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Since Linux 5.4 (821cc7b0b205, "waitid: Add support for waiting for the current process group"), P_PGID with an id of 0 means the caller's process group. rr matched it against process group 0 instead, so emulated stops weren't reported to such a wait: with WNOHANG it returned no child, otherwise it blocked. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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[Encountered, patch, test by AI]
Since Linux 5.4 (821cc7b0b205, "waitid: Add support for waiting for the current process group"), P_PGID with an id of 0 means the caller's process group. rr matched it against process group 0 instead, so emulated stops weren't reported to such a wait: with WNOHANG it returned no child, otherwise it blocked.