Comment 3 for bug 1550492

Observed in 2722 also

Backtrace
---------------
#0 strlen () at ../sysdeps/x86_64/strlen.S:106
#1 0x00007f0a7511cd35 in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#2 0x0000000000a7bd65 in OVSDB::LogicalSwitchTable::OvsdbMcastRemoteMacNotify(OVSDB::OvsdbClientIdl::Op, ovsdb_idl_row*) ()
#3 0x0000000000a91af9 in ?? ()
#4 0x0000000000a91e8a in ?? ()
#5 0x0000000000a90f6e in ?? ()
#6 0x0000000000a90e25 in ?? ()
#7 0x0000000000a90aac in ?? ()
#8 0x0000000000a902f3 in ovsdb_idl_msg_process ()
#9 0x0000000000a0d418 in OVSDB::OvsdbClientIdl::ProcessMessage(OVSDB::OvsdbClientIdl::OvsdbMsg*) ()
#10 0x0000000000a11e4f in QueueTaskRunner<OVSDB::OvsdbClientIdl::OvsdbMsg*, WorkQueue<OVSDB::OvsdbClientIdl::OvsdbMsg*> >::Run() ()
#11 0x0000000000f59a7c in TaskImpl::execute() ()
#12 0x00007f0a75385b3a in ?? () from /usr/lib/libtbb.so.2
#13 0x00007f0a75381816 in ?? () from /usr/lib/libtbb.so.2
#14 0x00007f0a75380f4b in ?? () from /usr/lib/libtbb.so.2
#15 0x00007f0a7537d0ff in ?? () from /usr/lib/libtbb.so.2
#16 0x00007f0a7537d2f9 in ?? () from /usr/lib/libtbb.so.2
#17 0x00007f0a755a1182 in start_thread (arg=0x7f0a6c637700) at pthread_create.c:312
#18 0x00007f0a7487a47d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111