0x507de1 0x5e6b9e 0x5ef895 0x5efa87 0x61096f 0x6137f5 0x63ca8b 0x647a29 0x55ad12 0x66be20 0x337f6064a7 0x337ead3c2d 
 /opt/mongodb/bin/mongos(_ZN5mongo11msgassertedEiPKc+0x1e1) [0x507de1]
 /opt/mongodb/bin/mongos(_ZN5mongo5Chunk12moveIfShouldEN5boost10shared_ptrIS0_EE+0x5ee) [0x5e6b9e]
 /opt/mongodb/bin/mongos(_ZN5mongo5Chunk14_splitIfShouldEl+0xa05) [0x5ef895]
 /opt/mongodb/bin/mongos(_ZN5mongo5Chunk13splitIfShouldEl+0x27) [0x5efa87]
 /opt/mongodb/bin/mongos(_ZN5mongo13ShardStrategy7_insertERNS_7RequestERNS_9DbMessageEN5boost10shared_ptrINS_12ChunkManagerEEE+0x24f) [0x61096f]
 /opt/mongodb/bin/mongos(_ZN5mongo13ShardStrategy7writeOpEiRNS_7RequestE+0x295) [0x6137f5]
 /opt/mongodb/bin/mongos(_ZN5mongo7Request7processEi+0x16b) [0x63ca8b]
 /opt/mongodb/bin/mongos(_ZN5mongo21ShardedMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortE+0x149) [0x647a29]
 /opt/mongodb/bin/mongos(_ZN5mongo3pms9threadRunEPNS_13MessagingPortE+0x252) [0x55ad12]
 /opt/mongodb/bin/mongos(thread_proxy+0x80) [0x66be20]
 /lib64/libpthread.so.0 [0x337f6064a7]
 /lib64/libc.so.6(clone+0x6d) [0x337ead3c2d]
Traceback (most recent call last):
  File "bench.py", line 19, in ?
    id = conn[product][coll].insert(doc, safe=True)
  File "build/bdist.linux-x86_64/egg/pymongo/collection.py", line 232, in insert
  File "/usr/lib64/python2.4/site-packages/pymongo-1.7_-py2.4-linux-x86_64.egg/pymongo/connection.py", line 596, in _send_message
    return self.__check_response_to_last_error(response)
  File "/usr/lib64/python2.4/site-packages/pymongo-1.7_-py2.4-linux-x86_64.egg/pymongo/connection.py", line 565, in __check_response_to_last_error
    raise OperationFailure(error["err"], error["code"])
pymongo.errors.OperationFailure: moveAndCommit failed: db assertion failure { assertion: "SyncClusterConnection::findOne prepare failed: socket exception vm-tab...", assertionCode: 13104, errmsg: "db assertion failure", ok: 0.0 }