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Date:   Wed, 30 Aug 2017 09:35:14 -0700
From:   Kees Cook <>
To:     Mike Galbraith <>
Cc:     LKML <>, Ingo Molnar <>,
        "Reshetova, Elena" <>
Subject: Re: tip -ENOBOOT - bisected to locking/refcounts, x86/asm: Implement
 fast refcount overflow protection

On Tue, Aug 29, 2017 at 10:02 PM, Mike Galbraith <> wrote:
> On Tue, 2017-08-29 at 11:41 -0700, Kees Cook wrote:
>> Can you also test with 14afee4b6092 ("net: convert sock.sk_wmem_alloc
>> from atomic_t to refcount_t") reverted (instead of ARCH_HAS_REFCOUNT
>> disabled)?
> Nogo.

Thanks for checking!

> [   44.901930] WARNING: CPU: 5 PID: 0 at net/netlink/af_netlink.c:374 netlink_sock_destruct+0x82/0xa0

This is so odd if 14afee4b6092 is reverted. What is line 374 for you
in net/netlink/af_netlink.c?


Kees Cook
Pixel Security

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