On Tue, Oct 06, 2020 at 06:39:44AM +0000, Song Bao Hua (Barry Song) wrote: SNIP
> > > Andi, thanks! Could you share the link or the commit ID? I'd like to take > > > a > > look at the fix. > > > I could still reproduce this issue in the latest linus' tree and I didn't > > > find any > > commit > > > related to this issue in linux-next and tip/perf/core. > > > > I think Andi was referring to this discussion which is not merged yet: > > > > https://lore.kernel.org/lkml/20200922031346.15051-2-liwei...@huawei.co > > m/ > > > > I suggested a patch at the end. Can you please try it? > > I tried the patch you suggested. > > diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c > index 2208444ecb44..cfcdbd7be066 100644 > --- a/tools/lib/perf/evlist.c > +++ b/tools/lib/perf/evlist.c > @@ -45,6 +45,9 @@ static void __perf_evlist__propagate_maps(struct > perf_evlist *evlist, > if (!evsel->own_cpus || evlist->has_user_cpus) { > perf_cpu_map__put(evsel->cpus); > evsel->cpus = perf_cpu_map__get(evlist->cpus); > + } else if (!evsel->system_wide && perf_cpu_map__empty(evlist->cpus)) { > + perf_cpu_map__put(evsel->cpus); > + evsel->cpus = perf_cpu_map__get(evlist->cpus); > } else if (evsel->cpus != evsel->own_cpus) { > perf_cpu_map__put(evsel->cpus); > evsel->cpus = perf_cpu_map__get(evsel->own_cpus); > > it did fix the crash I have seen on arm64. I'd prefer you put the below fixes > tag in the commit log. > Fixes: 7736627b865d ("perf stat: Use affinity for closing file descriptors") > Perf stat began to crash from v5.4 kernel, so the fix should be backported to > stable trees. awesome.. Namhyung, could you please send full patch? thanks, jirka
