2.6.37-stable review patch. If anyone has any objections, please let us know.
------------------ From: Peter Zijlstra <[email protected]> commit 38b435b16c36b0d863efcf3f07b34a6fac9873fd upstream. When destroying inherited events, we need to destroy groups too, otherwise the event iteration in perf_event_exit_task_context() will miss group siblings and we leak events with all the consequences. Reported-and-tested-by: Vince Weaver <[email protected]> Signed-off-by: Peter Zijlstra <[email protected]> LKML-Reference: <1300196470.2203.61.camel@twins> Signed-off-by: Ingo Molnar <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- kernel/perf_event.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -5863,17 +5863,20 @@ __perf_event_exit_task(struct perf_event struct perf_event_context *child_ctx, struct task_struct *child) { - struct perf_event *parent_event; + if (child_event->parent) { + raw_spin_lock_irq(&child_ctx->lock); + perf_group_detach(child_event); + raw_spin_unlock_irq(&child_ctx->lock); + } perf_event_remove_from_context(child_event); - parent_event = child_event->parent; /* - * It can happen that parent exits first, and has events + * It can happen that the parent exits first, and has events * that are still around due to the child reference. These - * events need to be zapped - but otherwise linger. + * events need to be zapped. */ - if (parent_event) { + if (child_event->parent) { sync_child_event(child_event, child); free_event(child_event); } _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
