linux-kernel - Re: Linux 3.11-rc4

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Message-ID: <20130805171142.GA6978@redhat.com>
Date:	Mon, 5 Aug 2013 19:11:42 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Felipe Contreras <felipe.contreras@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 3.11-rc4

On 08/05, Felipe Contreras wrote:
>
> On Mon, Aug 5, 2013 at 9:39 AM, Oleg Nesterov <oleg@...hat.com> wrote:
> >
> > Hmm. It should not crash under strace... please see below.
> >
> >> 953   ptrace(PTRACE_ATTACH, 1035, 0, 0) = -1 EPERM (Operation not permitted)
> >
> > OK, so it actually uses ptrace ;)
> >
> > PTRACE_ATTACH fails because this child is already traced by strace, I guess.
> >
> > So does Starcraft crash this way? Or does it fail in some other way?
>
> It's crashing just the same.

But then it is not clear how fab840f can make any difference.

wine can not use ptrace when it runs after "strace -f". But, to remind,
I know nothing about wine. Perhaps wine uses some daemons which actually
run/ptrace the workload?

> > And just in case... perhaps wine does some logging too?
>
> Yeah, but there doesn't seem to be anything interesting:
>
> http://bugs.winehq.org/attachment.cgi?id=45489

at least there is certainly nothing interesting for me since
I don't understand this ;) Thanks.

Oleg.

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