Hi
I have written a small asynchronous gRPC server, but sometimes I get a
strange *memory access violation* inside gRPC code after finishing a
request. I get the exception in **AsyncNextInternal**:
CompletionQueue::NextStatus CompletionQueue::AsyncNextInternal(
void** tag, bool* ok, gpr_timespec deadline) {
for (;;) {
auto ev = grpc_completion_queue_next(cq_, deadline, nullptr);
switch (ev.type) {
case GRPC_QUEUE_TIMEOUT:
return TIMEOUT;
case GRPC_QUEUE_SHUTDOWN:
return SHUTDOWN;
case GRPC_OP_COMPLETE:
auto core_cq_tag =
static_cast<::grpc::internal::CompletionQueueTag*>(ev.tag);
*ok = ev.success != 0;
*tag = core_cq_tag;
if (core_cq_tag->FinalizeResult(tag, ok)) { // <<-- Here
return GOT_EVENT;
}
break;
}
}
}
It happens because *core_cq_tag* will be a dangling pointer and
dereferencing this pointer for calling *FinalizeResult()* creates a memory
access violation. This this is an internal pointer and not what I provide
as tag, any idea why this may happen? I'm using gRPC 1.27.3 and I have both
*Alarm
*and *AsyncNotifyWhenDone()* registered for my connection info and I delete
my own corresponding data when *AsyncNotifyWhenDone()* callback is called.
As an additional question, what happens if a CompletionQueue is shutdown
before a registered alarm expires? will this alarm be ignored or be
delivered?
Best Regards
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