perf: Fix check before add_event_to_groups() in perf_group_detach()
Events should only be added to a groups rb tree if they have not been removed from their context by list_del_event(). Since remove_on_exec made it possible to call list_del_event() on individual events before they are detached from their group, perf_group_detach() should check each sibling's attach_state before calling add_event_to_groups() on it. Fixes: 2e498d0a ("perf: Add support for event removal on exec") Signed-off-by:Budimir Markovic <markovicbudimir@gmail.com> Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/ZBFzvQV9tEqoHEtH@gentoo
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