Memcached constantly crashes (exit with139) on destination cluster, during xdcr replication from source cluster and one node on source is rebooted.

Setup:
-----------------
1. Setup unidirectional replication from source to destination cluster.
2. Loaded 2 M items on source, replicated 2M items to destination cluster.-ok.
3. Start mutating load on the source cluster [includes, expires/deletes on these mutations].
4. Reboot one node on the source cluster.
5. Items are being replicated as expected.
6. Node on source cluster is warmed up and source cluster looks healthy.

Output
-----------------
Memcached is crashing continuously on 1 node on desintaiotn cluster ( node 10.3.3.34)
Memcached crashed on other 2 nodes of the destination cluster.

Stack Trace from node 10.3.3.34
=----------------------------------------------
Thread 2 (Thread 1853):
#0 0x00007f106b18685c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1 0x00007f1067115a17 in SyncObject::wait (this=0x55b96c0) at syncobject.hh:36
#2 Dispatcher::run (this=0x55b96c0) at dispatcher.cc:89
#3 0x00007f106711600b in launch_dispatcher_thread (arg=0x55b9714) at dispatcher.cc:28
#4 0x00007f106b1819ca in start_thread () from /lib/libpthread.so.0
#5 0x00007f106aedecdd in clone () from /lib/libc.so.6
#6 0x0000000000000000 in ?? ()

Thread 1 (Thread 1852):
#0 std::string::length (db=<value optimized out>, docinfo=<value optimized out>, ctx=<value optimized out>)
at /usr/include/c++/4.4/bits/basic_string.h:630
#1 CouchKVStore::getMultiCb (db=<value optimized out>, docinfo=<value optimized out>, ctx=<value optimized out>)
at couch-kvstore/couch-kvstore.cc:1720
#2 0x00007f1066eda5e2 in lookup_callback (rq=<value optimized out>, k=<value optimized out>, v=<value optimized out>) at src/couch_db.c:583
#3 0x00007f1066ed9859 in btree_lookup_inner (rq=0x7f1065abe410, diskpos=<value optimized out>, current=22, end=26) at src/btree_read.c:73
#4 0x00007f1066ed975a in btree_lookup_inner (rq=0x7f1065abe410, diskpos=<value optimized out>, current=18, end=41) at src/btree_read.c:47
#5 0x00007f1066ed975a in btree_lookup_inner (rq=0x7f1065abe410, diskpos=<value optimized out>, current=0, end=121) at src/btree_read.c:47
#6 0x00007f1066edadb8 in iterate_docinfos (db=0x5572310, sequence=<value optimized out>, numDocs=121, options=<value optimized out>,
callback=<value optimized out>, ctx=<value optimized out>) at src/couch_db.c:688
#7 couchstore_docinfos_by_sequence (db=0x5572310, sequence=<value optimized out>, numDocs=121, options=<value optimized out>,
callback=<value optimized out>, ctx=<value optimized out>) at src/couch_db.c:729
#8 0x00007f10671b7d63 in CouchKVStore::getMulti (this=<value optimized out>, vb=343, itms=<value optimized out>)
at couch-kvstore/couch-kvstore.cc:464
#9 0x00007f10671b1896 in batchWarmupCallback (vbId=<value optimized out>, fetches=<value optimized out>, arg=0x7f1065abe840)
at couch-kvstore/couch-kvstore.cc:176
#10 0x00007f1067186de6 in MutationLogHarvester::apply (this=<value optimized out>, arg=<value optimized out>, mlc=<value optimized out>)
at mutation_log.cc:652
#11 0x00007f10671b2081 in CouchKVStore::warmup (this=<value optimized out>, lf=<value optimized out>, vbmap=<value optimized out>,
cb=<value optimized out>, estimate=<value optimized out>) at couch-kvstore/couch-kvstore.cc:1780
#12 0x00007f1067182480 in Warmup::loadingAccessLog (this=0x55740f0) at warmup.cc:458
#13 0x00007f1067183262 in Warmup::step (this=0x55740f0, d=..., t=<value optimized out>) at warmup.cc:554
#14 0x00007f1067184199 in WarmupStepper::callback(Dispatcher&, std::tr1::shared_ptr<Task>) () from /opt/couchbase/lib/memcached/ep.so
#15 0x00007f10671165cf in Task::run (this=<value optimized out>, d=..., t=<value optimized out>) at dispatcher.hh:139
#16 0x00007f10671157da in Dispatcher::run (this=0x55b9880) at dispatcher.cc:123
#17 0x00007f106711600b in launch_dispatcher_thread (arg=0x55dfcc0) at dispatcher.cc:28
#18 0x00007f106b1819ca in start_thread () from /lib/libpthread.so.0

Note : The core files on these nodes is at /opt/couchbase/var/lib/couchbase/

Please let me know if you need additional information.