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Fix ArrayIndexOutOfBoundsException in ThrowableStackTraceRenderer when the stack trace is mutated concurrently#3955

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vy merged 6 commits intoapache:2.xfrom
mosche:3940_fix_ThrowableStackTraceRenderer
Oct 20, 2025
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Fix ArrayIndexOutOfBoundsException in ThrowableStackTraceRenderer when the stack trace is mutated concurrently#3955
vy merged 6 commits intoapache:2.xfrom
mosche:3940_fix_ThrowableStackTraceRenderer

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@mosche mosche commented Oct 14, 2025 •
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Fix ArrayIndexOutOfBoundsException in ThrowableStackTraceRenderer if concurrently modifying the stack trace of a Throwable while rendering it

Closes #3940

This was referenced Oct 14, 2025
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github-actions bot commented Oct 14, 2025 •
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Job Requested goals Build Tool Version Build Outcome Build Scan®
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@vy vy self-assigned this Oct 15, 2025
@vy vy changed the title Fix ArrayIndexOutOfBoundsException in ThrowableStackTraceRenderer when concurrently mutating the stacktrace Fix ArrayIndexOutOfBoundsException in ThrowableStackTraceRenderer when the stack trace is mutated concurrently Oct 17, 2025
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vy approved these changes Oct 17, 2025
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@mosche, thanks so much for the contribution. I've confirmed that both tests (the new one, and the old one of #3929) fail in the absence their associated fixes.

@vy vy enabled auto-merge (squash) October 17, 2025 13:04
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mosche commented Oct 17, 2025

Ugh, sorry, I missed configuring git to sign commits for this repo. My bad! Are you ok if I rewrite the history here? Sorry for that, you'll have to fix your commits afterwards then

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mosche commented Oct 17, 2025

Thanks for the quick response here btw!

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vy commented Oct 17, 2025

@mosche, yes, you must override the history. Please keep the content intact. git rebase -i HEAD~6 && git push -f origin 3940_fix_ThrowableStackTraceRenderer should do the trick. You can also squash all in one commit – but keep the diff intact.

auto-merge was automatically disabled October 17, 2025 18:20

Head branch was pushed to by a user without write access

@mosche mosche force-pushed the 3940_fix_ThrowableStackTraceRenderer branch from 5d64cca to f208e1b Compare October 17, 2025 18:20
@vy vy merged commit c9a38ed into apache:2.x Oct 20, 2025
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@github-project-automation github-project-automation bot moved this from To triage to Done in Log4j bug tracker Oct 20, 2025
@vy vy added this to the 2.26.0 milestone Mar 29, 2026
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Log4j bug tracker
Status: Done

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Successfully merging this pull request may close these issues.

ThrowableStackTraceRenderer can throw an ArrayIndexOutOfBoundsException when rendering a Throwable with a concurrently-mutated stacktrace

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