f481ac716d
when alarmkproc is commited to send the alarm note to the process, the process might have exited already, or worse, being reused for another process. pexit() zeros p->alarm at the beginning, but the kalarmproc() might read p->alarm before pexit() zeroed it, decide to send the note, then get preempted and pexit() releases the proc. once kalarmproc() is resumed, the proc might be already something different and we send the note to the wrong thing. we now check p->alarm under the debug qlock. that way, pexit() cannot make progress while we test the condition. remove the error label arround postnote(). postnote does not raise error. |
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