[Rails] DeadLock ... Help Please

Please help me... Thank you before...

 Saya nguji transaksi antar 2 proses

 ini kodenya : http://pastie.org/195869 di TestEnvironment

 ini kode di active Recordnya yang pembentukan penguncian :
 http://pastie.org/195875

 Nah permasalahannya : saat 2 transaksi berjalan hampir bersamaan, kok Transaksi 1 dan Transaksi 2 sama2
menjalankan penguncian exclusive. Seharusnya kan klo salah satu diambil salah satunya waitting.

 ini lognya http://pastie.org/195865

 baris 16 - 21 di Log : Transaksi 1 Mengambil Penguncian Ekslusive
 Barius 50 - 55 di Log : Transaksi 2 Mengambil Penguncian Ekslusive padahal belum di lepas oleh Transaksi 1
 Sehingga Baris 83-89 di Log : Transaksi 2 mengalami DeadLock
 Pertanyaan Saya kenapa Transaksi 2 bisa mengambil penguncian ekslusive yang belum dilepas oleh
Transaksi 1

Thank You,
Reinhart

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