runtime: System.Text.Json.JsonSerializer.Deserialize crashes when parsing large string using Blazor

This issue has been moved from a ticket on Developer Community.

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[severity:Other] [regression] [worked-in:somewhere before 16.7.1] Using Blazor/Wasm (3.2.0) and trying to parse a large json-string (135123600 chars) loaded from a file on my local windows machine, System.Text.Json.JsonSerializer.Deserialize crashes with the following internal exception (or similar, varies somewhat from run to run):

Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100] Unhandled exception rendering component: ‘r’ is an invalid start of a property name. Expected a ‘"’. Path: $[4888].ID | LineNumber: 63547 | BytePositionInLine: 0. System.Text.Json.JsonException: ‘r’ is an invalid start of a property name. Expected a ‘"’. Path: $[4888].ID | LineNumber: 63547 | BytePositionInLine: 0. —> System.Text.Json.JsonReaderException: ‘r’ is an invalid start of a property name. Expected a ‘"’. LineNumber: 63547 | BytePositionInLine: 0. at System.Text.Json.ThrowHelper.ThrowJsonReaderException (System.Text.Json.Utf8JsonReader& json, System.Text.Json.ExceptionResource resource, System.Byte nextByte, System.ReadOnlySpan`1[T] bytes) <0x8575f78 + 0x00020> in <filename unknown>:0 at System.Text.Json.Utf8JsonReader.ConsumeNextToken (System.Byte marker) <0x285e1d8 + 0x00264> in <filename unknown>:0 at System.Text.Json.Utf8JsonReader.ConsumeNextTokenOrRollback (System.Byte marker) <0x285dfa8 + 0x0003a> in <filename unknown>:0 at System.Text.Json.Utf8JsonReader.ReadSingleSegment () <0x2851dd8 + 0x001de> in <filename unknown>:0 at System.Text.Json.Utf8JsonReader.Read () <0x2851960 + 0x0000e> in <filename unknown>:0 at System.Text.Json.JsonSerializer.ReadCore (System.Text.Json.JsonSerializerOptions options, System.Text.Json.Utf8JsonReader& reader, System.Text.Json.ReadStack& readStack) <0x28799e0 + 0x00060> in <filename unknown>:0

Line number of the file and position varies where it fails /(and therefore what is expected (number, string or property name).

The string contains a list of objects like:

[ { “ID”: 0, “DateTime”: “2018-08-09T08:57:34”, “SiteWrapper”: null, “SiteWrapperID”: 1, “Lev”: [ 40.3, 0, 78.9, 65.6, 55.5 ] }, { “ID”: 0, “DateTime”: “2018-08-09T08:57:35”, “SiteWrapper”: null, “SiteWrapperID”: 1, “Lev”: [ 70.4, 72.1, 71.2, 0, 64.5 ] },

and so on. (all in all 604621 instances). (so far tested on Chrome 84.0.4147.135 and Microsoft Edge 44.18362.449.0)

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Original Comments

Feedback Bot on 8/27/2020, 01:09 AM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

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Original Solutions

(no solutions)