linux-kernel - Re: thread leader death under strace (was Re: [PATCH 03/10] ptrace: implement PTRACE

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Message-Id: <201106032010.03947.vda.linux@googlemail.com>
Date:	Fri, 3 Jun 2011 20:10:03 +0200
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>, indan@....nu,
	bdonlan@...il.com, linux-kernel@...r.kernel.org,
	jan.kratochvil@...hat.com, akpm@...ux-foundation.org
Subject: Re: thread leader death under strace (was Re: [PATCH 03/10] ptrace: implement PTRACE_SEIZE)

On Friday 03 June 2011 17:29, Oleg Nesterov wrote:
> > > > > thread_leader(void *unused)
> > > > > {
> > > > > 	/* malloc gives sufficiently aligned buffer.
> > > > > 	 * long buf[] does not! (on ia64).
> > > > > 	 */
> > > > > 	clone2(thread1, malloc(16 * 1024), 16 * 1024, 0
> > > >
> > > > Probably because of this clone2.
> >
> > This seems to be not a problem (it is defined to clone()).
> 
> Doesn't matter.
> 
> Unlike pthread_create() which uses CLONE_SETTLS, this doesn't setup
> the tls area, and I assume you used -lpthread. In this case it is clear
> why raise() doesn't work, pt-raise.c thinks that THREAD_GETMEM(tid)
> should always work.

I don't link against pthread.

-- 
vda
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