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Message-ID: <CAM_iQpX=Vb-0xMjwOrriYcG38GT+U9zknggVbCb0_pBUh1NMkQ@mail.gmail.com>
Date: Wed, 1 Mar 2017 09:18:49 -0800
From: Cong Wang <xiyou.wangcong@...il.com>
To: Dmitry Vyukov <dvyukov@...gle.com>
Cc: David Miller <davem@...emloft.net>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
James Morris <jmorris@...ei.org>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Patrick McHardy <kaber@...sh.net>,
Eric Dumazet <edumazet@...gle.com>,
netdev <netdev@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
syzkaller <syzkaller@...glegroups.com>
Subject: Re: net/ipv4: deadlock in ip_ra_control
On Wed, Mar 1, 2017 at 2:44 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> Hello,
>
> I've got the following deadlock report while running syzkaller fuzzer
> on linux-next/51788aebe7cae79cb334ad50641347465fc188fd:
>
> ======================================================
> [ INFO: possible circular locking dependency detected ]
> 4.10.0-next-20170301+ #1 Not tainted
> -------------------------------------------------------
> syz-executor1/3394 is trying to acquire lock:
> (sk_lock-AF_INET){+.+.+.}, at: [<ffffffff838864cc>] lock_sock
> include/net/sock.h:1460 [inline]
> (sk_lock-AF_INET){+.+.+.}, at: [<ffffffff838864cc>]
> do_ip_setsockopt.isra.12+0x21c/0x3540 net/ipv4/ip_sockglue.c:652
>
> but task is already holding lock:
> (rtnl_mutex){+.+.+.}, at: [<ffffffff836fbd97>] rtnl_lock+0x17/0x20
> net/core/rtnetlink.c:70
>
> which lock already depends on the new lock.
>
>
> the existing dependency chain (in reverse order) is:
>
> -> #1 (rtnl_mutex){+.+.+.}:
> validate_chain kernel/locking/lockdep.c:2265 [inline]
> __lock_acquire+0x2149/0x3430 kernel/locking/lockdep.c:3338
> lock_acquire+0x2a1/0x630 kernel/locking/lockdep.c:3753
> __mutex_lock_common kernel/locking/mutex.c:754 [inline]
> __mutex_lock+0x172/0x1730 kernel/locking/mutex.c:891
> mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:906
> rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
> mrtsock_destruct+0x86/0x2c0 net/ipv4/ipmr.c:1281
> ip_ra_control+0x459/0x600 net/ipv4/ip_sockglue.c:372
> do_ip_setsockopt.isra.12+0x1064/0x3540 net/ipv4/ip_sockglue.c:1161
> ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1264
> raw_setsockopt+0xb7/0xd0 net/ipv4/raw.c:839
> sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2725
> SYSC_setsockopt net/socket.c:1786 [inline]
> SyS_setsockopt+0x25c/0x390 net/socket.c:1765
> entry_SYSCALL_64_fastpath+0x1f/0xc2
>
> -> #0 (sk_lock-AF_INET){+.+.+.}:
> check_prev_add kernel/locking/lockdep.c:1828 [inline]
> check_prevs_add+0xa8f/0x19f0 kernel/locking/lockdep.c:1938
> validate_chain kernel/locking/lockdep.c:2265 [inline]
> __lock_acquire+0x2149/0x3430 kernel/locking/lockdep.c:3338
> lock_acquire+0x2a1/0x630 kernel/locking/lockdep.c:3753
> lock_sock_nested+0xcb/0x120 net/core/sock.c:2530
> lock_sock include/net/sock.h:1460 [inline]
> do_ip_setsockopt.isra.12+0x21c/0x3540 net/ipv4/ip_sockglue.c:652
> ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1264
> tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2721
> sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2725
> SYSC_setsockopt net/socket.c:1786 [inline]
> SyS_setsockopt+0x25c/0x390 net/socket.c:1765
> entry_SYSCALL_64_fastpath+0x1f/0xc2
>
Please try the attached patch (compile only).
Thanks.
View attachment "ip-router-alert.diff" of type "text/plain" (1627 bytes)
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