Thomas Gleixner wrote:
quoted text
> We have to disable the complete PI/robust functionality for those
> archs, which do not implement futex_atomic_cmpxchg_inatomic(). The
> code in question relies on a valid implementation and does not expect
> -ENOSYS, which is returned by the stub implementation in
> asm-generic/futex.h
>
> Pointed out by: Mikael Pettersson, Riku Voipio and Adrian Bunk
>   
Original credits for finding this issue belong to Lennert Buytenhek.
quoted text
> This patch is intended for easy backporting and needs to be cleaned up
> further for current mainline.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Acked-by: Ingo Molnar <mingo@elte.hu>
Looks good for me and kernel no longer deadlocks with this patch!
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