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Compile tested. task_struct->signal is not protected by RCU, the code is bogus. Change the code to take ->siglock to pin ->signal. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Arve Hjønnevåg <arve@android.com> Cc: Brian Swetland <swetland@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>