We are in the process of upgrading our MongoDB clients from 1.0.0 to 1.4.1, and started getting segfaults when using the ScopedDbConnection. Eventually I found out it had to do with boost::program_options ,- see attachment for reproducible test case.

Output on my machine:

$ ./test 172.16.1.12,172.16.1.15
1
2
3
1
Segmentation fault (core dumped)

(gdb) thread apply all bt

Thread 2 (process 8803):
#0 0x0000003d8380dfe1 in nanosleep () from /lib64/libpthread.so.0
#1 0x0000000000480534 in mongo::BackgroundJob::go (this=0x7fff69f072f0) at ./util/goodies.h:225
#2 0x0000000000479312 in mongo::MessagingPort::connect (this=0x1d9f7c80, _far=<value optimized out>) at util/message.cpp:230
#3 0x000000000045dbf1 in mongo::DBClientConnection::connect (this=0x1d9f7bd0, _serverAddress=<value optimized out>, errmsg=@0x7fff69f075f0) at client/dbclient.cpp:464
#4 0x000000000045df0d in mongo::DBClientPaired::connect (this=0x1d9f7af0, serverHostname1=<value optimized out>, serverHostname2=@0x7fff69f07630) at client/dbclient.cpp:944
#5 0x000000000045e035 in mongo::DBClientPaired::connect (this=0x1d9f7af0, hostpairstring=@0x7fff69f077b0) at client/dbclient.cpp:960
#6 0x0000000000452922 in mongo::DBConnectionPool::get (this=0x6a5180, host=@0x7fff69f07a30) at client/connpool.cpp:54
#7 0x000000000041a69e in ScopedDbConnection (this=0x7fff69f079b0, _host=@0x7fff69f07a30) at /opt/mongodb/include/mongo/client/connpool.h:95
#8 0x00000000004137da in main (argc=2, argv=0x7fff69f07b58) at testcase.cpp:43

Thread 1 (process 8809):
#0 0x00002b9e3362709e in tls_destructor () from /usr/local/lib/libboost_thread.so.1.40.0
#1 0x00002b9e33627203 in thread_proxy () from /usr/local/lib/libboost_thread.so.1.40.0
#2 0x0000003d83806617 in start_thread () from /lib64/libpthread.so.0
#3 0x0000003d830d3c2d in clone () from /lib64/libc.so.6
(gdb)