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Date: Mon, 13 Aug 2018 23:39:43 +0800
From: Xin Long <lucien.xin@...il.com>
To: syzbot <syzbot+a8371264572a6872b8a3@...kaller.appspotmail.com>
Cc: Christian Brauner <christian.brauner@...ntu.com>,
davem <davem@...emloft.net>, David Ahern <dsahern@...il.com>,
Florian Westphal <fw@...len.de>, Jiri Benc <jbenc@...hat.com>,
Kirill Tkhai <ktkhai@...tuozzo.com>,
LKML <linux-kernel@...r.kernel.org>,
network dev <netdev@...r.kernel.org>,
Nicolas Dichtel <nicolas.dichtel@...nd.com>,
syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
Moni Shoua <monis@...lanox.com>
Subject: Re: possible deadlock in flush_work (3)
On Mon, Aug 13, 2018 at 8:35 PM, syzbot
<syzbot+a8371264572a6872b8a3@...kaller.appspotmail.com> wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: d6dd6431591b Merge branch 'fixes' of git://git.kernel.org/..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=14e800aa400000
> kernel config: https://syzkaller.appspot.com/x/.config?x=152cb8ccd35b1f70
> dashboard link: https://syzkaller.appspot.com/bug?extid=a8371264572a6872b8a3
> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+a8371264572a6872b8a3@...kaller.appspotmail.com
>
> 8021q: adding VLAN 0 to HW filter on device bond0
>
> ======================================================
> WARNING: possible circular locking dependency detected
> 4.18.0-rc8+ #185 Not tainted
> ------------------------------------------------------
> syz-executor2/6421 is trying to acquire lock:
> 00000000209b4e4b ((wq_completion)bond_dev->name){+.+.}, at: start_flush_work
> kernel/workqueue.c:2888 [inline]
> 00000000209b4e4b ((wq_completion)bond_dev->name){+.+.}, at:
> flush_work+0x4b8/0x900 kernel/workqueue.c:2917
>
> but task is already holding lock:
> 00000000f0f3d47a (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20
> net/core/rtnetlink.c:77
>
> which lock already depends on the new lock.
>
>
> the existing dependency chain (in reverse order) is:
>
> -> #2 (rtnl_mutex){+.+.}:
> __mutex_lock_common kernel/locking/mutex.c:757 [inline]
> __mutex_lock+0x176/0x1820 kernel/locking/mutex.c:894
> mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909
> rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77
> bond_netdev_notify drivers/net/bonding/bond_main.c:1310 [inline]
> bond_netdev_notify_work+0x44/0xd0
> drivers/net/bonding/bond_main.c:1320
> process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
> worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
> kthread+0x345/0x410 kernel/kthread.c:246
> ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
>
> -> #1 ((work_completion)(&(&nnw->work)->work)){+.+.}:
> process_one_work+0xc0b/0x1ba0 kernel/workqueue.c:2129
> worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
> kthread+0x345/0x410 kernel/kthread.c:246
> ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
>
> -> #0 ((wq_completion)bond_dev->name){+.+.}:
> lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924
> start_flush_work kernel/workqueue.c:2889 [inline]
> flush_work+0x4dd/0x900 kernel/workqueue.c:2917
> __cancel_work_timer+0x4bd/0x830 kernel/workqueue.c:2989
> cancel_delayed_work_sync+0x1a/0x20 kernel/workqueue.c:3121
> bond_work_cancel_all drivers/net/bonding/bond_main.c:3318 [inline]
> bond_close+0x1b/0x130 drivers/net/bonding/bond_main.c:3381
> __dev_close_many+0x21e/0x380 net/core/dev.c:1476
> __dev_close net/core/dev.c:1488 [inline]
> __dev_change_flags+0x38d/0x9c0 net/core/dev.c:6989
> dev_change_flags+0x89/0x150 net/core/dev.c:7060
> dev_ifsioc+0x84f/0xb30 net/core/dev_ioctl.c:237
> dev_ioctl+0x1b5/0xcc0 net/core/dev_ioctl.c:493
> sock_do_ioctl+0x1d3/0x3e0 net/socket.c:993
> sock_ioctl+0x30d/0x680 net/socket.c:1094
> vfs_ioctl fs/ioctl.c:46 [inline]
> file_ioctl fs/ioctl.c:500 [inline]
> do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684
> ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
> __do_sys_ioctl fs/ioctl.c:708 [inline]
> __se_sys_ioctl fs/ioctl.c:706 [inline]
> __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706
> do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
>
> other info that might help us debug this:
>
> Chain exists of:
> (wq_completion)bond_dev->name --> (work_completion)(&(&nnw->work)->work)
> --> rtnl_mutex
>
> Possible unsafe locking scenario:
>
> CPU0 CPU1
> ---- ----
> lock(rtnl_mutex);
> lock((work_completion)(&(&nnw->work)->work));
> lock(rtnl_mutex);
> lock((wq_completion)bond_dev->name);
nnw->work is queuing up into bond->wq, so it seems bond_netdev_notify()
should have used rtnl_trylock() instead of rtnl_lock(), as do other
delayed_work handlers in bond->wq.
