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Sebastian Andrzej Siewior
39def6d250
The commit cited below should not have been merged. It attemted to fix an existing problem ansd thereby introduced new problems by keeping the pi_state in state Q_REQUEUE_PI_IN_PROGRESS and leaking it. Based on the commit description the intention was to handle the case when task_blocks_on_rt_mutex() returns -EDEADLK and the following remove_waiter() dereferences the NULL pointer in waiter->task. That is already handled by Davidlohr in commit40a25d59e8("locking/rtmutex: Skip remove_waiter() when waiter is not enqueued") and requires no further acting. Revert the commit breaking the "waiter == owner" case again. Fixes:74e144274a("futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock") Reported-by: Michael Bommarito <[email protected]> Signed-off-by: Sebastian Andrzej Siewior <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Cc: [email protected] Link: https://patch.msgid.link/[email protected] Closes: https://lore.kernel.org/all/[email protected]