[SIMD] Blazor Web App will not load webassembly component on virtualized machines with Chromium browser

[mtbayley]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

I can't think of how this is possible, but I get this message on startup of my published AOT compiled Blazor Web App. Some machines have no problem loading the site, but some machines show this error consistently.

Any help on where to look would be appreciated

Expected Behavior

No response

Steps To Reproduce

No response

Exceptions (if any)

blazor.web.js:1  Error: AggregateException_ctor_DefaultMessage (EndOfStringNotFound Path: $['__internal__AntiforgeryRequestToken'] | LineNumber: 0 | BytePositionInLine: 2340.)
    at Jn (dotnet.runtime.8.0.6.cfhqwq2l7j.js:3:31614)
    at Tl (dotnet.runtime.8.0.6.cfhqwq2l7j.js:3:182415)
    at 0fd5c22a:0x27ba236
    at 0fd5c22a:0x27bbcf8
    at 0fd5c22a:0x27c169c
    at 0fd5c22a:0x2f2f5a4
    at 0fd5c22a:0x31d0e0e
    at 0fd5c22a:0x31ede66
    at 0fd5c22a:0x31cd780
    at 0fd5c22a:0x31c0b7d
callEntryPoint @ blazor.web.js:1
await in callEntryPoint (async)
ti @ blazor.web.js:1
await in ti (async)
ei @ blazor.web.js:1
startWebAssemblyIfNotStarted @ blazor.web.js:1
resolveRendererIdForDescriptor @ blazor.web.js:1
determinePendingOperation @ blazor.web.js:1
refreshRootComponents @ blazor.web.js:1
(anonymous) @ blazor.web.js:1
setTimeout (async)
rootComponentsMayRequireRefresh @ blazor.web.js:1
onDocumentUpdated @ blazor.web.js:1
Ki @ blazor.web.js:1
Ji @ blazor.web.js:1
(anonymous) @ (index):770

.NET Version

8.0.6

Anything else?

No response

[mtbayley]

I can confirm that the issue is gone when RunAOTCompilation is false

[javiercn]

@mtbayley thanks for contacting us.

This seems like a bug in the AoT process. Do you happen to have a repro project that we can use to troubleshoot this issue? In the meantime I'm going to transfer this to the runtime so they can investigate.

[javiercn]

@lewing FYI

[mtbayley]

Hi @javiercn, @lewing
Here's a link to a minimal repro project. It is just the Blazor web app template with RunAOTCompilation set to true

https://github.com/mtbayley/TestAot

I've been able to trigger it on some machines by navigating to the Counter page. Then loading the Weather page. Then going back to the Counter page. Same exception occurs.

[mtbayley]

Another update:
The machines that it fails on are all virtualized. All physical machines I have tested so far have no issues

[mtbayley]

On the virtualized machines, only chromium based browsers do not work (chrome, edge). Firefox works.

[mtbayley]

Setting WasmEnableSIMD to false works around the issue. I can't understand why. SIMD should be supported by all major browsers

[maraf]

Looks similar as #96004

[steveisok]

@maraf is there any action we can take?

[pavelsavara]

This is likely that the VM + browser can't use SIMD. The workaround is to disabler the SIMD.

See https://github.com/dotnet/runtime/blob/main/src/mono/wasm/features.md on how to do it