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Merge remote-tracking branch 'origin/topic/awelzel/4849-supervisor-signal-handle-tsan'
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* origin/topic/awelzel/4849-supervisor-signal-handle-tsan: Supervisor: Make last_signal atomic to squelch data race
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8.1.0-dev.612 | 2025-09-29 18:04:24 +0200
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* Supervisor: Make last_signal atomic to squelch data race (Arne Welzel, Corelight)
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When the stem process terminates and SIGCHLD is sent to the supervisor,
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the signal might be handled by the main thread or any other threads that
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aren't blocking SIGCHLD explicitly. Convert last_signal to a std::atomic<int>
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such that non-main threads can safely set last_signal without triggering
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data race as reported by TSAN. This doesn't make it less racy to work
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last_signal, but it appears we only use it for debug printing anyhow and
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another option might have been to just remove last_signal altogether.
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Follow-up for #4849
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8.1.0-dev.610 | 2025-09-29 08:21:01 -0700
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* Update docs submodule [nomail] (Tim Wojtulewicz, Corelight)
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