fix: worker cannot send signal to manager when running as non-root user #5882
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This PR fixes an issue where a worker process failed to send a
SIGIOsignal to the manager process afterpush_messageduring theasync_reloadphase when running as a non-root user.Modifying the manager process’s SUID would be a simpler workaround, but it may introduce security risks.
As an alternative, this patch delegates the signal delivery to the reactor thread.