Comment 6 for bug 1390594

this issue is seen at R2.11.1 -15
[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 0x00007fd6dc542cc9 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 0x00007fd6dc542cc9 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007fd6dc5460d8 in __GI_abort () at abort.c:89
#2 0x00007fd6dc53bb86 in __assert_fail_base (fmt=0x7fd6dc68c830 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x1019f75 "0",
    file=file@entry=0x10e7951 "controller/src/base/task.cc", line=line@entry=253,
    function=function@entry=0x10e9000 "virtual tbb::task* TaskImpl::execute()") at assert.c:92
#3 0x00007fd6dc53bc32 in __GI___assert_fail (assertion=0x1019f75 "0", file=0x10e7951 "controller/src/base/task.cc", line=253,
    function=0x10e9000 "virtual tbb::task* TaskImpl::execute()") at assert.c:101
#4 0x0000000000fdd9f3 in TaskImpl::execute() ()
#5 0x00007fd6dd111b3a in ?? () from /usr/lib/libtbb.so.2
#6 0x00007fd6dd10d816 in ?? () from /usr/lib/libtbb.so.2
#7 0x00007fd6dd10cf4b in ?? () from /usr/lib/libtbb.so.2
#8 0x00007fd6dd1090ff in ?? () from /usr/lib/libtbb.so.2
#9 0x00007fd6dd1092f9 in ?? () from /usr/lib/libtbb.so.2
#10 0x00007fd6dd32d182 in start_thread (arg=0x7fd6d4fc6700) at pthread_create.c:312
#11 0x00007fd6dc60647d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111