…lutter#184868)

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Reverts: flutter#184768
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Initiated by: flar
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Reason for reverting: flutter#184867
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Original PR Author: vashworth
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Reviewed By: {hellohuanlin}
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This change reverts the following previous change:
@mraleph proposed a [better
fix](flutter#184254 (comment))
for the LLDB Xcode 26.4 breakage and I confirmed that it works.

This PR reverts the first fix and adopts the new one, which is to set
LLDB to not use async mode.

For flutter#184254.

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responsibilities.
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we expect every widget to implement].
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- [x] I listed at least one issue that this PR fixes in the description
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- [x] I updated/added relevant documentation (doc comments with `///`).
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…lutter#184868)

…lutter#184868)

…lutter#184868)

…lutter#184868)

flutter/flutter@81c87ea...bf18e39

2026-04-10 [email protected] [flutter_tools] Fix arm64e incorrectly matching arm64 in regex check (flutter/flutter#184057)
2026-04-10 [email protected] Specify GitHub Repo in GH CLI calls for revert workflow. (flutter/flutter#184878)
2026-04-10 [email protected] Don't use `git add -N` in the sync engine workflow. (flutter/flutter#184882)
2026-04-10 [email protected] Roll Skia from af67d5555e35 to 25b01e5f4ea0 (14 revisions) (flutter/flutter#184865)
2026-04-10 [email protected] [Dot shorthands] Finish examples/api migration (flutter/flutter#183967)
2026-04-10 [email protected] Roll Dart SDK from 98a143f8873e to e715805ddbd3 (1 revision) (flutter/flutter#184864)
2026-04-10 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Disable async mode with LLDB (#184768)" (flutter/flutter#184868)
2026-04-09 [email protected] Skip freeze check in the merge queue (flutter/flutter#184854)
2026-04-09 [email protected] Remove unused variable in `ProcessTextPlugin.java` (flutter/flutter#184161)
2026-04-09 [email protected] Roll Fuchsia Linux SDK from pDXMXRIjEHTw7B0sk... to lZcRfPoCLnDttrf9P... (flutter/flutter#184842)
2026-04-09 [email protected] Roll Dart SDK from bd6280c3e8e9 to 98a143f8873e (5 revisions) (flutter/flutter#184824)
2026-04-09 [email protected] Remove `linux_android_emu_unstable android_engine_vulkan_tests` (flutter/flutter#184787)
2026-04-09 [email protected] Roll Packages from 0e0a032 to 1aa892c (9 revisions) (flutter/flutter#184829)
2026-04-09 [email protected] [record_use] Add experimental flag and test project (flutter/flutter#184719)
2026-04-09 [email protected] Disable async mode with LLDB (flutter/flutter#184768)
2026-04-09 [email protected] Update link for rolling forward to aligned Dart hash (flutter/flutter#184780)
2026-04-09 [email protected] Roll Skia from 4d0f5389e131 to af67d5555e35 (3 revisions) (flutter/flutter#184825)
2026-04-09 [email protected] UberSDFContent refactoring and handle stroke miter limit for stroked rects (flutter/flutter#184603)

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…#184254)

Xcode 26.4's LLDB has a race condition where breakpoints randomly fail
to rearm after firing, causing EXC_BAD_ACCESS crashes on DartWorker
threads (~80% failure rate). This disables LLDB's async mode via
SetAsync(False) so breakpoint events are processed sequentially,
eliminating the race.

This re-lands the approach from flutter#184768 (reverted in flutter#184868 due to
test failures) with corrected tests that expect synchronous mode
output ('location added to breakpoint' instead of 'Process X resuming').

Also removes the manual stop/continue workaround from flutter#184690 and the
Xcode version dependency from the LLDB class, since SetAsync(False)
is safe on all LLDB versions.

Upstream bug: llvm/llvm-project#190956

<!-- start_original_pr_link -->
Reverts: flutter#184768
<!-- end_original_pr_link -->
<!-- start_initiating_author -->
Initiated by: flar
<!-- end_initiating_author -->
<!-- start_revert_reason -->
Reason for reverting: flutter#184867
<!-- end_revert_reason -->
<!-- start_original_pr_author -->
Original PR Author: vashworth
<!-- end_original_pr_author -->

<!-- start_reviewers -->
Reviewed By: {hellohuanlin}
<!-- end_reviewers -->

<!-- start_revert_body -->
This change reverts the following previous change:
@mraleph proposed a [better
fix](flutter#184254 (comment))
for the LLDB Xcode 26.4 breakage and I confirmed that it works.

This PR reverts the first fix and adopts the new one, which is to set
LLDB to not use async mode.

For flutter#184254.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [AI contribution guidelines] and understand my
responsibilities, or I am not using AI tools.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

If this change needs to override an active code freeze, provide a
comment explaining why. The code freeze workflow can be overridden by
code reviewers. See pinned issues for any active code freezes with
guidance.

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Assist for
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Co-authored-by: auto-submit[bot] <[email protected]>