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Normally sys_rt_sigreturn() restores the old current->blocked which was changed by handle_signal(), and unblocking is always fine. But the debugger or application itself can change frame->uc_sigmask and thus we need set_current_blocked()->retarget_shared_pending(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Matt Fleming <matt.fleming@linux.intel.com> Acked-by: Tejun Heo <tj@kernel.org>