[R2.20 Build 21] TOR Agent crash @ EvpnRouteEntry::~EvpnRouteEntry

[chhandak]

Ovserved this crash on scale setup. No specific trigger applied.

Backtrace
-----------------
(gdb) bt
#0 0x00007fd1fdb708fd in malloc_consolidate (av=av@entry=0x7fd180000020) at malloc.c:4157
#1 0x00007fd1fdb7156d in _int_free (av=0x7fd180000020, p=<optimized out>, have_lock=0) at malloc.c:4057
#2 0x000000000118edf6 in EvpnRouteEntry::~EvpnRouteEntry (this=0x7fd182be1720, __in_chrg=<optimized out>) at controller/src/vnsw/agent/oper/evpn_route.h:99
#3 0x00000000017ccb0e in DBTablePartition::Remove (this=0x7fd1a01f3570, db_entry=0x7fd182be1720) at controller/src/db/db_table_partition.cc:118
#4 0x00000000017cc4ad in DBTablePartBase::RunNotify (this=0x7fd1a01f3570) at controller/src/db/db_table_partition.cc:59
#5 0x00000000017c3406 in DBPartition::QueueRunner::Run (this=0x7fd1a5e07430) at controller/src/db/db_partition.cc:199
#6 0x000000000191f872 in TaskImpl::execute (this=0x7fd1f736da40) at controller/src/base/task.cc:232
#7 0x00007fd1fe6f7b3a in ?? () from /usr/lib/libtbb.so.2
#8 0x00007fd1fe6f3816 in ?? () from /usr/lib/libtbb.so.2
#9 0x00007fd1fe6f2f4b in ?? () from /usr/lib/libtbb.so.2
#10 0x00007fd1fe6ef0ff in ?? () from /usr/lib/libtbb.so.2
#11 0x00007fd1fe6ef2f9 in ?? () from /usr/lib/libtbb.so.2
#12 0x00007fd1fe913182 in start_thread (arg=0x7fd1f71af700) at pthread_create.c:312
#13 0x00007fd1fdbec47d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Setup
----------
env.roledefs = {
    'all': [host1, host2, host3, host4, host5, host6],
    'cfgm': [host1, host2, host3],
    'openstack': [host1, host2, host3],
    'webui': [host2],
    'control': [host1, host3],
    'compute': [host4, host5, host6],
    'tsn': [host4, host5],
    'toragent': [host4, host5],
    'collector': [host1, host3],
    'database': [host1, host2, host3],
    'build': [host_build],
}

env.hostnames = {
    'all': ['nodei6', 'nodei7', 'nodei8', 'nodei9', 'nodei10', 'nodei19']
}

[chhandak (chhandak)]

Logs saved at http://mayamruga.englab.juniper.net/bugs/1456913