Deadlock when executing multiple select statements from multiple threads

Hello,

We are having a deadlock issue when executing multiple select statements from multiple threads, the issue happens with driver version (9.6.4.0) or newer, doesn't happen on 9.6.3.1 .
I've attached a simple project that triggers the deadlock, tested with visual studio 2017, release x64 build, PostgreSQL 10.3, usually happens after few runs.[please note that the proper database connection string and the table names need to be provided in the code for it to work].
I've also included the stack trace of the two threads in deadlock.

Regards,
Ayman

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