netdev - Re: unregister_netdevice: waiting for DEV to become free

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Date:   Fri, 20 Apr 2018 16:59:02 -0700
From:   syzbot <syzbot+2dfb68e639f0621b19fb@...kaller.appspotmail.com>
To:     ddstreet@...e.org, dvyukov@...gle.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: unregister_netdevice: waiting for DEV to become free

syzbot has found reproducer for the following crash on  
https://github.com/google/kmsan.git/master commit
48c6a2b0ab1b752451cdc40b5392471ed1a2a329 (Mon Apr 16 08:42:26 2018 +0000)
mm/kmsan: fix origin calculation in kmsan_internal_check_memory
syzbot dashboard link:  
https://syzkaller.appspot.com/bug?extid=2dfb68e639f0621b19fb

So far this crash happened 180 times on  
https://github.com/google/kmsan.git/master, net-next, upstream.
C reproducer: https://syzkaller.appspot.com/x/repro.c?id=4936564132020224
syzkaller reproducer:  
https://syzkaller.appspot.com/x/repro.syz?id=5817131010621440
Raw console output:  
https://syzkaller.appspot.com/x/log.txt?id=6313498770407424
Kernel config:  
https://syzkaller.appspot.com/x/.config?id=6627248707860932248
compiler: clang version 7.0.0 (trunk 329391)

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+2dfb68e639f0621b19fb@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed.

IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
device bridge_slave_1 left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
device bridge_slave_0 left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
unregister_netdevice: waiting for lo to become free. Usage count = 3