linux-kernel - Re: Linux 3.11-rc4

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Date:	Mon, 5 Aug 2013 12:40:46 -0500
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 3.11-rc4

On Mon, Aug 5, 2013 at 12:11 PM, Oleg Nesterov <oleg@...hat.com> wrote:
> 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.

Yeah, it's very strange.

> 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?

There's this thing called wineserver, I'm not exactly sure how it would affect.

But I found this:

http://askubuntu.com/questions/146160/what-is-the-ptrace-scope-workaround-for-wine-programs-and-are-there-any-risks

Would it be possible to just revert that patch for v3.11, and fix it later?

-- 
Felipe Contreras
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