AVs in emitDispJumpList

[jakobbotsch]

I am frequently hitting access violations inside emitDispJumpList on x64 when jit dump is enabled.
Easy way to repro it is to set COMPlus_JitStdOutFile=foo.txt and COMPlus_JitDump=* and run superpmi.
For the one example case I looked at iiaBBLabel is not a valid pointer and the instrDescJmp* we are processing is the jne in the following code:

IN0671:        vmovdqu  xmmword ptr [ebp+eax-0CH], xmm4
IN0672:        vmovdqu  xmmword ptr [ebp+eax+04H], xmm4
IN0673:        vmovdqu  xmmword ptr [ebp+eax+14H], xmm4
IN0674:        add      eax, 48
IN0675:        jne      SHORT  -5 instr

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Issue Details

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I am frequently hitting access violations inside emitDispJumpList on x64 when jit dump is enabled.
Easy way to repro it is to set COMPlus_JitStdOutFile=foo.txt and COMPlus_JitDump=* and run superpmi.
For the one example case I looked at iiaBBLabel is not a valid pointer and the instrDescJmp* we are processing is the jne in the following code:

IN0671:        vmovdqu  xmmword ptr [ebp+eax-0CH], xmm4
IN0672:        vmovdqu  xmmword ptr [ebp+eax+04H], xmm4
IN0673:        vmovdqu  xmmword ptr [ebp+eax+14H], xmm4
IN0674:        add      eax, 48
IN0675:        jne      SHORT  -5 instr

Author:	jakobbotsch
Assignees:	-
Labels:	area-CodeGen-coreclr
Milestone:	-

[jakobbotsch]

cc @kunalspathak

[kunalspathak]

Thanks @jakobbotsch . I will take a look.

[AndyAyersMS]

I'm hitting this too, on windows arm64.

[kunalspathak]

Yep, will send out PR soon.