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[nmeier <nmeier@xxxxxxxxxxxxx>]

It was requested that I test Ballooning on 14.04.02.
Ballooning fails on 14.04.02.

Ballooning test on 14.04.02 after running apt-get upgrade
  Startup Memory : 2048
  Minimum Memory : 1024
  Maximum Memory : 8192
The utility stressapptest was used to generate memory demand.
Let memory settle to 2048MB assigned, 644MB demand.
Addd memory demand of 1664MB
Assigned memory grew to 2624MB assigned, 2125MB demand.
Let system settle to 1044MB assigned, 428MB demand
Added memory demand of 1664MB
Assigned memory grew to 2732MB assigned, 2376MB demand.
After all instances of stressapptest terminated demand dropped to 464MB
Assigned memory did not balloon down after 15 minutes.
Configured second VM to have a startup memory value to consume all of the hosts free memory.
Test VM assigned memory did not balloon down.
The dmesg log has stack traces for hung_task_timeout_secs.
The call traces are trying to add pages.
See attached file.

** Attachment added: "dmesg.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1440103/+attachment/4412805/+files/dmesg.log

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https://bugs.launchpad.net/bugs/1440103

Title:
  [Hyper-V] Kernel panic not functional on Vivid

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Issue description:
  Triggering a kernel panic will not produce a crash dump file.

  Steps to Reproduce:
  1. install kdump related packages.
  2. verify crashmem value - defaults to 384M-:129M
  3. verify that the system is ready for crash:
          # cat /sys/kernel/kexec_crash_loaded
          1
  4. trigger kernel panic with # echo c | sudo tee /proc/sysrq-trigger
  5. The system will freeze and no kernel dump will be generated, system is not rebooted automatically as configured in kdump-tools config.

  Versions details:
  Windows Server Host Edition: Microsoft Windows Server 2012 R2 Datacenter build 9600
  Distribution name and release: Ubuntu Vivid Vervet
  Kernel version: Linux ubuntu31 3.19.0-11-generic #11lp14233432v201504021617 SMP

  Repro output with VM settings as follows:
  2GB RAM, 1vCPU, crashmem: 384M:128M OR 384M:128M

  [  149.328829] SysRq : Trigger a crash
  [  149.342418] BUG: unable to handle kernel NULL pointer dereference at           (null)
  [  149.346369] IP: [<ffffffff814ae776>] sysrq_handle_crash+0x16/0x20
  [  149.346369] PGD 367a3067 PUD 7bdf0067 PMD 0
  [  149.346369] Oops: 0002 [#1] SMP
  [  149.346369] Modules linked in: joydev hid_generic hid_hyperv serio_raw hid 8250_fintek hyperv_keyboard hv_balloon hyp
  erv_fb i2c_piix4 mac_hid autofs4 hv_netvsc hv_utils hv_storvsc psmouse floppy pata_acpi hv_vmbus
  [  149.346369] CPU: 0 PID: 1379 Comm: tee Not tainted 3.19.0-11-generic #11lp14233432v201504021617
  [  149.346369] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090006  05/23/2012
  [  149.346369] task: ffff88007a7d3ae0 ti: ffff88007be7c000 task.ti: ffff88007be7c000
  [  149.346369] RIP: 0010:[<ffffffff814ae776>]  [<ffffffff814ae776>] sysrq_handle_crash+0x16/0x20
  [  149.346369] RSP: 0018:ffff88007be7fe68  EFLAGS: 00010292
  [  149.346369] RAX: 000000000000000f RBX: 0000000000000063 RCX: 000000000000000f
  [  149.346369] RDX: ffff88007ce0fd78 RSI: ffff88007ce0e498 RDI: 0000000000000063
  [  149.346369] RBP: ffff88007be7fe68 R08: 0000000000000002 R09: 0000000000000275
  [  149.346369] R10: 0000000000000092 R11: 0000000000000275 R12: 0000000000000004
  [  149.346369] R13: 0000000000000000 R14: ffffffff81cb38e0 R15: 0000000000000008
  [  149.346369] FS:  00007f0a2e22a700(0000) GS:ffff88007ce00000(0000) knlGS:0000000000000000
  [  149.346369] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  [  149.346369] CR2: 0000000000000000 CR3: 0000000036047000 CR4: 00000000000006f0
  [  149.346369] Stack:
  [  149.346369]  ffff88007be7fe98 ffffffff814aef96 0000000000000002 fffffffffffffffb
  [  149.346369]  00007ffc64e934b0 0000000000000002 ffff88007be7feb8 ffffffff814af443
  [  149.346369]  00007ffc64e934b0 ffff8800364f15c0 ffff88007be7fed8 ffffffff8125ad98
  [  149.346369] Call Trace:
  [  149.346369]  [<ffffffff814aef96>] __handle_sysrq+0x106/0x170
  [  149.346369]  [<ffffffff814af443>] write_sysrq_trigger+0x33/0x40
  [  149.346369]  [<ffffffff8125ad98>] proc_reg_write+0x48/0x70
  [  149.346369]  [<ffffffff811f33d7>] vfs_write+0xb7/0x1f0
  [  149.346369]  [<ffffffff811f3ece>] ? vfs_read+0x11e/0x140
  [  149.346369]  [<ffffffff811f3fe6>] SyS_write+0x46/0xb0
  [  149.346369]  [<ffffffff817c924d>] system_call_fastpath+0x16/0x1b
  [  149.346369] Code: ef e8 df f7 ff ff eb d8 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 66 66 66 66 90 55 c7 05 34 42 a3 00
  01 00 00 00 48 89 e5 0f ae f8 <c6> 04 25 00 00 00 00 01 5d c3 66 66 66 66 90 55 31 c0 48 89 e5
  [  149.346369] RIP  [<ffffffff814ae776>] sysrq_handle_crash+0x16/0x20
  [  149.346369]  RSP <ffff88007be7fe68>
  [  149.346369] CR2: 0000000000000000
  [    0.000000] Initializing cgroup subsys cpuset
  [    0.000000] Initializing cgroup subsys cpu
  [    0.000000] Initializing cgroup subsys cpuacct
  [    0.000000] Linux version 3.19.0-11-generic (apw@gloin) (gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu12) ) #11lp14233432v
  201504021617 SMP Thu Apr 2 15:15:51 UTC 2015 (Ubuntu 3.19.0-11.11lp14233432v201504021617-generic 3.19.3)
  [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.19.0-11-generic root=/dev/mapper/ubuntu31--vg-root ro console=tty0 co
  nsole=ttyS1 irqpoll maxcpus=1 nousb systemd.unit=kdump-tools.service elfcorehdr=867700K

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