538>] dump_stack+0x45/0x56
19:35:02  [    2.547202]  [<ffffffff811642bf>] warn_alloc_failed+0xdf/0x130
19:35:02  [    2.547207]  [<ffffffff8119a118>] __vmalloc_node_range+0x248/0x280
19:35:02  [    2.547210]  [<ffffffff810e92b4>] ? module_alloc_update_bounds+0x14/0x70
19:35:02  [    2.547214]  [<ffffffff810e92b4>] ? module_alloc_update_bounds+0x14/0x70
19:35:02  [    2.547217]  [<ffffffff8104f294>] module_alloc+0x74/0xd0
19:35:02  [    2.547220]  [<ffffffff810e92b4>] ? module_alloc_update_bounds+0x14/0x70
19:35:02  [    2.547224]  [<ffffffff810e92b4>] module_alloc_update_bounds+0x14/0x70
19:35:02  [    2.547229]  [<ffffffff810e9a6c>] layout_and_allocate+0x74c/0xc70
19:35:02  [    2.547232]  [<ffffffff810ea063>] load_module+0xd3/0x1b70
19:35:02  [    2.547235]  [<ffffffff811cfeb1>] ? vfs_read+0xf1/0x170
19:35:02  [    2.547238]  [<ffffffff810e7aa1>] ? copy_module_from_fd.isra.46+0x121/0x180
19:35:02  [    2.547242]  [<ffffffff810ebc76>] SyS_finit_module+0x86/0xb0
19:35:02  [    2.547246]  [<ffffffff8175de7f>] tracesys+0xe1/0xe6
19:35:02  [    2.547248] Mem-Info:

** Affects: linux (Ubuntu)
     Importance: High
         Status: Confirmed

** Package changed: ubuntu => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1350522

Title:
  EC2 kernel crash due to vmalloc

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  During Alpha-2 automated testing, I saw the following in a log:

  19:35:02  [    2.475810] systemd-udevd[95]: starting version 204
  19:35:02  [    2.547049] ------------[ cut here ]------------
  19:35:02  [    2.547065] WARNING: CPU: 0 PID: 97 at /build/buildd/linux-3.16.0/mm/vmalloc.c:128 vmap_page_range_noflush+0x2d1/0x370()
  19:35:02  [    2.547069] Modules linked in:
  19:35:02  [    2.547073] CPU: 0 PID: 97 Comm: systemd-udevd Not tainted 3.16.0-6-generic #11-Ubuntu
  19:35:02  [    2.547077]  0000000000000009 ffff880002defb98 ffffffff81755538 0000000000000000
  19:35:02  [    2.547082]  ffff880002defbd0 ffffffff8106bb0d ffff88000400ec88 0000000000000001
  19:35:02  [    2.547086]  ffff880002fcfb00 ffffffffc0391000 0000000000000000 ffff880002defbe0
  19:35:02  [    2.547090] Call Trace:
  19:35:02  [    2.547096]  [<ffffffff81755538>] dump_stack+0x45/0x56
  19:35:02  [    2.547101]  [<ffffffff8106bb0d>] warn_slowpath_common+0x7d/0xa0
  19:35:02  [    2.547104]  [<ffffffff8106bbea>] warn_slowpath_null+0x1a/0x20
  19:35:02  [    2.547108]  [<ffffffff81197c31>] vmap_page_range_noflush+0x2d1/0x370
  19:35:02  [    2.547112]  [<ffffffff81197cfe>] map_vm_area+0x2e/0x40
  19:35:02  [    2.547115]  [<ffffffff8119a058>] __vmalloc_node_range+0x188/0x280
  19:35:02  [    2.547120]  [<ffffffff810e92b4>] ? module_alloc_update_bounds+0x14/0x70
  19:35:02  [    2.547124]  [<ffffffff810e92b4>] ? module_alloc_update_bounds+0x14/0x70
  19:35:02  [    2.547129]  [<ffffffff8104f294>] module_alloc+0x74/0xd0
  19:35:02  [    2.547132]  [<ffffffff810e92b4>] ? module_alloc_update_bounds+0x14/0x70
  19:35:02  [    2.547135]  [<ffffffff810e92b4>] module_alloc_update_bounds+0x14/0x70
  19:35:02  [    2.547146]  [<ffffffff810e9a6c>] layout_and_allocate+0x74c/0xc70
  19:35:02  [    2.547149]  [<ffffffff810ea063>] load_module+0xd3/0x1b70
  19:35:02  [    2.547154]  [<ffffffff811cfeb1>] ? vfs_read+0xf1/0x170
  19:35:02  [    2.547157]  [<ffffffff810e7aa1>] ? copy_module_from_fd.isra.46+0x121/0x180
  19:35:02  [    2.547161]  [<ffffffff810ebc76>] SyS_finit_module+0x86/0xb0
  19:35:02  [    2.547167]  [<ffffffff8175de7f>] tracesys+0xe1/0xe6
  19:35:02  [    2.547169] ---[ end trace 8a5de7fc66e75fe4 ]---
  19:35:02  [    2.547172] vmalloc: allocation failure, allocated 20480 of 24576 bytes
  19:35:02  [    2.547175] systemd-udevd: page allocation failure: order:0, mode:0xd2
  19:35:02  [    2.547180] CPU: 0 PID: 97 Comm: systemd-udevd Tainted: G        W     3.16.0-6-generic #11-Ubuntu
  19:35:02  [    2.547183]  ffffffff81a88bc0 ffff880002defc08 ffffffff81755538 00000000000000d2
  19:35:02  [    2.547187]  ffff880002defc90 ffffffff811642bf ffffffff81a88bc0 ffff880002defc28
  19:35:02  [    2.547191]  00003fff00000018 ffff880002defca0 ffff880002defc40 0000000000000163
  19:35:02  [    2.547195] Call Trace:
  19:35:02  [    2.547197]  [<ffffffff81755538>] dump_stack+0x45/0x56
  19:35:02  [    2.547202]  [<ffffffff811642bf>] warn_alloc_failed+0xdf/0x130
  19:35:02  [    2.547207]  [<ffffffff8119a118>] __vmalloc_node_range+0x248/0x280
  19:35:02  [    2.547210]  [<ffffffff810e92b4>] ? module_alloc_update_bounds+0x14/0x70
  19:35:02  [    2.547214]  [<ffffffff810e92b4>] ? module_alloc_update_bounds+0x14/0x70
  19:35:02  [    2.547217]  [<ffffffff8104f294>] module_alloc+0x74/0xd0
  19:35:02  [    2.547220]  [<ffffffff810e92b4>] ? module_alloc_update_bounds+0x14/0x70
  19:35:02  [    2.547224]  [<ffffffff810e92b4>] module_alloc_update_bounds+0x14/0x70
  19:35:02  [    2.547229]  [<ffffffff810e9a6c>] layout_and_allocate+0x74c/0xc70
  19:35:02  [    2.547232]  [<ffffffff810ea063>] load_module+0xd3/0x1b70
  19:35:02  [    2.547235]  [<ffffffff811cfeb1>] ? vfs_read+0xf1/0x170
  19:35:02  [    2.547238]  [<ffffffff810e7aa1>] ? copy_module_from_fd.isra.46+0x121/0x180
  19:35:02  [    2.547242]  [<ffffffff810ebc76>] SyS_finit_module+0x86/0xb0
  19:35:02  [    2.547246]  [<ffffffff8175de7f>] tracesys+0xe1/0xe6
  19:35:02  [    2.547248] Mem-Info:

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