Comment 34 for bug 1664302

Ok, I may see what is happening. Even with my changes, in ~cac the msgForMultiplyDefinedPV are removed from the msgMultiPVList list before their destructor is called (where dnsTransaction.release() happens). So pvMultiplyDefinedNotify() may already be queued and run after removal from the list, but before release(). This will blindly try to remove() again, which causes the crash.

I think the fix will be to track whether an msgForMultiplyDefinedPV is in the list.