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Operating System:
Linux
Steps To Reproduce:

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Launch mongo cluster under mongo user. Some db files will be created in data dir.
Change owner of data dirs (but not owner of files in it) to root on all mongo nodes.
Create any new index for db.
As a result all nodes will crash at same time since they cannot create _tmp dir in data dir.

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Launch mongo cluster under mongo user. Some db files will be created in data dir. Change owner of data dirs (but not owner of files in it) to root on all mongo nodes. Create any new index for db. As a result all nodes will crash at same time since they cannot create _tmp dir in data dir.
CAR Domain/s:
None

Database crashes when there is insufficient rights to create temporary _tmp directory for index creation.