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Race Condition Examples draft-hasebe-sipping-race-examples-00.txt Miki Hasebe NTT-east Corporation

Race Condition Examples draft-hasebe-sipping-race-examples-00.txt Miki Hasebe NTT-east Corporation. Changes from the previous draft. Represented a basic idea to explain race conditions Made a figure of the dialog state transition to reveal the underlying structure of race conditions.

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Race Condition Examples draft-hasebe-sipping-race-examples-00.txt Miki Hasebe NTT-east Corporation

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  1. Race Condition Examples draft-hasebe-sipping-race-examples-00.txt Miki Hasebe NTT-east Corporation

  2. Changes from the previous draft • Represented a basic idea to explain race conditions • Made a figure of the dialog state transition to reveal the underlying structure of race conditions. • Organize and reclassify examples in race condition • Examples in the previous draft is organized into categories based on the figure of dialog state transition.

  3. The dialog state transition in race conditions • A race condition is generated in a situation where the dialog state differs between UAC and UAS. Alice Bob INVITE 180 Early Early 200 CANCEL Confirmed Confirmed ACK BYE Terminated Terminated 200

  4. Dialog State Machine • This figure is based on the RFC4235(dialog event package) Preparative 3xx-6xx 2xx Trying 1xx no-tag 1xx with tag Proceeding 1xx no-tag 3xx-6xx Early BYE 1xx with tag 2xx Terminated Confirmed Mortal Moratorium BYE 2xx BYE Timeout ACK Morgue Established

  5. The classification of Examples 3. Race condition 3.1 Receiving message in the Moratorium State 3.1.1 Receiving Initial INVITE retransmission(Trying state) 3.1.2 Receiving CANCEL(Trying state) 3.1.3 Receiving CANCEL(Trying state) via a stateful proxy 3.1.4 Receiving BYE (Early state) 3.1.5 Receiving re-INVITE (Established state) 3.1.6 Receiving BYE (Established state) 3.2 Receiving message in the Mortal State 3.2.1 Receiving BYE(Established state) 3.2.2 Receiving re-INVITE(Established state) 3.2.3 Receiving REFER(Established state) 3.2.4 Receiving 200OK for re-INVITE(Established state) 3.2.5 Receiving ACK (Moratorium state) 3.3 other race condition

  6. Open issues • Let me hear your candid opinion of my proposal. • The idea of causing race conditions arising from the dialog state transition. • Classification of examples based on that idea. Proposal • I hope to promote discussions on the draft as a WG item.

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