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Vouchers can be used past their usage limit under concurrent access #544
When two customers check out concurrently using a voucher that has a usage limit of one, the voucher can be used twice.
Steps to reproduce:
We have reproduced this behavior on a single machine, by performing the above steps with one customer in one browser window and another customer in a second browser window.
Because this bug depends on concurrent execution, it may be helpful to introduce additional delay between the server and database. If connecting to the database using unix sockets, the following script can act as a proxy that delays packets: