VSCode.CPP.IntelliSense segfault when open my code

[everything411]

Issue Type: Bug

/* my code begin */
#include<cstdio>
using namespace std;
#define maxn = 1e5 + 7;
struct nd
{
    int l, r, v, lz;
} seg[maxn << 2];
/* something else */
/* my code end */

Originally ,I write "const int maxn = 1e5 + 7;" and then I change it to use define, but I forget changing other parts of this line ,thus causing a syntax error. However when my mouse points to the "maxn << 2" syntax error, IntelliSense crashed.
Since I tried this opeartion 4 times, there are 4 faults in my dmesg

dmesg

[251120.472569] Microsoft.VSCod[14781]: segfault at 7300000060 ip 00000000008608f8 sp 00007f76277fce90 error 4 in Microsoft.VSCode.CPP.IntelliSense.Msvc.linux[400000+78e000]
[251120.472588] Code: 01 00 00 bf 09 00 00 00 e8 85 d0 f2 ff 48 8b 48 48 80 49 18 04 49 8b 0e 48 89 48 40 49 89 06 48 89 45 00 48 89 c5 4c 8d 70 40 <49> 8b 06 48 85 c0 74 57 4f 8d 74 2c 38 4b 8b 54 2c 38 48 85 d2 75
[251170.017497] traps: Microsoft.VSCod[14997] general protection ip:77dd50 sp:7f7197ffdeb0 error:0 in Microsoft.VSCode.CPP.IntelliSense.Msvc.linux[400000+78e000]
[251410.801681] traps: Microsoft.VSCod[15154] general protection ip:77dd50 sp:7fd5e3ea5eb0 error:0 in Microsoft.VSCode.CPP.IntelliSense.Msvc.linux[400000+78e000]
[251425.344450] traps: Microsoft.VSCod[15179] general protection ip:77dd50 sp:7f7159a3ceb0 error:0 in Microsoft.VSCode.CPP.IntelliSense.Msvc.linux[400000+78e000]Microsoft.VSCode.CPP.IntelliSense.Msvc.linux[400000+78e000]

Extension version: 0.21.0
VS Code version: Code 1.30.2 (61122f88f0bf01e2ac16bdb9e1bc4571755f5bd8, 2019-01-07T22:49:48.319Z)
OS version: Linux x64 4.19.0-1-amd64

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz (8 x 3560)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: disabled_software rasterization: disabled_software video_decode: unavailable_software video_encode: unavailable_software webgl: enabled webgl2: enabled
Load (avg)	1, 0, 0
Memory (System)	15.54GB (7.83GB free)
Process Argv	--unity-launch
Screen Reader	no
VM	0%

[sean-mcmanus]

Thanks a lot for the repro. It's a bug with our parser in gcc/clang mode (not msvc/cl.exe mode). It's a regression starting with this release.

[sean-mcmanus]

The bug also repros with Visual Studio 2019 Preview 2, so I filed a bug with them https://developercommunity.visualstudio.com/content/problem/439866/c-intellisense-process-vcpkgsrvexe-crashes-when-ho.html . People hitting issues like this should upvote that issue.

[sean-mcmanus]

Fixed with https://github.com/microsoft/vscode-cpptools/releases/tag/0.24.0-insiders3 . Set the "C_Cpp.updateChannel" setting to "Insiders" to auto-install the latest Insiders vsix. Or if that doesn't work (such as in the remote scenario), manually download and install the vsix that matches the target OS.