** Changed in: linux-azure (Ubuntu)
Status: In Progress => Incomplete
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https://bugs.launchpad.net/bugs/1822118
Title:
Kernel Panic while rebooting cloud instance
Status in linux-azure package in Ubuntu:
Incomplete
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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