[system test] tcmalloc segfault

Cluster: 7 nodes
10.6.2.37
10.6.2.38
10.6.2.39
10.6.2.40
10.6.2.42
10.6.2.43
10.6.2.44

Node will be added:
10.6.2.45

Build # 2.0.0-1945
Environment: 8 nodes with 390GB SSD drive, 32GB RAM
Bucket: 1 default bucket (1 replica), disable replica index.
Number of clients: 1

Load 40 million items to default bucket that push resident ratio down to around 62%
Maintain load about 600 ops and 600 queries per second
Create 1 design doc with 8 views. Let the initial index completed.
Then add node 45 to cluster and rebalance.
Rebalance was done at 01:35:40 - Friday Nov 9, 2012.

Then at 07:19:06 - Fri Nov 9, 2012, control connection to memcached on node 42 was disconnected.
Generate memcached backtrace on node 42, got error

Reading symbols from /lib64/libnss_files.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libnss_files.so.2
Core was generated by `/opt/couchbase/bin/memcached -X /opt/couchbase/lib/memcached/stdin_term_handler'.
Program terminated with signal 11, Segmentation fault.
#0 0x00007fb8600f3d03 in tcmalloc::CentralFreeList::FetchFromSpans() ()
from /opt/couchbase/lib/libtcmalloc_minimal.so.4
Missing separate debuginfos, use: debuginfo-install couchbase-server-2.0.0-1945.x86_64

This bug looks similar to bug MB-5179

Link to manifest file http://builds.hq.northscale.net/latestbuilds/couchbase-server-enterprise_x86_64_2.0.0-1945-rel.rpm.manifest.xml

Link to memcached stack trace https://friendpaste.com/mhLCkxtmbXmmO0t3ZtQkV

Link to collect info of all nodes https://s3.amazonaws.com/packages.couchbase/collect_info/orange/2_0_0/201211/8nodes-ci-1945-tcmalloc-segfault-20121109-120057.tgz