Egor Bogatov

> @EgorBo did you, by any chance, looked at it? Curious what's the difference between those. The only @psfinaki collected looks extremely weird to me. I propose we merge this...

I'm not able to reproduce this locally and am not sure it's a JIT issue, the stack trace looks like the following: ``` Assert failure(PID 7236 [0x00001c44], Thread: 9044 [0x2354]):...

> The most likely cause of this assert is GC handle double-free. The only other hit in this repo is [#55596 (comment)](https://github.com/dotnet/runtime/pull/55596#issuecomment-880137400) that was GC handle double-free bug. > >...

@jkotas in case if it rings a bell, additional info from the memory dump ([this](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1154270&view=ms.vss-test-web.build-test-results-tab&runId=31887636&resultId=219302)): Full stack-trace: https://gist.github.com/EgorBo/c3214d6bdb9fcb4f409884b3a5402251 I guess the test where it fails is `System_Memory_Tests!System.SpanTests.ReadOnlySpanTests.TestMultipleMatchLastIndexOfAny_String_TwoByte` and OSR is...