Unable to see any VARIABLES or WATCH variable values

Issue Type: Bug

I am using Visual Studio Code with the Microsoft C/C++ extension to debug a native 64 bit Windows application, compiled using Visual Studio 2019, latest update. Sometimes you cannot see any local variables, the display just shows this in red:

Error processing 'variables' request.

The watch window shows: An unspecified error has occurred.

Please see the screen show.

Sometimes when you step through or over code, you temporarily see this status, and it goes away again. But in the last few weeks, especially after the last few C/C++ extension updates, it seems far more common and does not recover, unless you restart the debugging session, and then maybe it will work again for some time.

PLEASE HELP. Sadly the code project is massive, not easy to share, and it does not always happen. What extra information can I provide, is there some sort of log file, or way to debug this extension.

Visual Studio Code has been work so well, and this used to never happen, but in recent times this has become more common.

Extension version: 1.7.1
VS Code version: Code 1.61.2 (6cba118ac49a1b88332f312a8f67186f7f3c1643, 2021-10-19T14:57:20.575Z)
OS version: Windows_NT x64 10.0.19043
Restricted Mode: No

vsliv368cf:30146710
vsreu685:30147344
python383cf:30185419
pythonvspyt602:30300191
vspor879:30202332
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pythonvspyt639:30300192
pythontb:30283811
pythonvspyt551cf:30345471
pythonptprofiler:30281270
vshan820:30294714
vstes263:30335439
pythondataviewer:30285071
pythonvsuse255:30340121
vscod805cf:30301675
pythonvspyt200:30340761
binariesv615:30325510
vsccppwt:30382697
pythonvssor306:30344512
bridge0708:30335490
pygetstartedt3:30385195
dockerwalkthru:30377721
bridge0723:30353136
pythonrunftest32:30373476
pythonf5test824:30373475
javagetstartedt:30364666
pythonvspyt187:30373474
vsqsis400:30386382
vsaa593:30376534
vssld246cf:30386378

首先，在调试所报告的原生 64-bit Windows 应用程序时，复现 VS Code C/C++ extension 中缺失的 Variables 和 Watch 值。收集 issue 中要求的 extension 和 debugger 日志，并比较单步执行期间以及重启后的会话中的行为；在确定可复现的原因并恢复可靠的变量检查后即算完成。