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Spurious LLDB segfault (signal 11) #45230

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Description

Symptom: debuginfo-lldb tests failed with signal 11. Only happens on macOS (others use GDB) and usually i686, and only one test is failing.

Example logs (look for "status: signal: 11"):

[01:40:10] failures:
[01:40:10] 
[01:40:10] ---- [debuginfo-lldb] debuginfo/lexical-scopes-in-block-expression.rs stdout ----
[01:40:10] 	NOTE: compiletest thinks it is using LLDB version 360
[01:40:10] 
[01:40:10] error: Error while running LLDB
[01:40:10] status: signal: 11
[01:40:10] command: "/usr/bin/python" "/Users/travis/build/rust-lang/rust/src/etc/lldb_batchmode.py" "/Users/travis/build/rust-lang/rust/build/x86_64-apple-darwin/test/debuginfo/lexical-scopes-in-block-expression.stage2-x86_64-apple-darwin" "/Users/travis/build/rust-lang/rust/build/x86_64-apple-darwin/test/debuginfo/lexical-scopes-in-block-expression.debugger.script"
[01:40:10] stdout:
[01:40:10] ------------------------------------------
[01:40:10] LLDB batch-mode script
[01:40:10] ----------------------
...

Affected PRs:

Related: #42693 (GDB failed due to ERROR_NOT_ENOUGH_QUOTA on Windows)

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    A-spuriousArea: Spurious failures in builds (spuriously == for no apparent reason)Area: Spurious failures in builds (spuriously == for no apparent reason)C-tracking-issueCategory: A tracking issue for an RFC or an unstable feature.Category: A tracking issue for an RFC or an unstable feature.T-infraRelevant to the infrastructure team, which will review and decide on the PR/issue.Relevant to the infrastructure team, which will review and decide on the PR/issue.

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