On Mon, Jul 07, 2014 at 12:20:20PM +0200, Jiri Olsa wrote: > On Mon, Jul 07, 2014 at 11:04:28AM +0200, Peter Zijlstra wrote: > > On Wed, Jun 25, 2014 at 08:44:35PM +0200, Jiri Olsa wrote: > > > From: Jiri Olsa <[email protected]> > > > > > > While iterating siblings in perf_output_read_group we could > > > race with addition and removal of sibling in perf_group_attach > > > and perf_group_detach respective. > > > > So why would anybody do this? > > the test program from 0/1 email hangs up my server > but no standard reason AFAICS > > I've got soft lockup, sometimes ended up with unkillable perf process > also few total server hangs
OK, so that's useful information to have in a Changelog ;-) Not immediately obvious how that can happen though. I can see the output getting scrambled.
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