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The core ptrace access checking routine holds a task lock, and when reporting a failure, Yama takes a separate task lock. To avoid a potential deadlock with two ptracers taking the opposite locks, do not use get_task_comm() and just use ->comm directly since accuracy is not important for the report. Reported-by: Fengguang Wu <[email protected]> Suggested-by: Oleg Nesterov <[email protected]> CC: [email protected] Signed-off-by: Kees Cook <[email protected]> Acked-by: John Johansen <[email protected]> Signed-off-by: James Morris <[email protected]>