Comment 6 for bug 1662666
Revision history for this message
| bugproxy (bugproxy) wrote Comment bridged from LTC Bugzilla | #6 |
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f33e652
(Get the code!)
-- Problem Description --
The following upstream patches are needed for Ubuntu to fix a hang situation reported when executing ppc64_cpu --smt=on that occurs with various disk types. We need whichever ones have not yet been pulled into the base.
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The hang problem can be reproduced with the following shell script using an NVMe device executed on kernel versions 4.4.0-45 and 4.4.0-59 within 30 minutes. It was also reproduced on a 4.8.0-32-generic kernel, although it took over 3 hours to manifest.
#!/bin/bash
if [[ ${#} -eq 0 ]]; then
${0} breaker &
while true; do
dd if=/dev/nvme0n1 bs=1024k of=/dev/null
done
elif [[ ${1} == "breaker" ]]; then
while true; do
ppc64_cpu --smt=off
sleep 5
ppc64_cpu --smt=on
sleep 5
done
fi
Steve,
Can Foundations take a look at this request, please.
Michael
On 02/07/2017 12:39 PM, Launchpad Bug Tracker wrote:
> bugproxy (bugproxy) has assigned this bug to you for Ubuntu:
>
> -- Problem Description --
> The following upstream patches are needed for Ubuntu to fix a hang situation reported when executing ppc64_cpu --smt=on that occurs with various disk types. We need whichever ones have not yet been pulled into the base.
>
> https:/
> https:/
> https:/
> https:/
> https:/
> https:/
> https:/
>
> The hang problem can be reproduced with the following shell script using
> an NVMe device executed on kernel versions 4.4.0-45 and 4.4.0-59 within
> 30 minutes. It was also reproduced on a 4.8.0-32-generic kernel,
> although it took over 3 hours to manifest.
>
> #!/bin/bash
>
> if [[ ${#} -eq 0 ]]; then
> ${0} breaker &
> while true; do
> dd if=/dev/nvme0n1 bs=1024k of=/dev/null
> done
> elif [[ ${1} == "breaker" ]]; then
> while true; do
> ppc64_cpu --smt=off
> sleep 5
> ppc64_cpu --smt=on
> sleep 5
> done
> fi
>
> ** Affects: ubuntu
> Importance: Undecided
> Assignee: Taco Screen team (taco-screen-team)
> Status: New
>
>
> ** Tags: architecture-
--
Michael Hohnbaum
OIL Program Manager
Power (ppc64el) Development Project Manager
Canonical, Ltd.
Correction: the hang reproduced by the previous shell script is actually being fixed separately. These commits fix various other problems with NVMe drives and are required as a prerequisite .
On Tue, Feb 07, 2017 at 12:42:39PM -0800, Michael Hohnbaum wrote:
> Can Foundations take a look at this request, please.
The bug is assigned to the linux package, so the kernel team should probably
be looking at it.
--
Steve Langasek Give me a lever long enough and a Free OS
Debian Developer to set it on, and I can move the world.
Ubuntu Developer http://
<email address hidden> <email address hidden>
Leann,
While the problem is in ppc64-cpu command, it appears the fix is in a
set of kernel patches. Can you have the kernel team take a look at
these. Thanks.
Michael
On 02/07/2017 01:05 PM, Steve Langasek wrote:
> On Tue, Feb 07, 2017 at 12:42:39PM -0800, Michael Hohnbaum wrote:
>> Can Foundations take a look at this request, please.
> The bug is assigned to the linux package, so the kernel team should probably
> be looking at it.
>
--
Michael Hohnbaum
OIL Program Manager
Power (ppc64el) Development Project Manager
Canonical, Ltd.
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