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[Ubuntu Foundations Team Bug Bot <1496317@xxxxxxxxxxxxxxxxxx>]

** Tags added: patch

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https://bugs.launchpad.net/bugs/1496317

Title:
  kexec fails with OOM killer with the current crashkernel=128 value

Status in kexec-tools package in Ubuntu:
  In Progress

Bug description:
  With a very basic Wily image, just trigger a crash with sysrq-trigger
  after installing and setting up linux-crashdump and the kexec will
  fail with the following :

  [    0.334592] Trying to unpack rootfs image as initramfs...
  [    0.649440] swapper/0 invoked oom-killer: gfp_mask=0x200d2, order=0, oom_score_adj=0
  [    0.650332] swapper/0 cpuset=/ mems_allowed=0
  [    0.650856] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G        W       4.2.0-7-generic #7-Ubuntu
  [    0.651788] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
  [    0.652691]  ffff88002fd906c8 ffff88002fcf76a8 ffffffff817b0465 000000000000000f
  [    0.653556]  ffff88002fd90000 ffff88002fcf7738 ffffffff817ae2b5 ffff88002ffc0e28
  [    0.654418]  ffff880033c164c0 ffff880033c16530 ffff88002fd90068 ffff88002fcf7748
  ...
  [    0.682339] Mem-Info:                                                                                 [756/1897]
  [    0.682599] active_anon:0 inactive_anon:0 isolated_anon:0
  [    0.682599]  active_file:2023 inactive_file:0 isolated_file:0
  [    0.682599]  unevictable:14845 dirty:0 writeback:0 unstable:0
  [    0.682599]  slab_reclaimable:1722 slab_unreclaimable:632
  [    0.682599]  mapped:0 shmem:0 pagetables:0 bounce:0
  [    0.682599]  free:0 free_pcp:2 free_cma:0
  [    0.685982] Node 0 DMA free:0kB min:0kB low:0kB high:0kB active_anon:0kB inactive_anon:0kB active_file:0kB inact
  ive_file:0kB unevictable:540kB isolated(anon):0kB isolated(file):0kB present:632kB managed:548kB mlocked:0kB dirty:
  0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:8kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB 
  unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:540 all_unreclaimab
  le? yes
  [    0.690450] lowmem_reserve[]: 0 0 0 0
  [    0.690928] Node 0 DMA32 free:0kB min:0kB low:0kB high:0kB active_anon:0kB inactive_anon:0kB active_file:8092kB 
  inactive_file:0kB unevictable:58840kB isolated(anon):0kB isolated(file):0kB present:130420kB managed:78064kB mlocke
  d:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:6880kB slab_unreclaimable:2528kB kernel_stack:4
  64kB pagetables:0kB unstable:0kB bounce:0kB free_pcp:8kB local_pcp:8kB free_cma:0kB writeback_tmp:0kB pages_scanned
  :58840 all_unreclaimable? yes
  [    0.695547] lowmem_reserve[]: 0 0 0 0
  [    0.696049] Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0k
  B
  [    0.697335] Node 0 DMA32: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 
  0kB
  [    0.698641] 16868 total pagecache pages
  [    0.699075] 0 pages in swap cache
  [    0.699448] Swap cache stats: add 0, delete 0, find 0/0
  [    0.700029] Free swap  = 0kB
  [    0.700356] Total swap = 0kB
  [    0.700679] 32763 pages RAM
  [    0.700991] 0 pages HighMem/MovableOnly
  [    0.701418] 13110 pages reserved
  [    0.701778] 0 pages cma reserved
  [    0.702139] 0 pages hwpoisoned
  [    0.702481] [ pid ]   uid  tgid total_vm      rss nr_ptes nr_pmds swapents oom_score_adj name
  [    0.703423] Kernel panic - not syncing: Out of memory and no killable processes...

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