Re: [Xen-devel] Linux 3.18 no longer boots under Xen, please fix

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 20.05.19 at 13:41, <wei.liu2@xxxxxxxxxx> wrote:
> On Mon, May 20, 2019 at 11:46:16AM +0100, Ian Jackson wrote:
>> This has been true for some time.  osstest has been sending automatic
>> mails including bisection reports like the one below, for about a
>> month.
>> 
>> osstest's "tested and good" branch of linux-3.18 is 190 days behind
>> the upstream tip.
>> 
>> Do we care about this at all ?
>> 
>> Note that the Xen Project does not have a dedicated team of QA
>> engineers who do triage of test reports.  It is up to every maintainer
>> of every Xen-related component to keep an eye on these test reports
>> and investigate failures.
>> 
>> For the avoidance of any doubt, osstest's "bisection complete" reports
>> can always be relied on to accurately identify a real, repeatable,
>> regression.  osstest will only make such a report if it has reproduced
>> several times both the failure at the commit it blames, and the
>> success at the commit it says is OK.  (In trees with a lot of merging,
>> the commit that is blamed is sadly often a merge, but one of its
>> parents will be identified as good.)
>> 
>> In this case osstest has sent a significant number of functionally
>> identical reports saying it has identified a regression in lots of
>> different tests.  But this has not resulted in any action AFAIAA.
>> 
>> Please would someone involved with the Linux kernel end of things pick
>> this up.
>> 
>> Thanks,
>> Ian.
>> 
>> osstest service owner writes ("[linux-3.18 bisection] complete 
> test-amd64-amd64-xl"):
>> > branch xen-unstable
>> > xenbranch xen-unstable
>> > job test-amd64-amd64-xl
>> > testid xen-boot
>> > 
>> > Tree: linux 
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
>> > Tree: linuxfirmware git://xenbits.xen.org/osstest/linux-firmware.git
>> > Tree: ovmf git://xenbits.xen.org/osstest/ovmf.git
>> > Tree: qemu git://xenbits.xen.org/qemu-xen-traditional.git
>> > Tree: qemuu git://xenbits.xen.org/qemu-xen.git
>> > Tree: xen git://xenbits.xen.org/xen.git
>> > 
>> > *** Found and reproduced problem changeset ***
>> > 
>> >   Bug is in tree:  linux 
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
>> >   Bug introduced:  6b1ae527b1fdee86e81da0cb26ced75731c6c0fa
>> >   Bug not present: ba6984fc0162f24a510ebc34e881b546b69c553b
>> >   Last fail repro: 
>> > http://logs.test-lab.xenproject.org/osstest/logs/136574/ 
>> > 
> 
> 
> It seems that there is something wrong with the IGB driver.

Which in turn reminds me of a patch of mine that was backported
(and spotted by an earlier bisection), and that I've suggested
(twice already iirc) was either backported in error, or without some
further necessary changes. Iirc the stable tree maintainer for that
branch was Cc-ed back then, and if so I'd conclude he doesn't care.

Jan



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