linux-kernel - Freeze when using ipheth+IPsec+IPv6

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Date:   Tue, 5 Jun 2018 10:54:51 +0200
From:   Yves-Alexis Perez <corsac@...sac.net>
To:     linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Hans Liljestrand <ishkamiel@...il.com>,
        David Windsor <dwindsor@...il.com>,
        Kees Cook <keescook@...omium.org>,
        "Reshetova, Elena" <elena.reshetova@...el.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Mateusz Jurczyk <mjurczyk@...gle.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        David Herrmann <dh.herrmann@...il.com>, netdev@...r.kernel.org,
        Alexander Kappner <agk@...king.net>,
        Johannes Berg <johannes.berg@...el.com>,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        Arvind Yadav <arvind.yadav.cs@...il.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: Freeze when using ipheth+IPsec+IPv6

Hi,

since some kernels releases (I didn't test thorougly but at least 4.16
and 4.17) I have regular freezes in certain situations on my laptop.

It seems to happen when I:

- tether using my iPhone (involving ipheth)
- mount an IPsec tunnel over IPv4
- run evolution to fetch my mail (IMAP traffic over IPv6 inside the IPv4
  IPsec tunnel)

When I do that, the interface seems to freeze. Last time the mouse was
still moving so the kernel didn't completely crash, but the UI was
completely irresponsive. I managed to get the attached log from
/sys/fs/pstore with refcount_t stuff pointing to an underflow.

Since this doesn't happen if all three conditions aren't met, I've added
a lot of people to the CC: list, sorry for the noise.

I can try to add debugging here and there if needed, but any pointer to
where would be helpful. I'm especially puzzled about the presence of
net/unix/af_unix.c:491 unix_sock_destructor+0x97/0xc0 in the log.

Regards,
-- 
Yves-Alexis

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