[Dnsmasq-discuss] [BUG] RA are sent too fast and slows down the machine

[Petr Mensik]

Hi Iain,

of course. I am sorry, forgot to add a link as intended[1]. Used base
report from Network Manager tester report. I added it to Fedora bug
mentioned, but forgot to add script itself. At least to me, it produces
tens of RA announces.

Regards,
Petr

[1]
https://github.com/InfrastructureServices/dnsmasq-tests/blob/master/bz1739797.sh

On 8/27/19 10:45 AM, Iain Lane wrote:
> On Wed, Aug 21, 2019 at 08:59:07PM +0200, Petr Mensik wrote:
>> Hi Simon and Maarten,
>>
>> we discovered when playing with NetworkManager-ci [1], that lastest
>> release is somehow broken. Test running dnsmasq are quite slow on latest
>> release.
>>
>> I have created repeatable started script that reproduces it. Then used
>> git bisect to find when it was broken. It seems fast sending were
>> intentional in commit 0a496f059c1e9 [2], but maybe way it affects the
>> system were underestimated. It is significant for systems that hit such
>> issue. I think it has to be fixed to slow it down to short time
>> interval, not endless loop. Reported as Fedora bug [3].
> 
> Thanks for this Petr. Would you be able to share the script you've used,
> so that perhaps an upstream developer could recreate the bug?
> 
> Mainly I wanted to chime in and say that (in addition to the other
> instance referenced), we found this in the NetworkManager testsuite in
> Ubuntu. I didn't come up with a nice reproducer at the time, but we did
> identify the same commit and we've reverted it in Ubuntu. I posted on
> the ML back then but we didn't get much traction and I didn't follow up
> very aggressively.
> 
>   http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2018q4/012709.html
> 
>   https://launchpadlibrarian.net/405377161/dnsmasq_2.80-1_2.80-1ubuntu1.diff.gz
>   (the commit ID referenced in the changelog there seems or from
>   somewhere else, it's the same patch)
> 
> Cheers,
> 
> 
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> 

-- 
Petr Menšík
Software Engineer
Red Hat, http://www.redhat.com/
email: pemensik at redhat.com  PGP: 65C6C973

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