Date: Sun, 7 Mar 2021 22:45:04 +0000 From: "Alexander V. Chernikov" <melifaro@ipfw.ru> To: Kristof Provost <kp@FreeBSD.org> Cc: "current@FreeBSD.org" <current@freebsd.org>, "Bjoern A. Zeeb" <bz@freebsd.org> Subject: Re: ifa leak on VNET teardown Message-ID: <E1A53BB8-7A9B-4687-9FC3-0D0D6583C643@ipfw.ru> In-Reply-To: <FE498C9E-2C58-4BCF-8B06-961DD722F387@FreeBSD.org> References: <275831613248826@mail.yandex.ru> <FE498C9E-2C58-4BCF-8B06-961DD722F387@FreeBSD.org>
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> On 6 Mar 2021, at 09:26, Kristof Provost <kp@FreeBSD.org> 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&p2p interfaces. D29121 addresses that. > > Best regards, > Kristofhelp
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