[Bug 1822118] Re: Kernel Panic while rebooting cloud instance

[Robert Važan]

I can confirm this bug. My VPS servers are configured to automatically
reboot daily and one of them started hanging up with similar error a few
days ago. I am using Ubuntu 18.10 x64 running on Vultr VPS. When the VPS
hanged today, the screen ended with these messages:


[  OK  ] Reached target Shutdown.
[  OK  ] Reached target Final Step.
         Starting Reboot...
[

(several blank lines here)

/shutdown: error while loading shared libraries: libidn.so.11: cannot
open shared object file: No such file or directory


The name of the library changes randomly with every hangup.

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Title:
  Kernel Panic while rebooting cloud instance

Status in linux-azure package in Ubuntu:
  In Progress
Status in systemd package in Ubuntu:
  New

Bug description:
  Description:   In the event a particular Azure cloud instance is
  rebooted it's possible that it may never recover and the instance will
  break indefinitely.

  In My case, it was a kernel panic. See specifics below..

  
  Series: Disco
  Instance Size: Basic_A3
  Region: (Default) US-WEST-2
  Kernel Version: 4.18.0-1013-azure #13-Ubuntu SMP Thu Feb 28 22:54:16 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

  
  I had a simple script to reboot an instance (X) amount of times, I chose 50, so the machine would power cycle by issuing a "reboot" from the terminal prompt just as a user would.   Once the machine came up, it captured dmesg and other bits then rebooted again until it reached 50. 

  After the 4th attempt, my script timed out, I took a look at the
  instance console log and the following displayed on the console.

  
  [  OK  ] Reached target Reboot.
  /shutdown: error while loading shared libra[   89.498980] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00007f00
  [   89.498980]
  [   89.500042] CPU: 0 PID: 1 Comm: shutdown Not tainted 4.18.0-1013-azure #13-Ubuntu
  [   89.508026] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007  06/02/2017
  [   89.508026] Call Trace:
  [   89.508026]  dump_stack+0x63/0x8a
  [   89.508026]  panic+0xe7/0x247
  [   89.508026]  do_exit.cold.23+0x26/0x75
  [   89.508026]  do_group_exit+0x43/0xb0
  [   89.508026]  __x64_sys_exit_group+0x18/0x20
  [   89.508026]  do_syscall_64+0x5a/0x110
  [   89.508026]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
  [   89.508026] RIP: 0033:0x7f7bf0154d86
  [   89.508026] Code: Bad RIP value.
  [   89.508026] RSP: 002b:00007ffd6be693b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
  [   89.508026] RAX: ffffffffffffffda RBX: 00007f7bf015e420 RCX: 00007f7bf0154d86
  [   89.508026] RDX: 000000000000007f RSI: 000000000000003c RDI: 000000000000007f
  [   89.508026] RBP: 00007f7bef9449c0 R08: 00000000000000e7 R09: 00000000ffffffff
  [   89.508026] R10: 00007ffd6be6974c R11: 0000000000000206 R12: 0000000000000018
  [   89.508026] R13: 00007f7bef944ac8 R14: 00007f7bef944a00 R15: 0000000000000000
  [   89.508026] Kernel Offset: 0x16000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
  [   89.508026] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00007f00
  [   89.508026]  ]---

  
  this only occurred once in my testing.

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