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SubjectA Bug Inquiry in linux/tools/perf/builtin-record.c
Hi all,

There is a bug found in my work when running "perf record". The basic information
is here. As we know, perf record is a parent process and the programme traced is
a child process when running "perf record". Sometimes the child process become
zombie state and disappear until the parent process is killed. The bug stays in linux/
tools/perf/builtin-record.c.
*********************************************************************
static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
......
if (hits == rec->samples) {
if (done)
break;
err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1);
waking++;
}
......
*********************************************************************
The parent process still call the function
poll(evsel_list->pollfd, evsel_list->nr_fds, -1) when the child process has exited
already, which caused a zombie process.

May I have your opinion ?
Waiting for your reply!

Best Regards
Kaixu Xia



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