kernel-packages team mailing list archive

["dave.muysson" <dave.muysson@xxxxxxxxx>]

Dan,

  Just checking in with a status update. Our main system experiencing
the issue is a production system, so loading the custom kernel wasn’t an
option at the time. I have since created a clone of our production
server and am trying to reproduce the issue now.

  I will let you know once the issue reoccurs on our cloned environment.

Dave Muysson | Cloud Architect
dave.muysson@xxxxxxxxx <mailto:dave.muysson@xxxxxxxxx> |​ (613) 562-2525 x 510 <tel:6135622525,510> |​ 360pi.com <http://360pi.com/>


> On Oct 13, 2015, at 9:37 AM, Dave Muysson <dave.muysson@xxxxxxxxx> wrote:
> 
> Dan,
> 
>   I haven’t tried to directly reproduce the bug, but I have a few ideas. If I can free up some time I’ll see if I can reproduce it.
> 
> 
> Dave Muysson | Cloud Architect
> dave.muysson@xxxxxxxxx <mailto:dave.muysson@xxxxxxxxx> |​ (613) 562-2525 x 510 <tel:6135622525,510> |​ 360pi.com <http://360pi.com/>
> 
> 
> 
>> On Oct 13, 2015, at 9:20 AM, Dan Streetman <dan.streetman@xxxxxxxxxxxxx <mailto:dan.streetman@xxxxxxxxxxxxx>> wrote:
>> 
>> Hi Dave,
>> 
>> are you able to reproduce the bug?  The trace by itself isn't terribly helpful, all it really says is the pageblock spans zones, which means move_freepages_block() logic for detecting that failed for some reason.  I have a debug kernel ppa here:
>> pad.lv/ppa/ddstreet/lp1497428
>> 
>> that includes additional debug if the problem happens (it also should
>> prevent the BUG()).  If you can use that kernel to trigger this and send
>> the resulting debug output it would help very much :-)
>> 
>> when the problem reproduces, in the system log you should see:
>> page_zone(start_page) !=page_zone(end_page)
>> 
>> and more debug following that.  It should not trigger BUG() though, so
>> you may need to check the logs periodically.
>> 
>> Thanks!
>> 
>> -- 
>> You received this bug notification because you are subscribed to the bug
>> report.
>> https://bugs.launchpad.net/bugs/1497428 <https://bugs.launchpad.net/bugs/1497428>
>> 
>> Title:
>>  kernel BUG at /build/buildd/linux-3.13.0/mm/page_alloc.c:968
>> 
>> Status in linux package in Ubuntu:
>>  In Progress
>> Status in linux source package in Trusty:
>>  In Progress
>> 
>> Bug description:
>>  The kernel triggers a BUG when it finds it is in move_freepages() but
>>  the start and end pfns for the move are in different zones.
>> 
>> To manage notifications about this bug go to:
>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497428/+subscriptions
>

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1497428

Title:
  kernel BUG at /build/buildd/linux-3.13.0/mm/page_alloc.c:968

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  In Progress

Bug description:
  The kernel triggers a BUG when it finds it is in move_freepages() but
  the start and end pfns for the move are in different zones.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497428/+subscriptions