Docs for SERVER-41035: Rollback should kill all user operations before taking RSTL lock in X.

Description

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Engineering Ticket Description:

Currently, there is a  3 way deadlock. Assume that we are transitioning from secondary to rollback.

• Thread A (Read thread)  acquires RSTL lock in IX and  blocked by a prepared txn due to prepare conflict.
• Rollback enqueues RSTL lock in X mode. And blocked behind A.
• Prepared txn won’t be able commit until we transition out of rollback.

Alternatively, thread A might have got blocked on prepared transaction due to conflicting DB/ collection lock. For eg. dbhash cmd.

EDIT: Blocked due to conflicting mongoDB locks  is not possible as secondary prepared txn yield mongoDB locks.

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