[Mono-dev] Non-sensical stack trace (possible issue with generic sharing?)

[Zoltan Varga]

Hi,

  Try running with -O=-gshared to see whenever this is a generic sharing
problem. The stack trace might be missing the List.Add () method for some
reason.

              Zoltan


On Thu, Aug 15, 2013 at 1:29 AM, Bassam Tabbara <bassam at symform.com> wrote:

>  On an armv5tel with latest mono from master I see the following
> exception frequently in our automated test runs:
>
>  System.ArgumentOutOfRangeException: Value has to be >= 0.
> Parameter name: destinationIndex
>   at System.Array.Copy (System.Array sourceArray, Int32 sourceIndex,
> System.Array destinationArray, Int32 destinationIndex, Int32 length)
> [0x00207] in
> /root/build-thirdparty/mono/mcs/class/corlib/System/Array.cs:1016
>   at
> System.Collections.Generic.List`1[Symform.Control.Common.Placement.NodeEndPoint].CopyTo
> (Symform.Control.Common.Placement.NodeEndPoint[] array, Int32 arrayIndex)
> [0x00000] in
> /root/build-thirdparty/mono/mcs/class/corlib/System.Collections.Generic/List.cs:203
>   at Newtonsoft.Json.Utilities.CollectionWrapper`1[System.Object].Add
> (System.Object item) [0x00000] in <filename unknown>:0
>   at
> Newtonsoft.Json.Utilities.CollectionWrapper`1[System.Object].System.Collections.IList.Add
> (System.Object value) [0x00000] in <filename unknown>:0
>   at
> Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateList
> (IWrappedCollection wrappedList, Newtonsoft.Json.JsonReader reader,
> Newtonsoft.Json.Serialization.JsonArrayContract contract,
> Newtonsoft.Json.Serialization.JsonProperty containerProperty, System.String
> id) [0x00000] in <filename unknown>:0
>
>  Whats odd about this stack trace is that
> JsonSerializeInternalReader.PopulateList does not call
> CollectionWrapper`1.Add, nor does Add call List`1.CopyTo. See
> http://json.codeplex.com/SourceControl/latest#trunk/Src/Newtonsoft.Json/Utilities/CollectionWrapper.cs
> .
>
>  Is it possible that the stack trace is mangled, or is this a generic
> sharing problem?
>
>  Note I do not see this issue on x86 or amd64, and did not see this with
> mono-2-10 on all platforms.
>
>  Thanks!
> Bassam
>
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