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[Craig Magina <1404335@xxxxxxxxxxxxxxxxxx>]

Here is an output from the console of a system experiencing this issue.

This bug occurs after executing "sudo poweroff" and "sudo shutdown -h now" This issue was found on trusty-updates and trusty-
proposed. It wasn't seen in the released version.

$ uname -a
Linux am5 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:32:32 UTC 2014 aarch64 aarch64 aarch64 GNU/Linux

U-Boot 2013.04-mustang_sw_1.13.28-beta (Aug 25 2014 - 14:16:10)

ubuntu@am5:~$ sudo poweroff

Broadcast message from ubuntu@am5
 (/dev/ttyS0) at 17:33 ...

The system is going down for power off NOW!
ubuntwait-for-state stop/waiting
 * Stopping rsync daemon rsync [ OK ]
 * Asking all remaining processes to terminate... [ OK ]
 * All processes ended within 1 seconds... [ OK ]
 * Deactivating swap... [ OK ]
 * Unmounting local filesystems... [ OK ]
 * Will now halt
[22800.565563] reboot: System halted
[22828.004581] BUG: soft lockup - CPU#0 stuck for 23s! [halt:2059]
[22856.004581] BUG: soft lockup - CPU#0 stuck for 23s! [halt:2059]
[22884.004581] BUG: soft lockup - CPU#0 stuck for 22s! [halt:2059]
[22912.004580] BUG: soft lockup - CPU#0 stuck for 22s! [halt:2059]
[22940.004580] BUG: soft lockup - CPU#0 stuck for 22s! [halt:2059]
[22968.004580] BUG: soft lockup - CPU#0 stuck for 22s! [halt:2059]
[22996.004580] BUG: soft lockup - CPU#0 stuck for 22s! [halt:2059]
[23024.004580] BUG: soft lockup - CPU#0 stuck for 22s! [halt:2059]
[23052.004580] BUG: soft lockup - CPU#0 stuck for 22s! [halt:2059]
[23080.004580] BUG: soft lockup - CPU#0 stuck for 22s! [halt:2059]
[23108.004580] BUG: soft lockup - CPU#0 stuck for 23s! [halt:2059]
[23136.004580] BUG: soft lockup - CPU#0 stuck for 23s! [halt:2059]
[23164.004580] BUG: soft lockup - CPU#0 stuck for 23s! [halt:2059]
[23192.004580] BUG: soft lockup - CPU#0 stuck for 23s! [halt:2059]
[23220.004580] BUG: soft lockup - CPU#0 stuck for 23s! [halt:2059]
[23248.004580] BUG: soft lockup - CPU#0 stuck for 22s! [halt:2059]
[23276.004580] BUG: soft lockup - CPU#0 stuck for 22s! [halt:2059]
[23304.004580] BUG: soft lockup - CPU#0 stuck for 22s! [halt:2059]
[23332.004580] BUG: soft lockup - CPU#0 stuck for 22s! [halt:2059]
[23360.004580] BUG: soft lockup - CPU#0 stuck for 22s! [halt:2059]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1404335

Title:
  xgene: BUG: soft lockup - CPU#0 stuck for 23s! [halt:2059] on poweroff

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  [Impact]
  Fixes an issue where after the system halts the cpu starts to experience soft lockups.

  [Test Case]
  The most reliable means of reproducing this issue is to 'sudo poweroff' the system from the console.

  [Regression Potential]
  These patches are upstream patches that have been in the utopic kernel for quite a while and only affect the arm64 architecture.

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