$ mongodump --host xxxx --username xxxx --password xxx --collection xxx --db xxxx connected to: prodmongoperf-a.lan.flt DATABASE: locos_production to dump/locos_production locos_production.conversations.user_history.encounters to dump/locos_production/conversations.user_history.encounters.bson 12800/3595618 0% 32100/3595618 0% 50600/3595618 1% ^[ 69000/3595618 1% 86400/3595618 2% 103900/3595618 2% 127200/3595618 3% 144700/3595618 4% 162200/3595618 4% 179700/3595618 4% 197200/3595618 5% 214700/3595618 5% 238000/3595618 6% 255400/3595618 7% 278800/3595618 7% 290400/3595618 8% 302100/3595618 8% Tue Nov 15 16:23:21 Assertion: 13273:single data buffer expected 0x81b22f5 0x820fa68 0x8211c58 0x81ef9f8 0x81f007f 0x8707709 0x8708293 0x870c470 0x870e738 0x8701231 0x8706c99 0xb7447bd6 0x8128e91 mongodump(_ZN5mongo11msgassertedEiPKc+0x145) [0x81b22f5] mongodump(_ZN5mongo14DBClientCursor12dataReceivedERbRSs+0x198) [0x820fa68] mongodump(_ZN5mongo14DBClientCursor18exhaustReceiveMoreEv+0x178) [0x8211c58] mongodump(_ZN5mongo18DBClientConnection5queryEN5boost8functionIFvRNS_27DBClientCursorBatchIteratorEEEERKSsNS_5QueryEPKNS_7BSONObjEi+0x1d8) [0x81ef9f8] mongodump(_ZN5mongo18DBClientConnection5queryEN5boost8functionIFvRKNS_7BSONObjEEEERKSsNS_5QueryEPS4_i+0x43f) [0x81f007f] mongodump(_ZN4Dump12doCollectionESsP8_IO_FILEPN5mongo13ProgressMeterE+0x459) [0x8707709] mongodump(_ZN4Dump19writeCollectionFileESsN5boost10filesystem10basic_pathISsNS1_11path_traitsEEE+0x1b3) [0x8708293] mongodump(_ZN4Dump2goESsN5boost10filesystem10basic_pathISsNS1_11path_traitsEEE+0x480) [0x870c470] mongodump(_ZN4Dump3runEv+0x1b38) [0x870e738] mongodump(_ZN5mongo4Tool4mainEiPPc+0x1631) [0x8701231] mongodump(main+0x59) [0x8706c99] /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6) [0xb7447bd6] mongodump() [0x8128e91] assertion: 13273 single data buffer expected Tue Nov 15 16:23:21 Socket flush send() errno:9 Bad file descriptor 10.130.161.82:27017 Tue Nov 15 16:23:21 caught exception (socket exception) in destructor (~PiggyBackData)