>
> *** DEADLOCK ***
>
> 1 lock held by syz-executor2/6421:
> #0: 00000000f0f3d47a (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20
> net/core/rtnetlink.c:77
>
> stack backtrace:
> CPU: 0 PID: 6421 Comm: syz-executor2 Not tainted 4.18.0-rc8+ #185
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
> print_circular_bug.isra.36.cold.57+0x1bd/0x27d
> kernel/locking/lockdep.c:1227
> check_prev_add kernel/locking/lockdep.c:1867 [inline]
> check_prevs_add kernel/locking/lockdep.c:1980 [inline]
> validate_chain kernel/locking/lockdep.c:2421 [inline]
> __lock_acquire+0x3449/0x5020 kernel/locking/lockdep.c:3435
> lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924
> start_flush_work kernel/workqueue.c:2889 [inline]
> flush_work+0x4dd/0x900 kernel/workqueue.c:2917
> __cancel_work_timer+0x4bd/0x830 kernel/workqueue.c:2989
> cancel_delayed_work_sync+0x1a/0x20 kernel/workqueue.c:3121
> bond_work_cancel_all drivers/net/bonding/bond_main.c:3318 [inline]
> bond_close+0x1b/0x130 drivers/net/bonding/bond_main.c:3381
> __dev_close_many+0x21e/0x380 net/core/dev.c:1476
> __dev_close net/core/dev.c:1488 [inline]
> __dev_change_flags+0x38d/0x9c0 net/core/dev.c:6989
> dev_change_flags+0x89/0x150 net/core/dev.c:7060
> dev_ifsioc+0x84f/0xb30 net/core/dev_ioctl.c:237
> dev_ioctl+0x1b5/0xcc0 net/core/dev_ioctl.c:493
> sock_do_ioctl+0x1d3/0x3e0 net/socket.c:993
> kernel msg: ebtables bug: please report to author: Wrong nr of counters
> sock_ioctl+0x30d/0x680 net/socket.c:1094
> vfs_ioctl fs/ioctl.c:46 [inline]
> file_ioctl fs/ioctl.c:500 [inline]
> do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684
> ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
> __do_sys_ioctl fs/ioctl.c:708 [inline]
> __se_sys_ioctl fs/ioctl.c:706 [inline]
> __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706
> do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x457089
> Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
> 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff
> 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007fee7b2ccc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007fee7b2cd6d4 RCX: 0000000000457089
> RDX: 0000000020000140 RSI: 0000000000008914 RDI: 0000000000000004
> RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
> R13: 00000000004d19e0 R14: 00000000004c7454 R15: 0000000000000000
> 8021q: adding VLAN 0 to HW filter on device bond0
> (unnamed net_device) (uninitialized): option miimon: invalid value
> (18446744073709551615)
> (unnamed net_device) (uninitialized): option miimon: allowed values 0 -
> 2147483647
> (unnamed net_device) (uninitialized): option miimon: invalid value
> (18446744073709551615)
> (unnamed net_device) (uninitialized): option miimon: allowed values 0 -
> 2147483647
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> device bond0 left promiscuous mode
> IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
> 8021q: adding VLAN 0 to HW filter on device bond0
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
> syzbot.
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