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SubjectRe: [PATCH] perf/report: Report OOM in perf report status line
Em Fri, Apr 26, 2019 at 04:44:06PM +0200, Jiri Olsa escreveu:
> On Fri, Apr 26, 2019 at 11:16:07AM -0300, Arnaldo Carvalho de Melo wrote:
>
> SNIP
>
> > > util/session.c: In function ‘perf_session__process_events’:
> > > util/session.c:1936:7: error: ‘skip’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
> > > err = skip;
> > > ~~~~^~~~~~
> > > util/session.c:1874:6: note: ‘skip’ was declared here
> > > s64 skip;
> > > ^~~~
> > > cc1: all warnings being treated as errors
> > > mv: cannot stat '/tmp/build/perf/util/.session.o.tmp': No such file or directory
> > > make[4]: *** [/home/acme/git/perf/tools/build/Makefile.build:96: /tmp/build/perf/util/session.o] Error 1
> > > make[3]: *** [/home/acme/git/perf/tools/build/Makefile.build:139: util] Error 2
> > > make[2]: *** [Makefile.perf:559: /tmp/build/perf/perf-in.o] Error 2
> > > make[1]: *** [Makefile.perf:215: sub-make] Error 2
> > > make: *** [Makefile:110: install-bin] Error 2
> > > make: Leaving directory '/home/acme/git/perf/tools/perf'
> >
> > So, here is your patch:
> >
> > diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> > index b17f1c9bc965..e89716175588 100644
> > --- a/tools/perf/util/session.c
> > +++ b/tools/perf/util/session.c
> > @@ -1930,10 +1930,10 @@ reader__process_events(struct reader *rd, struct perf_session *session,
> >
> > if (size < sizeof(struct perf_event_header) ||
> > (skip = rd->process(session, event, file_pos)) < 0) {
> > - pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
> > + pr_err("%#" PRIx64 " [%#x]: failed to process type: %d [%s]\n",
> > file_offset + head, event->header.size,
> > - event->header.type);
> > - err = -EINVAL;
> > + event->header.type, strerror(-skip));
> > + err = skip;
> > goto out;
> > }
> >
> > [acme@quaco perf]$
> >
> > What happens if (size < sizeof(struct perf_event_header)) is true? size
> > will have an undefined value, so the right thing is to have this patch
> > on top of yours, so that err get, as before, set to -EINVAL when the
> > size is less than the perf_event_header sizeof:
>
> I'd think you need to squash your change with the original patch
> for the bisecting sake, right?

Yes, that is what I did.

> > +++ b/tools/perf/util/session.c
> > @@ -1928,6 +1928,8 @@ reader__process_events(struct reader *rd, struct perf_session *session,
> >
> > size = event->header.size;
> >
> > + skip = -EINVAL;
> > +
> > if (size < sizeof(struct perf_event_header) ||
> > (skip = rd->process(session, event, file_pos)) < 0) {
> > pr_err("%#" PRIx64 " [%#x]: failed to process type: %d [%s]\n",
> >
> > ---
> >
> > With two Reviewed-by tags, I jumped to quickly at applying, please
> > compile test next time guys ;-) :-)

> ugh.. need to slow down, this is happening too often now :-\

Right, I'll test build everything, and I do like reviewers, who don't?
Its just that when I see reviewed-by tags I end up relaxing a bit :-)

- Arnaldo

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