[PROTON-2239] epoll proactor race condition on connection teardown with heartbeats

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: proton-c-0.28.0
• Component/s: proton-c
• Assignee: Clifford Jansen
• Reporter: Clifford Jansen
• Created: 04/Jun/20 14:43
• Updated: 07/Jul/20 14:43

Description

If a connection with heartbeats is closed at about the same time to when its idle timeout timer fires, it is possible to have two threads believing they are the last activity on the connection. Both threads proceed to free the same resources leading to memory corruption and various crashes.

The existing code has guards for this exact situation, but there is an Achilles heel somewhere.