I have a mongodb instance that seems to crash roughly once a day. I don't see any useful information in the mongo log file. All is well and then the process is just crashed with no additional information logged. I ran it under strace in hopes of getting some useful clues until it crashed and got this output:
Wed Apr 17 10:56:39.340 [conn172] M/R: (1/3) Emit Progress: 2800/4351 64% Wed Apr 17 10:57:16.696 [PeriodicTask::Runner] task: DBConnectionPool-cleaner took: 16ms Wed Apr 17 10:57:17.035 [PeriodicTask::Runner] task: WriteBackManager::cleaner took: 17ms Wed Apr 17 10:57:17.429 [PeriodicTask::Runner] task: DBConnectionPool-cleaner took: 79ms +++ killed by SIGKILL +++
This is only happening on one specific VM and the rest are fine. Also checked hourly/daily cron jobs in case something was going haywire and killing mongod but no suspects there.
OS: Ubuntu 12.04.2
Anything else I can do to further troubleshoot?