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[PR #10031] Fix TerminalControl crash on exit #27863

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opened 2026-01-31 09:24:45 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:24:45 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/10031

State: closed
Merged: Yes

Summary of the Pull Request

ControlCore's _renderer (IRenderTarget) is allocated as std::unique_ptr,
but is given to Terminal::CreateFromSettings as a reference.
ControlCore::Close deallocates the _renderer, but if ThrottledFuncs
are still scheduled to call ControlCore::UpdatePatternLocations
it'll cause Terminal::UpdatePatterns to be called, which in turn ends up
accessing the deallocated IRenderTarget reference and lead to a crash.

A proper solution with shared pointers is nontrivial and should be
attempted at a later point in time. This solution moves the teardown of
the _renderer into ControlCore::~ControlCore, where we can be certain
that no further strong references are held by ThrottledFuncs.

PR Checklist

Validation Steps Performed

The crash is a race condition and inherently hard to reproduce.
During validation this PR didn't appear to introduce new crashes.

**Original Pull Request:** https://github.com/microsoft/terminal/pull/10031 **State:** closed **Merged:** Yes --- ## Summary of the Pull Request ControlCore's _renderer (IRenderTarget) is allocated as std::unique_ptr, but is given to Terminal::CreateFromSettings as a reference. ControlCore::Close deallocates the _renderer, but if ThrottledFuncs are still scheduled to call ControlCore::UpdatePatternLocations it'll cause Terminal::UpdatePatterns to be called, which in turn ends up accessing the deallocated IRenderTarget reference and lead to a crash. A proper solution with shared pointers is nontrivial and should be attempted at a later point in time. This solution moves the teardown of the _renderer into ControlCore::~ControlCore, where we can be certain that no further strong references are held by ThrottledFuncs. ## PR Checklist * [x] Closes #9910 * [x] I work here * [x] Tests added/passed ## Validation Steps Performed The crash is a race condition and inherently hard to reproduce. During validation this PR didn't appear to introduce new crashes.
claunia added the pull-request label 2026-01-31 09:24:45 +00:00
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Reference: starred/terminal#27863
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