title: MongoDB crashes with signal 6
body: <pre><code>    Tue Apr  1 17:21:38.898 [initandlisten] connection accepted from 127.0.0.1:58349 #42 (5 connections now open)
  Tue Apr  1 17:21:50.855 [journal] exception in dur::groupCommitLL causing immediate shutdown: boost::filesystem::current_path: Too many open files in system
  Tue Apr  1 17:21:50.855 dur4
  Tue Apr  1 17:21:50.855 Got signal: 6 (Abort trap: 6).
  
  Tue Apr  1 17:21:50.858 Backtrace:
  0x100447d8b 0x100001531 0x7fff9225990a 0x104e80818 0x7fff922b0f61 0x1001e462a 0x10016dc3c 0x10016d537 0x10047a8b5 0x7fff9226b772 0x7fff922581a1 
   0   mongod                              0x0000000100447d8b _ZN5mongo15printStackTraceERSo + 43
   1   mongod                              0x0000000100001531 _ZN5mongo10abruptQuitEi + 225
   2   libsystem_c.dylib                   0x00007fff9225990a _sigtramp + 26
   3   ???                                 0x0000000104e80818 0x0 + 4377282584
   4   libsystem_c.dylib                   0x00007fff922b0f61 abort + 143
   5   mongod                              0x00000001001e462a _ZN5mongo10mongoAbortEPKc + 90
   6   mongod                              0x000000010016dc3c _ZN5mongo3dur27groupCommitWithLimitedLocksEv + 1052
   7   mongod                              0x000000010016d537 _ZN5mongo3dur9durThreadEv + 583
   8   mongod                              0x000000010047a8b5 thread_proxy + 229
   9   libsystem_c.dylib                   0x00007fff9226b772 _pthread_start + 327
   10  libsystem_c.dylib                   0x00007fff922581a1 thread_start + 13
  </code></pre>
  
  <p>Would anyone know what is causing mongo to crash? If you need more context please comment - I'll see what else I can dig up.</p>