Possible races while Service destruction
----------------------------------------
Key: CORE-4303
URL: http://tracker.firebirdsql.org/browse/CORE-4303
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 3.0 Alpha 1, 2.5.2 Update 1, 2.5.3, 3.0 Alpha 2
Reporter: Roman Simakov
This destructor sometimes is called concurrently with existing
Service::ExistenceGuard object in another thread
Service::~Service()
{
removeFromAllServices();
delete svc_trace_manager;
svc_trace_manager = NULL;
if (svc_current_guard)
{
svc_current_guard->release();
}
}
Variable svc_current_guard is not null exactly in such moment. But after check
another thread with ExistenceGuard can continue its work and ExistenceGuard
object will be destroyed and svc_current_guard will be released. In this case
~Service will try to leave svc->svc_existence_lock the second time which leads
to abort.
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