Re: futex_wake_op deadlock?

[David Daney <ddaney@avtrex.com>]

Ralf Baechle wrote:

> Notice the branch at the end of the fixup code, it goes back to the
> SC instruction.  The SC instruction took an exception so it will not have
> changed $1 so the loop will continue endless unless by coincidence the
> value to be stored from $1 happened to be zero.
>
> Obviously this one was MIPS specific and may hit all supported ABIs.  So
> my initial suspicion this might be the issue David Miller recently
> discovered in the binary compat code isn't true.  And it's a local DoS
> probably for all of 2.6.16 and up.
I mostly similar code is in 2.6.15, so I think it is effected as well. 
2.6.12 on the other hand doesn't seem to have futex.h
David Daney