powerpc: step-jump-cont failure (Was: [PATCH] utrace: don't set ->ops = utrace_detached_ops lockless)

[Oleg Nesterov]

On 12/06, CAI Qian wrote:
>
> > Not I am aware of. I will re-install this machine to have a probably
> > clearer environment, and let you know the outcome shortly.
>
> It is the same there. I have extended the reservation for the next 3 days.

OK, thank you.

At least we know that this problem was not caused by utrace/ptrace,
unpatched kernel fails too. I was greatly confused because I thought
it was broken by the recent change in utrace.c

I'll try to investigate, but currently I am all confused, and I suspect
we have some user-space issues. If only I knew something about ppc...

Ananth, could you please confirm once again that step-jump-cont (from
ptrace-tests testsuite) not fail on your machine? If yes, please tell
me the version of glibc/gcc. Is PTRACE_GETREGS defined on your machine?

Oleg.