We run into a deadlock issue over Microsoft.ApplicationInsights.EventSourceListener.EventSourceTelemetryModule.OnEventSourceCreated() function.

0:013> !critlist
CritSec at 000000acea379ae0. Owned by thread 13.
Waiting Threads: 10 12 15 16 27 28
so, the multiple threads hang on thread# 13.

0:013> !locks
CritSec +ea379ae0 at 000000acea379ae0
WaiterWoken No
LockCount 6
RecursionCount 1
OwningThread 868
EntryCount 0
ContentionCount 6

0:013> ~~[0x868]
. 13 Id: 1700.868 Suspend: 0 Teb: 00007ff5ff014000 Unfrozen Start: clr!Thread::intermediateThreadProc (00007ff86b57598c)
Priority: 0 Priority class: 32 Affinity: 3

Thread # 13 and Thread# 17 are deadlock on each other

Thread 17 takes a lock on the TelmetryModule
Thread 17 then takes a lock on EventListenersLock

Thread 13 takes a lock on EventListenersLock
Thread 13 then takes a lock on the TelmetryModule

Thread 13
000000ac829ace78 00007ff8749e0c6a [HelperMethodFrame_1OBJ: 000000ac829ace78] System.Threading.Monitor.Enter(System.Object) << Locks on Microsoft.ApplicationInsights.EventSourceListener.EventSourceTelemetryModule
000000ac829acf70 00007ff80c9788fd Microsoft.ApplicationInsights.EventSourceListener.EventSourceTelemetryModule.OnEventSourceCreated(System.Diagnostics.Tracing.EventSource)
000000ac829acfc0 00007ff86a12bc27 System.Diagnostics.Tracing.EventSource.AddListener(System.Diagnostics.Tracing.EventListener)
000000ac829ad030 00007ff86a1d40ca System.Diagnostics.Tracing.EventListener.AddEventSource(System.Diagnostics.Tracing.EventSource)
000000ac829ad0a0 00007ff86a1d341d System.Diagnostics.Tracing.EventSource.Initialize(System.Guid, System.String, System.String[]) << Locks on EventListener.EventListenersLock
000000ac829ad130 00007ff86a13260f System.Diagnostics.Tracing.EventSource..ctor(System.Diagnostics.Tracing.EventSourceSettings, System.String[])

Thread 17
000000ac8a20e068 00007ff8749e0c6a [HelperMethodFrame_1OBJ: 000000ac8a20e068] System.Threading.Monitor.Enter(System.Object) << Locks on EventListener.EventListenersLock
000000ac8a20e160 00007ff86a9f440c System.Diagnostics.Tracing.EventSource.SendCommand(System.Diagnostics.Tracing.EventListener, Int32, Int32, System.Diagnostics.Tracing.EventCommand, Boolean, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords, System.Collections.Generic.IDictionary2) 000000ac8a20e1e0 00007ff86a1a72d7 System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords, System.Collections.Generic.IDictionary2)
000000ac8a20e240 00007ff80c98ac07 Microsoft.ApplicationInsights.EventSourceListener.EventSourceTelemetryModule.EnableAsNecessary(System.Diagnostics.Tracing.EventSource)
000000ac8a20e2c0 00007ff80c98a853 Microsoft.ApplicationInsights.EventSourceListener.EventSourceTelemetryModule.Initialize(Microsoft.ApplicationInsights.Extensibility.TelemetryConfiguration) << Locks on Microsoft.ApplicationInsights.EventSourceListener.EventSourceTelemetryModule

Reference:
https://github.com/Microsoft/ApplicationInsights-dotnet-logging/blob/63a6886743dc025fe523324921c3667525d6ee95/src/Adapters/EventSource.Netstandard13/EventSourceTelemetryModule.cs#L122-L148