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[Bug 1497878] Re: nx842: Corrupted data during uncompression due to HW issue

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Tim Gardner <tim.gardner@xxxxxxxxxxxxx>
Date: Tue, 20 Oct 2015 13:37:15 -0000
Reply-to: Bug 1497878 <1497878@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Also affects: linux (Ubuntu Wily)
   Importance: High
     Assignee: Canonical Kernel Team (canonical-kernel-team)
       Status: Triaged

** Also affects: linux (Ubuntu X-series)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Wily)
       Status: Triaged => In Progress

** Changed in: linux (Ubuntu Wily)
     Assignee: Canonical Kernel Team (canonical-kernel-team) => Tim Gardner (timg-tpi)

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https://bugs.launchpad.net/bugs/1497878

Title:
  nx842: Corrupted data during uncompression due to HW issue

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Wily:
  In Progress
Status in linux source package in x-series:
  New

Bug description:
  == Comment: #0 - Haren Myneni <hbabu@xxxxxxxxxx> - 2015-09-19 20:35:29 ==
  ---Problem Description---
  Hardware team reported some rare data corruption during uncompression for nx842 co-processor. It might provide user with invalid data after uncompression. So the fix is add CRC support - means Linux adds CRC flag before calling the nx842 so that CRC will be added and checked during compression and uncompression calls.  

   
  Contact Information = hbabu@xxxxxxxxxx 
   
  ---uname output---
  Ubuntu 15.10
   
  Machine Type = power8 
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
   HW team reported this issue and discussed with them for the possible solution.
   
  Stack trace output:
   no
   
  Oops output:
   no
   
  System Dump Info:
    The system is not configured to capture a system dump.
   
  *Additional Instructions for hbabu@xxxxxxxxxx: 
  -Attach sysctl -a output output to the bug.

  == Comment: #1 - Haren Myneni <hbabu@xxxxxxxxxx> - 2015-09-19 20:36:14 ==
  The fix is simple with just adding CRC flags before invoking nx842 coprocessor calls. Posted patch and waiting for maintainer to get in to his tree. 

  http://marc.info/?l=linux-crypto-vger&m=144270742211554&w=2

  Please include this fix in ubuntu 15.10 release.

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