[browser][debugger][MT] CallFunctionOnTests.RunOnInvalidCfoId

[pavelsavara]

[xUnit.net 00:08:09.53]     DebuggerTests.CallFunctionOnTests.RunOnInvalidCfoId(eval_fn: "negative_cfo_test ();", bp_loc: "/other.js", line: 64, col: 1, use_cfo: False) [FAIL]
Detected a container, disabling sandboxing for debugger tests.
  Failed DebuggerTests.CallFunctionOnTests.RunOnInvalidCfoId(eval_fn: "negative_cfo_test ();", bp_loc: "/other.js", line: 64, col: 1, use_cfo: False) [1 ms]
  Error Message:
   System.AggregateException : One or more errors occurred. (Index was outside the bounds of the array.)
---- System.IndexOutOfRangeException : Index was outside the bounds of the array.
  Stack Trace:
     at DebuggerTests.Inspector.OpenSessionAsync(Func`3 getInitCmds, String urlToInspect, TimeSpan span) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 377
   at DebuggerTests.DebuggerTestBase.InitializeAsync() in /_/src/mono/wasm/debugger/DebuggerTestSuite/DebuggerTestBase.cs:line 173
----- Inner Stack Trace -----
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.set_Item(TKey key, TValue value)
   at DebuggerTests.InspectorClient.SendCommand(SessionId sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/InspectorClient.cs:line 98
   at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 219
  Standard Output Messages:

...

[2023-06-08T20:02:59] Inspector-67 Error: _isFailingWithException. System.AggregateException: One or more errors occurred. (Index was outside the bounds of the array.)
 |                                            ---> System.IndexOutOfRangeException: Index was outside the bounds of the array.
 |                                              at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
 |                                              at System.Collections.Generic.Dictionary`2.set_Item(TKey key, TValue value)
 |                                              at DebuggerTests.InspectorClient.SendCommand(SessionId sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/InspectorClient.cs:line 98
 |                                              at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 219
 |                                              --- End of inner exception stack trace ---
 |                                              at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 220
 |                                              at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 219
 |                                              at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 220
 |                                              at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 223
 |                                              at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 221
 |                                              at DebuggerTests.Inspector.<OpenSessionAsync>b__40_1() in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 362.

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Issue Details

---

[xUnit.net 00:08:09.53]     DebuggerTests.CallFunctionOnTests.RunOnInvalidCfoId(eval_fn: "negative_cfo_test ();", bp_loc: "/other.js", line: 64, col: 1, use_cfo: False) [FAIL]
Detected a container, disabling sandboxing for debugger tests.
  Failed DebuggerTests.CallFunctionOnTests.RunOnInvalidCfoId(eval_fn: "negative_cfo_test ();", bp_loc: "/other.js", line: 64, col: 1, use_cfo: False) [1 ms]
  Error Message:
   System.AggregateException : One or more errors occurred. (Index was outside the bounds of the array.)
---- System.IndexOutOfRangeException : Index was outside the bounds of the array.
  Stack Trace:
     at DebuggerTests.Inspector.OpenSessionAsync(Func`3 getInitCmds, String urlToInspect, TimeSpan span) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 377
   at DebuggerTests.DebuggerTestBase.InitializeAsync() in /_/src/mono/wasm/debugger/DebuggerTestSuite/DebuggerTestBase.cs:line 173
----- Inner Stack Trace -----
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.set_Item(TKey key, TValue value)
   at DebuggerTests.InspectorClient.SendCommand(SessionId sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/InspectorClient.cs:line 98
   at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 219
  Standard Output Messages:

...

[2023-06-08T20:02:59] Inspector-67 Error: _isFailingWithException. System.AggregateException: One or more errors occurred. (Index was outside the bounds of the array.)
 |                                            ---> System.IndexOutOfRangeException: Index was outside the bounds of the array.
 |                                              at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
 |                                              at System.Collections.Generic.Dictionary`2.set_Item(TKey key, TValue value)
 |                                              at DebuggerTests.InspectorClient.SendCommand(SessionId sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/InspectorClient.cs:line 98
 |                                              at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 219
 |                                              --- End of inner exception stack trace ---
 |                                              at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 220
 |                                              at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 219
 |                                              at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 220
 |                                              at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 223
 |                                              at DebuggerTests.Inspector.OnMessage(String sessionId, String method, JObject args, CancellationToken token) in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 221
 |                                              at DebuggerTests.Inspector.<OpenSessionAsync>b__40_1() in /_/src/mono/wasm/debugger/DebuggerTestSuite/Inspector.cs:line 362.

Build
log

Author:	pavelsavara
Assignees:	thaystg, ilonatommy
Labels:	arch-wasm, area-Debugger-mono
Milestone:	8.0.0

[mdh1418]

Seeing the same with DebuggerTests.MonoJsTests.RaiseDebugEventTraceTest on #84191 for build
log

[ilonatommy]

Reason: "A Dictionary<TKey,TValue> can support multiple readers concurrently, as long as the collection is not modified.".
pending_cmds is getting modified from different threads which sometimes causes the issue:

runtime/src/mono/wasm/debugger/DebuggerTestSuite/InspectorClient.cs

Line 98 in 7b25983

pending_cmds[new MessageId(sessionId.sessionId, id)] = tcs;

I'll try ConcurrentDictionary instead, as docs suggest.