PengZheng opened a new issue, #595:
URL: https://github.com/apache/celix/issues/595
When eliminating GOTOs in `discovery_zeroconf`, we found replace the
following `celix_bundleContext_stopTrackerAsync` plus
`celix_bundleContext_stopTrackerAsync` by `celix_bundleContext_stop` will
caused ASAN error in `TEST_F(DiscoveryZeroconfWatcherTestSuite,
CreateWatcherFailed4)`.
The difference between the two procedures is that the latter may cancel a
tracker while the former will never try to cancel a in-flight tracker. A closer
look at service tracker creation reveals that a cancelled tracker will be
created and destroyed:
```C
static void celix_bundleContext_createTrackerOnEventLoop(void *data) {
celix_bundle_context_service_tracker_entry_t* entry = data;
assert(celix_framework_isCurrentThreadTheEventLoop(entry->ctx->framework));
celixThreadMutex_lock(&entry->ctx->mutex);
bool cancelled = entry->cancelled;
celixThreadMutex_unlock(&entry->ctx->mutex);
if (cancelled) {
fw_log(entry->ctx->framework->logger, CELIX_LOG_LEVEL_DEBUG,
"Creating of service tracker was cancelled. trk id = %li, svc name tracked =
%s", entry->trackerId, entry->opts.filter.serviceName);
} else {
celix_service_tracker_t *tracker =
celix_serviceTracker_createWithOptions(entry->ctx, &entry->opts);
if (tracker != NULL) {
celixThreadMutex_lock(&entry->ctx->mutex);
// double-check is necessary to eliminate first-check-then-do
race condition
if(!entry->cancelled) {
entry->tracker = tracker;
}
celixThreadMutex_unlock(&entry->ctx->mutex);
if(entry->tracker == NULL) {
assert(entry->cancelled);
celix_serviceTracker_destroy(tracker);
}
} else {
fw_log(entry->ctx->framework->logger, CELIX_LOG_LEVEL_ERROR,
"Cannot create tracker for bnd %s (%li)",
celix_bundle_getSymbolicName(entry->ctx->bundle),
celix_bundle_getId(entry->ctx->bundle));
}
}
}
```
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