> On 6 Mar 2021, at 09:26, Kristof Provost wrote:
>
> On 13 Feb 2021, at 21:58, Alexander V. Chernikov wrote:
>> It turns out we're leaking some ifas for loopback interfaces on VNET
>> teardown:
>>
> There’s a recent bug about this as well: 253998.
> The problem’s been around for a long time though. The pf tests trigger it
> from time to time, although it doesn’t appear to be 100% consistent, so my
> current feeling is that it may be racy.
>
> I see ‘in6_purgeaddr: err=65, destination address delete failed’ when we do
> leak, and I’ve also been able to confirm this is about the ::1 IPv6 loopback
> address.
The fun part is that it turns out that these side effects are caused by 3
different issues. The unifying factor is that all of them are loopback-specific.
AF_LINK ifa leak exists simply because there is no domain teardown procedure
associated with AF_LINK, so we leak it for every non-vmoved interface during
VNET shutdown.
PR 253998 is caused by the fact that rt_flushifroutes_af() is not able to
delete RTF_PINNED routes (e.g. all interface routes). D29116 addresses that.
in6_purgeaddr error is caused by the corner case with loopback interfaces.
D29121 addresses that.
>
> Best regards,
> Kristof
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