Make forced signal flush raw-clone safe - #4222
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Prepare an independent sidecar connection and serialized flush request before signal delivery. The SIGINT and SIGTERM handler starts a one-shot raw clone that uses audited direct syscalls while waiting for an ACK or timeout, avoiding libc and allocator state in the unrepaired clone. Track worker lifetime with lock-free the kernel clear_child_tid futex protocol.
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Avoid allocation crashes in the flush worker launched by the sigterm/sigint handler.
Prepare an independent sidecar connection and serialized flush request before signal delivery. The SIGINT and SIGTERM handler starts a one-shot raw clone that uses audited direct syscalls while waiting for an ACK or timeout, avoiding libc and allocator state in the unrepaired clone.
Track worker lifetime with lock-free the kernel clear_child_tid futex protocol.