kernel-packages team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Thanks for the update, Chris.  The patch "storvsc: use small
sg_tablesize on x86" has not landed in mainline yet, but I can submit an
SRU request to include it as an Ubuntu SAUCE patch.

However, for Trusty I think we need to increase MAX_PAGE_BUFFER_COUNT in
addition to the patch "storvsc: use small sg_tablesize on x86".  In my
testing a Trusty kernel with only the storvsc patch will still panic.
But a Trusty kernel with the storvsc patch and a value of 32 for
MAX_PAGE_BUFFER_COUNT will not panic.


There was actually a commit in v3.15-rc1, written by KY:
commit 7e5ec36834a5752304dc0751dfab42ba6ad64a85
Author: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Date:   Fri Mar 7 00:10:34 2014 -0800

    Drivers: hv: vmbus: Increase the limit on the number of pfns we can
handle


So for Trusty I think we need commit 7e5ec368 and the patch "storvsc: use small sg_tablesize on x86".

I built two Trusty test kernels.  One has only the  "storvsc: use small
sg_tablesize on x86" patch.  The other has a cherry pick of commit
7e5ec368  and the  "storvsc: use small sg_tablesize on x86" patch.


Ovidiu R, if you have a chance can you test these two kernels?  Before I submit the new patch, I'd like to confirm if we also need commit 7e5ec368 or not.


Test kernel with only the new patch:
http://kernel.ubuntu.com/~jsalisbury/lp1495983/patched-kernel/trusty/trusty-with-only-use-small-sg_tablesize/


Test kernel with the new patch and a cherry pick of 7e5ec368:
http://kernel.ubuntu.com/~jsalisbury/lp1495983/patched-kernel/trusty/trusty-with-use-small-sg_tablesizeANDCommit7e5ec368/

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https://bugs.launchpad.net/bugs/1495983

Title:
  [Hyper-V] kernel panic occurs when installing Ubuntu Server 15.10 x32

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

Bug description:
  Attempting to install the latest build of Ubuntu Server 15.10 (Wily
  Werewolf) x32 on Hyper-V, after beginning installation a kernel panic
  occurs. The console log from the serial output is attached.

  http://cdimage.ubuntu.com/ubuntu-server/daily/current/

  I tried with the builds from 14th and 15th of September with the same result. This bug does not affect x64 builds. 
  Tried to start the installation with different resources with no effect, kernel panic always occurs no matter the VM settings.

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