Comment 2 for bug 1663169

See similar crashes in 3.2.B25 also
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/bin/contrail-vrouter-agent'.
Program terminated with signal SIGABRT, Aborted.
#0 0x00007f3de84e5c37 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
56 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0 0x00007f3de84e5c37 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007f3de84e9028 in __GI_abort () at abort.c:89
#2 0x00007f3de84debf6 in __assert_fail_base (fmt=0x7f3de862f3b8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x1353ad5 "0",
    file=file@entry=0x146ba00 "controller/src/base/task.cc", line=line@entry=291,
    function=function@entry=0x146d380 <TaskImpl::execute()::__PRETTY_FUNCTION__> "virtual tbb::task* TaskImpl::execute()") at assert.c:92
#3 0x00007f3de84deca2 in __GI___assert_fail (assertion=0x1353ad5 "0", file=0x146ba00 "controller/src/base/task.cc", line=291,
    function=0x146d380 <TaskImpl::execute()::__PRETTY_FUNCTION__> "virtual tbb::task* TaskImpl::execute()") at assert.c:101
#4 0x00000000012ff3c3 in TaskImpl::execute (this=<optimized out>) at controller/src/base/task.cc:291
#5 0x00007f3de90b4b3a in ?? () from /usr/lib/libtbb.so.2
#6 0x00007f3de90b0816 in ?? () from /usr/lib/libtbb.so.2
#7 0x00007f3de90aff4b in ?? () from /usr/lib/libtbb.so.2
#8 0x00007f3de90ac0ff in ?? () from /usr/lib/libtbb.so.2
#9 0x00007f3de90ac2f9 in ?? () from /usr/lib/libtbb.so.2
#10 0x00007f3de92d0184 in start_thread (arg=0x7f3dcbbfe700) at pthread_create.c:312
#11 0x00007f3de85a937d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111