Re: [PATCH] powerpc TLF_RESTORE_SIGMASK

From: Andrew Morton
Date: Thu Apr 10 2008 - 21:51:36 EST


On Thu, 10 Apr 2008 18:36:35 -0700 (PDT) Roland McGrath <roland@xxxxxxxxxx> wrote:

> > This crashes my powerpc mac g5.
>
> It worked fine on mine.
>
> > It happens after the boot, during the first login-over-ssh.
>
> Mine did lots of stuff fine.
>
> > This is with most of the rest of the -mm poopile applied. i386 and x86_64
> > seem OK.
>
> I had only tested with Linus's tree plus the small handful of post-2.6.25
> cleanup patches I've posted in the last few weeks. To be precise it was
> 9597362d354f8655ece324b01d0c640a0e99c077 plus several of my cleanup patches
> (that are probably all in -mm, but I'm not sure off hand).
>
> I'd rebased my tree today to 783e391b7b5b273cd20856d8f6f4878da8ec31b3
> anyway. I just tried the new kernel with the sigmask cleanups and only
> a few other patches, and have no problems.
>
> The details of your crash make it look pretty unrelated to this code.
> Off hand I would guess that it's some other bug from other -mm patches
> that just happens only to bite you on powerpc. If the crash is not
> intermittent and you bisected it to this one change, then I am at a
> loss to see what might be happening. I'd have to leave it to Paul et
> al to figure out if there is some strange powerpc juju going on.

It's 100% repeatable and I bisected it to this change.

I expect you could repeat it by applying it to
http://userweb.kernel.org/~akpm/mmotm/ (or to -rc6-mm2, if I ever manage to
get it to boot on something) and using
http://userweb.kernel.org/~akpm/config-g5.txt
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