Conhost crashes after SetConsoleScreenBufferSize call if wrapping on resize is enabled #9461
Description
Environment
Windows build number: 10.0.19042.867 (20H2)
conhost.exe version: 10.0.19041.746
Steps to reproduce
- Start a Command Prompt.
- Open the properties and make sure Wrap text output on resize is enabled.
- Launch the program below.
#include <Windows.h> int main() { const int Width = 40, Height = 20; HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE); SMALL_RECT window = { 0, 0, Width - 1, Height - 1 }; COORD size = { Width, Height }; if (SetConsoleWindowInfo(hConsole, TRUE, &window)) { // BUG: conhost.exe crashes after this call if "Wrap text output on resize" is enabled SetConsoleScreenBufferSize(hConsole, size); } }Expected behavior
No crash.
Actual behavior
Most of the time conhost.exe crashes with the following call stack:
KERNELBASE!RaiseException ucrtbase!_CxxThrowException conhost!wil::details::ThrowResultExceptionInternal conhost!wil::ThrowResultException conhost!wil::details::ReportFailure conhost!wil::details::ReportFailure_Hr conhost!wil::details::in1diag3::_Throw_Hr conhost!wil::details::in1diag3::Throw_HrIf conhost!TextBufferCellIterator::{ctor} conhost!TextBuffer::GetCellDataAt conhost!Microsoft::Console::Render::Renderer::_PaintBufferOutput conhost!Microsoft::Console::Render::Renderer::_PaintFrameForEngine conhost!Microsoft::Console::Render::Renderer::PaintFrame conhost!Microsoft::Console::Render::RenderThread::_ThreadProc KERNEL32!BaseThreadInitThunk ntdll!RtlUserThreadStart The same program works correctly on Windows 7, so this is a regression. I could not find any open issues that might be duplicates of this one. Cc @zadjii-msft @j4james.