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[Louis Bouchard <louis.bouchard@xxxxxxxxxxxxx>]

Re-targetting the bug to the linux kernel as this is not a makedumpfile
issue

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

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https://bugs.launchpad.net/bugs/1687779

Title:
  Ubuntu 16.04.2: kdump is not working in 4.8.0-46 kernel

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

Bug description:
  I'm not able to take a crashdump on Ubuntu Xenial 16.04.2 in 4.8.0-46 kernel.
  This issue seems to be fixed mainstream: https://lkml.org/lkml/2017/1/9/77

  
  kdump-tools                         1:1.5.9-5ubuntu0.4
  makedumpfile                        1:1.5.9-5ubuntu0.4
  linux-image-4.8.0-46-generic        4.8.0-46.49~16.04.1

  # kdump-config show

  DUMP_MODE:        kdump
  USE_KDUMP:        1
  KDUMP_SYSCTL:     kernel.panic_on_oops=1
  KDUMP_COREDIR:    /var/crash
  crashkernel addr: 0x2b000000
     /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-4.8.0-46-generic
  kdump initrd:
     /var/lib/kdump/initrd.img: symbolic link to /var/lib/kdump/initrd.img-4.8.0-46-generic
  current state:    ready to kdump

  kexec command:
    /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-4.8.0-46-generic root=LABEL=cloudimg-rootfs ro nmi_watchdog=0 elevator=deadline net.ifnames=1 cgroup_enable=memory swapaccount=1 console=ttyS0,115200 console=tty1 irqpoll nr_cpus=1 nousb systemd.unit=kdump-tools.service" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz

  The kernel trace

  [   10.738064] BUG: unable to handle kernel NULL pointer dereference at 0000000000000088
  [   10.740946] IP: [<ffffffff88e1afc2>] hswep_uncore_cpu_init+0x52/0xa0
  [   10.743571] PGD 0
  [   10.744482] Oops: 0000 [#1] SMP
  [   10.745615] Modules linked in:
  [   10.747000] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.8.0-46-generic #49~16.04.1-Ubuntu
  [   10.750255] Hardware name: HP ProLiant BL460c Gen9, BIOS I36 02/17/2017
  [   10.752574] task: ffff8f16b2938ec0 task.stack: ffff8f16b2940000
  [   10.754892] RIP: 0010:[<ffffffff88e1afc2>]  [<ffffffff88e1afc2>] hswep_uncore_cpu_init+0x52/0xa0
  [   10.758371] RSP: 0018:ffff8f16b2943e40  EFLAGS: 00010206
  [   10.760337] RAX: 0000000000000050 RBX: 0000000000000000 RCX: 000000000000238a
  [   10.762787] RDX: ffff8f16b01f47e0 RSI: ffff8f16b2c1c700 RDI: 0000000000000000
  [   10.765289] RBP: ffff8f16b2943e50 R08: 000000000001c700 R09: ffffffff89231a97
  [   10.767968] R10: ffffea0000c07000 R11: 0000000000000000 R12: ffffffff89c1a030
  [   10.770399] R13: ffffffff89ea7760 R14: ffffffff89c0daf8 R15: ffff8f16b2c19300
  [   10.772894] FS:  0000000000000000(0000) GS:ffff8f16b2c00000(0000) knlGS:0000000000000000
  [   10.775945] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [   10.777935] CR2: 0000000000000088 CR3: 000000002d806000 CR4: 00000000001406f0
  [   10.780398] Stack:
  [   10.781154]  ffff8f16b2943e50 00000000df388e ffff8f16b2943e88 ffffffff89d8b292
  [   10.884602]  0000000000000000 0000000000000105 ffffffff89d8b196 ffffffff89c0daf8
  [   10.887394]  ffff8f16b2c19300 ffff8f16b2943f08 ffffffff88e02190 ffffffff88ea377f
  [   10.890699] Call Trace:
  [   10.891596]  [<ffffffff89d8b292>] intel_uncore_init+0xfc/0x2d6
  [   10.893587]  [<f? uncore_type_init+0x15f/0x15f
  [   11.395474]  [<ffffffff88e02190>] do_one_initcall+0x50/0x1a0
  [   11.397431]  [<ffffffff88ea377f>] ? parse_args+0x2cf/0x490
  [   11.399313]  [<ffffffff89d86175>] kernel_init_freeable+0x178/0x217
  [   11.402112]  [<ffffffff8968d2ce>] kernel_init+0xe/0x100
  [   11.404013]  [<ffffffff8969aa1f>] ret_from_fork+0x1f/0x40
  [   11.405895]  [<ffffffff8968d2c0>] ? rest_init+0x80/0x80
  [   11.407720] Code: 01 f4 00 39 15 2c 02 e0 00 7e 06 89 15 24 02 e0 00 48 98 48 8b 15 57 36 0e 01 48 8d 04 40 48 8d 04 c2 48 8b 40 10 48 85 c0 74 1b <8b> 70 38 48 8b 78 10 48 8d 4d f4 ba 94 00 00 00 e8 49 e2 45 00
  [   11.422367] RIP  [<ffffffff88e1afc2>] hswep_uncore_cpu_init+0x52/0xa0
  [   11.425174]  RSP <ffff8f16b2943e40>
  [   11.426588] CR2: 0000000000000088
  [   11.427978] ---[ end trace d8adbfe4355f5160 ]---
  [   11.430006] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
  [   11.430006]
  [   11.433354] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
  [   11.433354]

  Please find the full kernel trace

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