1. Create 1GB ramdisk: diskutil erasevolume HFS+ 'RAM Disk' `hdiutil attach -nomount ram://2000000` 2. start mongod with wiredTiger (default setting, except dbpath) 3. create some random 100MB binary files with: dd if=/dev/urandom of=file bs=1048576 count=100 4. insert them using mongofiles until disk is full and the server crashes 5. run df to determine the amount of free space left on the ramdisk 6. run: dd if=/dev/urandom of=file bs=xxxxx count=1 in the ramdisk directory, where bs= the free space from step 5. This should fill up the ramdisk completely. 7. restart the server and connect mongo 8. segmentation fault 11 stack trace is attached