trusty/linux-azure: 4.15.0-1100.111~14.04.1 -proposed tracker

Still exhibits this behavior (known issue):

Create VM on Azure using Canonical UbuntuServer 14.04.5-LTS latest using size Standard DS2 v2
Install kexec-tools kdump-tools makedumpfile, configure boot kernel parameter crashkernel=512M
Run sed -i 's/USE_KDUMP=0/USE_KDUMP=1/g' /etc/default/kdump-tools and sed -i 's/LOAD_KEXEC=true/LOAD_KEXEC=false/g' /etc/default/kexec
Reboot VM, make sure crash kernel memory reserved successfully
Trigger a crash by run echo 1 > /proc/sys/kernel/sysrq, then echo c > /proc/sysrq-trigger, VM will reboot automatically and after reboot, check crash dump is generated under /var/crash
Install linux-azure kernel
Enable private-ppa canonical-kernel-esm
Install kernel linux-azure, reboot VM, kernel version 4.15.0-1084-azure
Trigger a crash by run echo 1 > /proc/sys/kernel/sysrq, then echo c > /proc/sysrq-trigger, VM entered into a hung status.

Attach whole serial console
[ 65.452007] INFO: rcu_sched detected stalls on CPUs/tasks:
[ 65.456004] 1-...!: (0 ticks this GP) idle=488/0/0 softirq=1/1 fqs=0
[ 65.456004] (detected by 0, t=15002 jiffies, g=707, c=706, q=8457)
[ 65.456004] rcu_sched kthread starved for 15002 jiffies! g707 c706 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=1
[ 360.020026] INFO: rcu_sched detected stalls on CPUs/tasks:
[ 360.024015] 1-...!: (10 GPs behind) idle=b34/0/0 softirq=1/1 fqs=1
[ 360.024015] (detected by 0, t=15002 jiffies, g=717, c=716, q=6429)
[ 360.024015] rcu_sched kthread starved for 15000 jiffies! g717 c716 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=1
[ 420.048010] INFO: rcu_sched detected stalls on CPUs/tasks:
[ 420.052006] 1-...!: (0 ticks this GP) idle=f94/0/0 softirq=1/1 fqs=0
[ 420.052006] (detected by 0, t=15002 jiffies, g=718, c=717, q=6429)
[ 420.052006] rcu_sched kthread starved for 15002 jiffies! g718 c717 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=1

Reference to known bug: https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1882623

4.15.0-1100.111~14.04.1 - azure
Regression test CMPL, RTB.

Issue to note in x86_64 (azure):
  ubuntu_kvm_unit_tests - apic timeouted (bug 1748103) memory (bug 1854342) umip (1821905) vmx (bug 1821394) vmx_host_state_area (bug 1866585) vmx_intr_window_test (bug 1866586) vmx_nm_test timeout (bug 1872419) vmx_nmi_window_test (bug 1866588) vmx_pending_event_test (bug 1866591) failed on Standard_D48_v3, Standard_F2s_v2, Standard_F32s_v2
  ubuntu_ltp_syscalls - clock_gettime04 failed on Basic_A2 fanotify09 case 3 (bug 1876684) getrusage04 on Basic_A2 (bug 1841425) move_pages12 on Standard_D48_v3 (bug 1831043) openat03 (bug 1798027) prctl07 (bug 1839064) ptrace10 (bug 1900951) shmctl04 (bug 1895276)
  ubuntu_lxc - lxc tests failed on Azure T-4.15 (bug 1813878)
  ubunut_qrt_apparmor - timed out on Standard-B1ms (bug 1783922)

Skipped / blacklisted:
  * ubuntu_fan_smoke_test
  * ubuntu_kernel_selftests
  * ubuntu_ltp
  * ubuntu_lttng_smoke_test
  * ubuntu_nbd_smoke_test
  * ubuntu_sysdig_smoke_test
  * ubuntu_zfs_smoke_test

All tasks have been completed and the bug is being set to Fix Released