Saving new entries on multiple python processes (via pymongo 2.3), and get the error below. Has happened repeatedly, but not reproducibly.

Thu Oct 18 13:56:50 [initandlisten] connection accepted from 127.0.0.1:46942 #18413
(36 connections now open)
Thu Oct 18 13:56:50 [conn18413] end connection 127.0.0.1:46942 (35 connections now open)
Thu Oct 18 13:56:50 Invalid access at address: 0 from thread: journal

Thu Oct 18 13:56:50 Got signal: 11 (Segmentation fault).

Thu Oct 18 13:56:50 Backtrace:
0xade6e1 0x5582d9 0x558862 0x7fc0a4db1cb0 0x7fc0a411b0d0 0x583c30 0x5847f8 0x584b8c 0x6228ae 0x622c12 0xa0a30b 0xa0a70c 0xa0ae24 0x7c3659 0x7fc0a4da9e9a 0x7fc0a40bf4bd
mongod(_ZN5mongo15printStackTraceERSo+0x21) [0xade6e1]
mongod(_ZN5mongo10abruptQuitEi+0x399) [0x5582d9]
mongod(_ZN5mongo24abruptQuitWithAddrSignalEiP7siginfoPv+0x262) [0x558862]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xfcb0) [0x7fc0a4db1cb0]
/lib/x86_64-linux-gnu/libc.so.6(+0x14e0d0) [0x7fc0a411b0d0]
mongod(_ZN6snappy8internal16CompressFragmentEPKcmPcPti+0x300) [0x583c30]
mongod(_ZN6snappy8CompressEPNS_6SourceEPNS_4SinkE+0x158) [0x5847f8]
mongod(_ZN6snappy11RawCompressEPKcmPcPm+0x5c) [0x584b8c]
mongod(_ZN5mongo3dur7Journal7journalERKNS0_11JSectHeaderERKNS_14AlignedBuilderE+0xae) [0x6228ae]
mongod(_ZN5mongo3dur14WRITETOJOURNALENS0_11JSectHeaderERNS_14AlignedBuilderE+0x32) [0x622c12]
mongod() [0xa0a30b]
mongod() [0xa0a70c]
mongod(_ZN5mongo3dur9durThreadEv+0x364) [0xa0ae24]
mongod() [0x7c3659]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a) [0x7fc0a4da9e9a]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7fc0a40bf4bd]